Shifting the sands of RansomHub’s EDRKillShifter

ESET researchers have a look again on the important adjustments within the ransomware ecosystem in 2024 and concentrate on the newly emerged and presently dominating ransomware-as-a-service (RaaS) gang, RansomHub. We share beforehand unpublished insights into RansomHub’s affiliate construction and uncover clear connections between this newly emerged big and well-established gangs Play, Medusa, and BianLian.

We additionally emphasize the rising risk of EDR killers, unmasking EDRKillShifter, a customized EDR killer developed and maintained by RansomHub. We have now noticed a rise in ransomware associates utilizing code derived from publicly out there proofs of idea, whereas the set of drivers being abused is essentially fastened.

Lastly, based mostly on our observations following the law-enforcement-led Operation Cronos and the demise of the notorious BlackCat gang, we provide our insights into methods to help on this intensive battle in opposition to ransomware.

Key factors of this blogpost:

• We found clear hyperlinks between the RansomHub, Play, Medusa, and BianLian ransomware gangs.
• We achieved this by following the path of tooling that RansomHub provides its associates.
• We doc further findings about EDRKillShifter, correlating our observations with RansomHub’s public exercise.
• We provide insights into the rising risk of EDR killers, their anatomy, and their function within the ransomware world.

Overview

The battle in opposition to ransomware reached two milestones in 2024: LockBit and BlackCat, previously the highest two gangs, dropped out of the image. And for the primary time since 2022, recorded ransomware funds dropped, specifically by a beautiful 35% regardless of reverse expectations in the midst of the yr. Then again, the recorded variety of victims posted on devoted leak websites (DLSs) elevated by roughly 15%.

An enormous a part of this enhance is because of RansomHub, a brand new RaaS gang that emerged across the time of Operation Cronos. On this blogpost, we glance in depth at RansomHub and exhibit how we leveraged to our benefit the best way associates use RansomHub’s tooling, permitting us to attract connections between RansomHub and its rivals, together with well-established ones like Play, Medusa, and BianLian.

All through this blogpost, we consult with entities forming the ransomware-as-a-service mannequin as follows:

• Operators, who develop the ransomware payload, keep the DLS, and provide providers to associates, often for a month-to-month price and a share of the ransom fee (sometimes 5–20%).
• Associates, who hire ransomware providers from operators, and deploy the encryptors to victims’ networks and generally additionally follow information exfiltration.

The rise of RansomHub

RansomHub introduced its first sufferer on its DLS (see Determine 1) on February 10^th, 2024, 10 days earlier than the general public announcement of Operation Cronos. Whereas the gang’s rise was gradual, it was additionally constant, and when – in April 2024 – RansomHub achieved probably the most sufferer postings of all lively ransomware teams (disregarding LockBit posting fakes), it was clear that this was a gang to maintain a detailed eye on. Since then, RansomHub has dominated the ransomware scene.

To additional exhibit how harmful RansomHub is, let’s evaluate it to LockBit. Determine 2 exhibits the each day cumulative sum (on the y-axis) of recent victims posted on the DLS of LockBit vs. RansomHub, ranging from RansomHub’s look in February 2024.

As you may clearly see, whereas RansomHub began asserting victims extra slowly, almost 9 months later the gang was capable of accumulate extra victims because it began than LockBit, and that development continues to this present day. Contemplating that each BlackCat and LockBit suffered big blows proper across the time RansomHub emerged, we will confidently assume that many expert associates migrated to RansomHub; Notchy, the BlackCat affiliate who stole greater than 4 TB of information from Change Healthcare, is only one publicly recognized instance.

Determine 3 exhibits the ransom notice that RansomHub associates go away on their victims’ machines.

We're the RansomHub. Your organization Servers are locked and Knowledge has been taken to our servers. That is critical.  Excellent news: - your server system and information will probably be restored by our Decryption Device, we assist trial decryption to show that your information could be decrypted; - for now, your information is secured and safely saved on our server; - no one on the earth is conscious concerning the information leak out of your firm besides you and RansomHub workforce; - we offer free trial decryption for information smaller than 1MB. If anybody claims they'll decrypt our information, you may ask them to attempt to decrypt a file bigger than 1MB. FAQs: Who we're? - Regular Browser Hyperlinks: https://ransomxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion.ly/ - Tor Browser Hyperlinks: http://ransomxifxwc5eteopdobynonjctkxxvap77yqifu2emfbecgbqdw6qd.onion/ Need to go to authorities for defense? - Looking for their assistance will solely make the state of affairs worse,They are going to attempt to forestall you from negotiating with us, as a result of the negotiations will make them look incompetent,After the incident report is handed over to the federal government division, you may be fined ,The federal government makes use of your positive to reward them.And you'll not get something, and besides you and your organization, the remainder of the folks will neglect what occurred!!!!! Suppose you may deal with it with out us by decrypting your servers and information utilizing some IT Answer from third-party "specialists"? - they'll solely make important harm to your whole information; each encrypted file will probably be corrupted eternally. Solely our Decryption Device will make decryption assured;   Do not go to restoration corporations, they're primarily simply middlemen who will earn a living off you and cheat you.  - We're properly conscious of instances the place restoration corporations inform you that the ransom worth is 5 million {dollars}, however the truth is they secretly negotiate with us for 1 million {dollars}, in order that they earn 4 million {dollars} from you. Should you approached us instantly with out intermediaries you'll pay 5 occasions much less, that's 1 million {dollars}. Suppose your accomplice IT Restoration Firm will do information restoration?  - no they won't do restoration, solely take 3-4 weeks for nothing; in addition to your whole information is on our servers and we will publish it at any time;    in addition to ship the data concerning the information breach out of your firm servers to your key companions and purchasers, rivals, media and youtubers, and so forth.    These actions from our aspect in direction of your organization may have irreversible detrimental penalties for what you are promoting repute. You do not care in any case, since you simply do not need to pay?  - We are going to make you enterprise cease eternally by utilizing all of our expertise to make your companions, purchasers, staff and whoever cooperates together with your firm change their minds by having no alternative however to avoid your organization.    Consequently, in midterm you'll have to shut what you are promoting.  So lets get straight to the purpose. What do we provide in alternate in your fee: - decryption and restoration of all of your techniques and information inside 24 hours with assure; - by no means inform anybody concerning the information breach out out of your firm; - after information decryption and system restoration, we'll delete your whole information from our servers eternally; - present priceless advising in your firm IT safety so nobody can assault your once more.``` Now, with a view to begin negotiations, you must do the next:  - set up and run 'Tor Browser' from https://www.torproject.org/obtain/ - use 'Tor Browser' open http://ubfofxonwdb32wpcmgmcpfos5tdskfizdft6j54l76x3nrwu2idaigid.onion/ - enter your Consumer ID: [REDACTED] * don't leak your ID or you may be banned and can by no means have the ability to decrypt your information. There will probably be no unhealthy information to your firm after profitable negotiations for either side. However there will probably be loads of these unhealthy information if case of failed negotiations, so do not take into consideration methods to keep away from it. Simply concentrate on negotiations, fee and decryption to make your whole issues solved by our specialists inside 1 day after fee acquired: servers and information restored, the whole lot will work good as new. ************************************************

Determine 3. RansomHub ransom notice

Recruiting part

Simply as any rising RaaS gang, RansomHub wanted to draw associates, and since there’s power in numbers, the operators weren’t very choosy. The preliminary commercial was posted on the Russian-speaking RAMP discussion board on February 2^nd, 2024, eight days earlier than the primary victims had been posted. There are some things to notice concerning the preliminary announcement:

• Associates can obtain ransoms with their very own pockets after which afterward pay the operator.
• Associates get to maintain 90% of the ransom.
• The encryptor is obfuscated and helps Home windows, Linux, and ESXi platforms.
• RansomHub provides varied methods to enter its RaaS program:
  • Suggestion by an present affiliate.
  • Proof of repute.
  • Proof of previous RaaS cooperation.
  • Paying a deposit that’s returned after first profitable fee.
• Attacking Commonwealth of Impartial States, Cuba, North Korea, and China is prohibited.
• Most well-liked communication is over qTox utilizing the ID 4D598799696AD5399FABF7D40C4D1BE9F05D74CFB311047D7391AC0BF64BED47B56EEE66A528.

Ensures like receiving ransom fee on to the affiliate’s pockets and preserving a beneficiant 90% actually sound promising, particularly within the chaos following the BlackCat and LockBit disruptions. Moreover, the entry barrier may be very low, permitting even low-skilled associates to attempt their luck.

It’s also value mentioning that RansomHub’s encryptor is just not written from scratch, however based mostly on repurposed code from Knight, a once-rival ransomware gang that offered its supply code in February 2024. The associates request the encryptor (usually referred to as a locker by RaaS operators) by the net panel supplied by RansomHub (as is typical for RaaS gangs); the part liable for producing the encryptor is often known as a builder. As a result of info such because the distinctive sufferer ID is hardcoded within the encryptor, an affiliate must request a brand new one for each sufferer. RansomHub’s builder provides a further layer of safety to its encryptors, a 64-character password, with out which the encryptor doesn’t work. This password is exclusive for every pattern, generated by the builder, and recognized solely to the affiliate who requested the encryptor.

On June 21^st, 2024, RansomHub operators modified the affiliate guidelines in response to an alleged breach by safety researchers. In response, the operator not allowed vouching by present members as ample and strictly required a US$ 5,000 deposit for aspiring associates. This was the final noteworthy message from the RansomHub operators. Nevertheless, between the preliminary announcement and this rule change, yet another vital occasion occurred, which we dive into within the subsequent part.

Increasing the arsenal – EDRKillShifter

On Could 8^th, 2024, the RansomHub operators made a big replace – they launched their very own EDR killer, a particular kind of malware designed to terminate, blind, or crash the safety product put in on a vicim’s system, sometimes by abusing a weak driver.

RansomHub’s EDR killer, named EDRKillShifter by Sophos, is a customized device developed and maintained by the operator. EDRKillShifter is obtainable to RansomHub associates by the net panel, identical because the encryptor; it too is protected by a 64-character password. Performance-wise, it’s a typical EDR killer focusing on a big number of safety options that the RansomHub operators anticipate finding defending the networks they goal to breach. A notable distinction lies within the code safety – the password protects shellcode that acts as a center layer of the killer’s execution. With out the password, safety researchers can neither retrieve the checklist of focused course of names nor the abused weak driver.

Sophos in all probability selected “shifter” within the title to mirror the truth that the abused driver is just not all the time the identical – at the least two totally different weak drivers (abused by different recognized EDR killers too) had been noticed. We dive extra in depth into EDRKillShifter and different EDR killers within the EDR killers on the rise part.

The choice to implement a killer and provide it to associates as a part of the RaaS program is uncommon. Associates are sometimes on their very own to seek out methods to evade safety merchandise – some reuse present instruments, whereas extra technically oriented ones modify present proofs of idea or make the most of EDR killers out there as a service on the darkish internet. Evidently, ransomware associates thought this was a good suggestion, as a result of quickly after the announcement, ESET researchers noticed a steep enhance in using EDRKillShifter, and never completely in RansomHub instances, as we exhibit within the subsequent part.

Roughly a month after EDRKillShifter’s announcement, on June 3^rd, 2024, RansomHub operators posted yet one more replace, stating that they improved EDRKillShifter. ESET telemetry exhibits that some associates deployed this up to date model solely 4 days later.

Leveraging EDRKillShifter

ESET researchers took benefit of the extensive recognition that EDRKillShifter gained upon its launch to increase our analysis. We had been capable of leverage its utilization to affiliate RansomHub associates with the a number of rival gangs that additionally they work for, in addition to to retrieve clearer inside versioning of this EDR killer.

Linking associates to rival gangs

The distinction between RansomHub’s encryptor and EDRKillShifter is that there is no such thing as a purpose for associates to construct a brand new pattern of EDRKillShifter for each intrusion (except there’s a main replace) – which is strictly what allowed us to uncover certainly one of RansomHub’s associates working for 3 rival gangs – Play, Medusa, and BianLian.

These three gangs differ considerably:

• BianLian focuses totally on extortion-only assaults, with no RaaS program providing on its DLS.
• Medusa doesn’t provide a RaaS program on its DLS both, however advertises its RaaS program on the RAMP underground discussion board.
• Play strictly denies ever operating a RaaS program on its DLS.

Discovering a hyperlink between RansomHub and Medusa is just not that shocking, as it is not uncommon data that ransomware associates usually work for a number of operators concurrently. Nevertheless, we didn’t anticipate well-established gangs working underneath the closed RaaS mannequin (that means that they don’t actively search for new recruits and their partnerships are based mostly on long-term mutual belief) to type alliances with RansomHub so shortly. Different well-established gangs, along with BianLian and Play, additionally function underneath the closed RaaS mannequin – the latest BlackBasta leak supplied distinctive perception into the inside workings of such teams.

One solution to clarify Play and BianLian gaining access to EDRKillShifter is that they employed the identical RansomHub affiliate, which is unlikely given the closed nature of each gangs. One other, extra believable clarification is that trusted members of Play and BianLian are collaborating with rivals, even newly emerged ones like RansomHub, after which repurposing the tooling they obtain from these rivals in their very own assaults. That is particularly attention-grabbing, since such closed gangs sometimes make use of a quite constant set of core instruments throughout their intrusions. Earlier than diving into the specifics of the found overlaps, let’s briefly introduce the modus operandi of the Play gang.

Play’s modus operandi

The Play gang posted the primary victims to its DLS on November 26^th, 2022; the gang has proven regular development since then. In April 2024, Play made it to the highest three most lively ransomware gangs on the scene and constantly remained within the prime 10 for the entire yr. The gang posts 25 new victims every month, on common, specializing in SMBs, hinting that the gang has at the least a number of skilled, loyal associates. Just lately, Play has been linked to the North Korea-aligned group Andariel.

As anticipated from a closed RaaS gang, most instances involving the Play encryptor present similarities. Sometimes, in such intrusions:

• the encryptors are saved in %PUBLICpercentMusic.exe,
• SystemBC is utilized for payload supply and serves as a proxy,
• Grixba, a customized community scanner, is commonly used, and
• further tooling is commonly downloaded instantly from an IP deal with.

The rest of the assault sometimes employs a large arsenal of instruments, in addition to living-off-the-land strategies.

The puzzle

Let’s look in depth on the hyperlinks we found. We emphasize first crucial ones in Determine 4 after which dive into the small print of every of the intrusions. We consider with excessive confidence that every one these assaults had been carried out by the identical risk actor, working as an affiliate of the 4 ransomware gangs proven in Determine 4. We’re not monitoring this risk actor underneath a devoted title at this level, however for comfort, we’ll consult with this risk actor as QuadSwitcher.

As you may see in Determine 4, there are a complete of 5 intrusions from 4 totally different ransomware gangs interlinked by:

• two EDRKillShifter samples (SHA-1: BF84712C5314DF2AA851B8D4356EA51A9AD50257 and 77DAF77D9D2A08CC22981C004689B870F74544B5),
• the payload supply server 45.32.206[.]169 internet hosting EDRKillShifter and WKTools (a utility to discover and modify the Home windows kernel, utilized in many Play intrusions), and
• SystemBC with C&C server 45.32.210[.]151.

The next sections go into the person intrusions in additional element.

RansomHub

In July 2024, QuadSwitcher deployed the RansomHub encryptor together with EDRKillShifter (SHA-1: BF84712C5314DF2AA851B8D4356EA51A9AD50257) to a producing firm in Western Europe and an automotive firm in Central Europe.

In August, QuadSwitcher compromised a governmental establishment in North America utilizing PuTTY, and shortly after Rclone. They proceeded by putting in AnyDesk and defending it with a password through a PowerShell script, anydes.ps1 (a part of the Conti leaks). Making an attempt to evade the safety answer, the risk actor deployed EDRKillShifter (SHA-1: BF84712C5314DF2AA851B8D4356EA51A9AD50257) and TDSSKiller.

BianLian

On the finish of July 2024, QuadSwitcher compromised an organization within the authorized sector in North America. Throughout that intrusion, the risk actor dumped the Energetic Listing by executing

powershell “ntdsutil.exe ‘ac i ntds’ ‘ifm’ ‘create full c:temp1’ q q”,

deployed AnyDesk through the identical set up script from the Conti leaks, and used Superior IP Scanner to scan the community. Six days later, the attacker put in the ScreenConnect and Ammyy Admin distant monitoring and administration (RMM) instruments and deployed EDRKillShifter (SHA-1: BF84712C5314DF2AA851B8D4356EA51A9AD50257). After virtually a month of no exercise, the attacker returned and downloaded two payloads from http://45.32.206[.]169/:

• WKTools.exe, the WKTools, utility usually utilized by Play
• Killer.exe, an occasion of EDRKillShifter (SHA-1: 77DAF77D9D2A08CC22981C004689B870F74544B5)

Moreover, QuadSwitcher deployed SystemBC utilizing 45.32.210[.]151 as its C&C server, and a signature BianLian backdoor with C&C server 92.243.64[.]200:6991 from http://149.154.158[.]222:33031/win64_1.exe. The sufferer was later introduced on BianLian’s DLS.

Play

In early August 2024, QuadSwitcher compromised a producing firm in North America. They deployed SystemBC with C&C 45.32.210[.]151, EDRKillShifter (SHA-1: 77DAF77D9D2A08CC22981C004689B870F74544B5), and WKTools, downloaded from http://45.32.206[.]169/WKTools.exe. In the end, the risk actor deployed the Play encryptor.

Medusa

On the finish of August 2024, QuadSwitcher compromised a expertise firm in Western Europe, downloading PuTTY from http://130.185.75[.]198:8000/plink.exe utilizing certutil.exe, adopted by utilizing Course of Explorer and EDRKillShifter (SHA-1: BF84712C5314DF2AA851B8D4356EA51A9AD50257). The risk actor additionally downloaded MeshAgent from http://79.124.58[.]130/dl/git.exe, additionally through certutil.exe. The sufferer was later introduced on Medusa’s DLS.

The puzzle – conclusion

In addition to the hyperlinks summarized in Determine 4, there are TTPs that the majority resemble typical Play intrusions. In three of the instances, further malware and instruments had been downloaded from a root folder of a server accessed through an IP deal with utilizing HTTP and QuadSwitcher additionally used SystemBC, commodity malware closely utilized by the Play gang. These hyperlinks lead us to consider QuadSwitcher is expounded to Play the closest.

Moreover, QuadSwitcher has entry to at the least two EDRKillShifter samples, compiled two months aside, signaling the risk actor had prolonged entry to RansomHub’s tooling.

Reconstructing EDRKillShifter improvement timeline

In September 2024, ESET researchers documented a case the place CosmicBeetle, an immature ransomware risk actor utilizing its personal signature encryptor, ScRansom, and the leaked LockBit 3.0 builder, turned an affiliate of RansomHub. Notice that CosmicBeetle is just not a gang, however a person distributing and creating varied ransomware. Following the publication of our findings, we noticed CosmicBeetle additional make the most of EDRKillShifter throughout:

• a RansomHub assault in opposition to a hospitality firm in South America in August 2024,
• a pretend LockBit assault in opposition to an automotive firm in Central Europe in August 2024,
• a pretend LockBit assault in opposition to a producing firm in East Asia in September 2024, and
• an assault with no encryptor deployed in opposition to an unknown firm within the Center East in January 2025.

Different immature ransomware associates had been noticed utilizing EDRKillShifter earlier than deploying their customized encryptors (usually created just by utilizing the leaked LockBit 3.0 builder) as properly. This exhibits one weak point of RansomHub – in its greed to develop as shortly as attainable, it wasn’t very choosy about its associates. Consequently, it was, by its personal admission, breached by safety researchers in June 2024. Moreover, immature associates have a tendency to depart considerably extra trails, which enabled us to be taught extra about each them and RansomHub.

Within the blogpost about CosmicBeetle, we talked about EDRKillShifter being deployed from an uncommon path C:UsersAdministratorMusic1.0.8.zip. Within the following months, a number of different immature associates left comparable trails that enabled us to partially reconstruct EDRKillShifter’s versioning, demonstrated in Desk 1. The VERSIONINFO column refers to EDRKillShifter’s model as listed in its VERSIONINFO useful resource, whereas the Deployment path refers back to the model talked about within the path found by ESET telemetry.

Desk 1. EDRKillShifter versioning

Compilation date	VERSIONINFO	Deployment path
2024-05-01	1.2.0.1	N/A
2024-06-06	1.2.0.1	1.0.7 / 1.0.8
2024-06-07	1.6.0.1	2.0.1
2024-07-10	2.6.0.1	2.0.4
2024-07-24	2.6.0.1	2.0.5

Following July 2024, there was solely a single very generic replace from the RansomHub operator posted on RAMP, correlating with our not seeing new variations of EDRKillShifter within the wild. Reconstructing the event timeline of EDRKillShifter additionally allowed us to identify these improvement practices:

• The InternalName property of the model information useful resource being both Config.exe or Loader.exe.
• The OriginalName property of the model information useful resource all the time being Loader.exe.
• The deployment filename various, mostly being Killer.exe, Magic.exe, or Loader.exe.
• The title of the argument accepting the 64-character-long password being named both move or key.

EDR killers on the rise

EDRKillShifter shortly gained recognition amongst ransomware associates, and as we simply demonstrated, they don’t use it completely in RansomHub intrusions. Nevertheless, it’s not the one EDR killer on the market; the truth is, ESET researchers have noticed a rise within the number of EDR killers utilized by ransomware associates.

An EDR killer is malware designed to run in a compromised community, to blind, corrupt, crash, or terminate safety options defending the endpoints. The plain objective is to permit easy execution of the ransomware encryptor. Whereas extra immature ransomware associates settle with scripts that merely attempt to terminate a listing of processes, extra refined ones transcend that and use the approach often called Carry Your Personal Susceptible Driver (BYOVD).

EDR killers are an efficient and more and more common addition to ransomware associates’ arsenals. Throughout an intrusion, the objective of the affiliate is to acquire admin or area admin privileges. Ransomware operators have a tendency to not do main updates of their encryptors too usually because of the threat of introducing a flaw that might trigger points, in the end damaging their repute. Consequently, safety distributors detect the encryptors fairly properly, which the associates react to by utilizing EDR killers to “eliminate” the safety answer simply earlier than executing the encryptor.

Anatomy of an EDR killer

Superior EDR killers encompass two components – a consumer mode part liable for orchestration (which we’ll consult with because the killer code) and a authentic, however weak, driver. The execution is often very easy – the killer code installs the weak driver, sometimes embedded in its information or assets, iterates over a listing of course of names, and points a command to the weak driver, leading to triggering the vulnerability and killing the method from kernel mode.

Few drivers, many killers

Sophos documented of their blogpost how totally different builds of EDRKillShifter abuse totally different weak drivers. One of many abused drivers, rentdrv2.sys, can be part of BadRentdrv2, a publicly out there EDR killer. The second, TFSysMon from ThreatFire System Monitor, can be part of TFSysMon-Killer, one other publicly out there PoC. The latter is a part of an even bigger assortment of 4 EDR killer PoCs written in Rust, which we’ve got noticed risk actors reimplement in C++ with out altering a single line of code.

Whereas the Residing Off The Land Drivers challenge gives over 1700 weak drivers, making them a profitable goal for cybercriminals, solely a handful of those drivers are abused by EDR killers – if there’s examined code abusing a vulnerability in certainly one of these drivers, it’s a lot simpler to reuse it with out having to design the code from scratch. Moreover, it permits the EDR killer builders to concentrate on the killer code and its stealthiness.

Grey zone of EDR killers

Authentic instruments are abused by ransomware associates to work as EDR killers, too. Such instruments, just like the GMER rootkit detector and PC Hunter, by their nature require entry to kernel mode and have to carefully examine the internals of the working system. Sadly, additionally they provide a robust performance that may be abused when within the palms of malicious risk actors.

Including EDR killers to RaaS choices

RaaS applications usually don’t present associates solely with encryptors – further instruments and playbooks could also be a part of the bundle. As an example, LockBit supplied Stealbit, a customized information exfiltration device, to its associates, and the Conti leaks and Dispossessor leak disclosed that playbooks, scripts, and know-how are additionally a part of the ransomware gangs’ arsenal.

Including an EDR killer to a RaaS providing appears logical, and RansomHub is just not the one gang doing that. In October 2024, ESET researchers documented that the rising ransomware gang Embargo carried out its personal EDR killer as properly, referred to as MS4Killer, by modifying a publicly out there PoC. On the time of writing: whereas the group listed solely 14 victims on its DLS, it had already invested time and assets into creating its personal EDR killer.

It stays to be seen whether or not EDR killers discover their place in additional gangs’ choices. Nevertheless, this blogpost has additionally demonstrated that researchers might leverage their utilization to cluster associates and uncover new relationships between rival gangs.

Defeating EDR killers

Defending in opposition to EDR killers is difficult. Menace actors want admin privileges to deploy an EDR killer, so ideally, their presence needs to be detected and mitigated earlier than they attain that time.

Whereas stopping the killer code from executing is the most effective strategy, code obfuscation could make this unreliable. Nevertheless, specializing in weak drivers gives further protection choices. ESET considers drivers exploited by EDR killers probably unsafe. Due to this fact, customers, particularly in company environments, ought to be certain that the detection of doubtless unsafe functions is enabled. This may forestall the set up of weak drivers.

Though not frequent, refined risk actors might exploit a weak driver already current on a compromised machine as a substitute of counting on BYOVD. To counter this, having correct patch administration in place is an efficient and important protection technique.

Conclusion

The ransomware ecosystem suffered important blows in 2024. Regardless of the general variety of recorded assaults rising, it mustn’t overshadow the constructive impact of efficiently disrupting or eliminating two ransomware gangs that had been dominating the scene for years.

We will speculate about how a lot the results of regulation enforcement actions decreased ransomware funds, or how the rising consciousness and initiatives just like the Counter Ransomware Initiative are serving to ransomware victims perceive that paying the ransom might not be the easiest way ahead.

What is evident, sadly, is {that a} new refined ransomware group, RansomHub, emerged, used the best ways to draw associates (a lot of whom we consider transitioned from BlackCat and LockBit) in a brief interval, and was shortly capable of climb to the highest of the ladder. Within the foreseeable future, RansomHub will certainly attempt to stay among the many most lively RaaS gangs.

Regulation-enforcement-led disruptions of RaaS operators have proved efficient, sowing mistrust within the RaaS ecosystem. Sadly, 2024 confirmed that associates are capable of regroup pretty shortly. In spite of everything, they’ve sturdy monetary incentives to deploy encryptors to and exfiltrate delicate information from their targets. Though tougher to perform than disruptions, eliminating probably the most lively associates from the image can be efficient as a result of it could possibly forestall new RaaS operators from gaining power as shortly as RansomHub did. We consider that specializing in the associates, particularly by monitoring down their hyperlinks between varied gangs – as demonstrated on this blogpost between RansomHub, Play, Medusa, and BianLian – will in the end result in identification of the associates and their removing from the sport.

For any inquiries about our analysis printed on WeLiveSecurity, please contact us at threatintel@eset.com. 

ESET Analysis provides personal APT intelligence reviews and information feeds. For any inquiries about this service, go to the ESET Menace Intelligence web page.

IoCs

A complete checklist of indicators of compromise and samples could be present in our GitHub repository.

Recordsdata

SHA-1	Filename	Detection	Description
97E13515263002809505DC913B04B49AEB78B067	amd64.exe	WinGo/Kryptik.CV	RansomHub encryptor.
BF84712C5314DF2AA851B8D4356EA51A9AD50257	Loader.exe	Win64/Agent.DVP	EDRKillShifter.
87D0F168F049BEFE455D5B702852FFB7852E7DF6	amd64.exe	WinGo/Kryptik.CV	RansomHub encryptor.
2E89CF3267C8724002C3C89BE90874A22812EFC6	Magic.exe	Win64/Agent.DVP	EDRKillShifter.
3B035DA6C69F9B05868FFE55D7A267D098C6F290	TDSSKiller.exe	Win32/RiskWare.TDSSKiller.A	TDSSKiller.
5ECAFF68D36EC10337428267D05CD3CB632C0444	svchost.exe	WinGo/HackTool.Agent.EY	Rclone.
DCF711141D6033DF4C9149930B0E1078C3B6D156	anydes.ps1	PowerShell/Agent.AEK	Script that deploys and password protects AnyDesk.
E38082AE727AEAEF4F241A1920150FDF6F149106	netscan.exe	Win64/NetTool.ComfortablePerfectNetscan.A	SoftPerfect Community Scanner.
046583DEB4B418A6F1D8DED8BED9886B7088F338	conhost.dll	Win64/Coroxy.J	SystemBC.
3B4AEDAFA9930C19EA889723861BF95253B0ED80	win64_1.exe	Win64/Agent.RA	BianLian backdoor.
460D7CB14FCED78C701E7668C168CF07BCE94BA1	WKTools.exe	Win32/WKTools.A	WKTools.
5AF059C44D6AC8EF92AA458C5ED77F68510F92CD	pfw.exe	Win64/Agent.RA	BianLian backdoor.
67D17CA90880B448D5C3B40F69CEC04D3649F170	1721894530.sys	Win64/RentDrv.A	Susceptible driver utilized by EDRKillShifter.
77DAF77D9D2A08CC22981C004689B870F74544B5	Killer.exe	Win64/Agent.DVP	EDRKillShifter.
180D770C4A55C62C09AAD1FC3412132D87AF5CF6	1.dll	Win64/Coroxy.Ok	SystemBC.
DD6FA8A7C1B3E009F5F17176252DE5ACABD0FB86	d.exe	Win32/Filecoder.PLAY.B	Play encryptor.
FDA5AAC0C0DB36D173B88EC9DED8D5EF1727B3E2	GT_NET.exe	MSIL/Spy.Grixba.A	Grixba.

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MITRE ATT&CK strategies

This desk was constructed utilizing model 16 of the MITRE ATT&CK framework.