The Iranian nation-state group often known as MuddyWater has been attributed to a brand new marketing campaign that has leveraged a compromised electronic mail account to distribute a backdoor known as Phoenix to numerous organizations throughout the Center East and North Africa (MENA) area, together with over 100 authorities entities.
The top objective of the marketing campaign is to infiltrate high-value targets and facilitate intelligence gathering, Singaporean cybersecurity firm Group-IB mentioned in a technical report printed immediately.
Greater than three-fourths of the marketing campaign’s targets embody embassies, diplomatic missions, overseas affairs ministries, and consulates, adopted by worldwide organizations and telecommunications corporations.
“MuddyWater accessed the compromised mailbox by NordVPN (a professional service abused by the risk actor), and used it to ship phishing emails that gave the impression to be genuine correspondence,” mentioned safety researchers Mahmoud Zohdy and Mansour Alhmoud.
“By exploiting the belief and authority related to such communications, the marketing campaign considerably elevated its possibilities of deceiving recipients into opening the malicious attachments.”
The assault chain basically entails the risk actor distributing weaponized Microsoft Phrase paperwork that, when opened, immediate the e-mail recipients to allow macros in an effort to view the content material. As soon as the unsuspecting consumer allows the function, the doc proceeds to execute malicious Visible Primary for Utility (VBA) code, ensuing within the deployment of model 4 of the Phoenix backdoor.
The backdoor is launched by the use of a loader known as FakeUpdate that is decoded and written to disk by the VBA dropper. The loader accommodates the Superior Encryption Customary (AES)-encrypted Phoenix payload.
MuddyWater, additionally known as Boggy Serpens, Cobalt Ulster, Earth Vetala, Mango Sandstorm (previously Mercury), Seedworm, Static Kitten, TA450, TEMP.Zagros, and Yellow Nix, is assessed to be affiliated with Iran’s Ministry of Intelligence and Safety (MOIS). It is identified to be lively since no less than 2017.
The risk actor’s use of Phoenix was first documented by Group-IB final month, describing it as a light-weight model of BugSleep, a Python-based implant linked to MuddyWater. Two totally different variants of Phoenix (Model 3 and Model 4) have been detected within the wild.
The cybersecurity vendor mentioned the attacker’s command-and-control (C2) server (“159.198.36[.]115”) has additionally been discovered internet hosting distant monitoring and administration (RMM) utilities and a customized net browser credential stealer that targets Courageous, Google Chrome, Microsoft Edge, and Opera, suggesting their doubtless use within the operation. It is price noting that MuddyWater has a historical past of distributing distant entry software program through phishing campaigns through the years.
“By deploying up to date malware variants such because the Phoenix v4 backdoor, the FakeUpdate injector, and customized credential-stealing instruments alongside professional RMM utilities like PDQ and Action1, MuddyWater demonstrated an enhanced potential to combine customized code with industrial instruments for improved stealth and persistence,” the researchers mentioned.
