Iranian APT MuddyWater has been found disguising their operations as a Chaos ransomware attack leveraging Microsoft Teams social engineering to infiltrate organizations.
The campaign was characterized by a high-touch social engineering phase conducted via Microsoft Teams, where the attackers utilized interactive screen-sharing to harvest credentials and manipulate Multi-Factor Authentication (MFA). Once inside, the group bypassed traditional ransomware workflows, forgoing file encryption in favor of data exfiltration and long-term persistence via remote management tools like DWAgent. This report deconstructs the infection chain and analyzes the custom “Game.exe” Remote Access Trojan (RAT).
Additionally, this explores the process by which MuddyWater is increasingly leveraging the cybercriminal ecosystem to provide plausible deniability for geopolitical espionage and prepositioning, particularly in the US. The strategy highlights the convergence between state-sponsored intrusion activity and criminal tradecraft, where a big “tell” lies in the techniques that were deployed – and those that weren’t.
This overall strategy suggests the primary goal was not financial gain. It is also further proof of the lines blurring against the background of geopolitical tensions, and that attribution is becoming more difficult if teams do not take it upon themselves to conduct proper and thorough research.
More details here: https://www.rapid7.com/blog/post/tr-muddying-tracks-state-sponsored-shadow-behind-chaos-ransomware/
Ensar Seker, CISO at threat intel company SOCRadar, commented:
“The MuddyWater activity is another example of how state-aligned threat actors increasingly blur the line between cybercrime and cyber-espionage. Using Chaos ransomware as a decoy, provides plausible deniability while also distracting incident responders into treating the intrusion as financially motivated cybercrime instead of a long-term intelligence collection operation. This tactic complicates attribution, delays strategic response decisions, and increases confusion during the critical early stages of an investigation.
The Microsoft Teams social engineering component is particularly notable because collaboration platforms are becoming one of the most effective initial access vectors. Employees inherently trust internal communication tools, and attackers understand that exploiting human familiarity inside business collaboration environments often bypasses traditional email-focused security controls. Organizations should treat Teams, Slack, and similar platforms as high-risk attack surfaces, applying the same monitoring, user awareness, and identity protection strategies traditionally reserved for email and VPN infrastructure.”
Threat actors come in all shapes and sizes. Thus as Mr. Seker says, consider everything to be a potential threat. And I would add to that the fact that nothing should be trusted.
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This entry was posted on May 7, 2026 at 7:58 am and is filed under Commentary with tags Hacked, Iran. You can follow any responses to this entry through the RSS 2.0 feed.
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Iranian APT MuddyWater Disguise Their Operations as a Chaos Ransomware Attack
Iranian APT MuddyWater has been found disguising their operations as a Chaos ransomware attack leveraging Microsoft Teams social engineering to infiltrate organizations.
The campaign was characterized by a high-touch social engineering phase conducted via Microsoft Teams, where the attackers utilized interactive screen-sharing to harvest credentials and manipulate Multi-Factor Authentication (MFA). Once inside, the group bypassed traditional ransomware workflows, forgoing file encryption in favor of data exfiltration and long-term persistence via remote management tools like DWAgent. This report deconstructs the infection chain and analyzes the custom “Game.exe” Remote Access Trojan (RAT).
Additionally, this explores the process by which MuddyWater is increasingly leveraging the cybercriminal ecosystem to provide plausible deniability for geopolitical espionage and prepositioning, particularly in the US. The strategy highlights the convergence between state-sponsored intrusion activity and criminal tradecraft, where a big “tell” lies in the techniques that were deployed – and those that weren’t.
This overall strategy suggests the primary goal was not financial gain. It is also further proof of the lines blurring against the background of geopolitical tensions, and that attribution is becoming more difficult if teams do not take it upon themselves to conduct proper and thorough research.
More details here: https://www.rapid7.com/blog/post/tr-muddying-tracks-state-sponsored-shadow-behind-chaos-ransomware/
Ensar Seker, CISO at threat intel company SOCRadar, commented:
“The MuddyWater activity is another example of how state-aligned threat actors increasingly blur the line between cybercrime and cyber-espionage. Using Chaos ransomware as a decoy, provides plausible deniability while also distracting incident responders into treating the intrusion as financially motivated cybercrime instead of a long-term intelligence collection operation. This tactic complicates attribution, delays strategic response decisions, and increases confusion during the critical early stages of an investigation.
The Microsoft Teams social engineering component is particularly notable because collaboration platforms are becoming one of the most effective initial access vectors. Employees inherently trust internal communication tools, and attackers understand that exploiting human familiarity inside business collaboration environments often bypasses traditional email-focused security controls. Organizations should treat Teams, Slack, and similar platforms as high-risk attack surfaces, applying the same monitoring, user awareness, and identity protection strategies traditionally reserved for email and VPN infrastructure.”
Threat actors come in all shapes and sizes. Thus as Mr. Seker says, consider everything to be a potential threat. And I would add to that the fact that nothing should be trusted.
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This entry was posted on May 7, 2026 at 7:58 am and is filed under Commentary with tags Hacked, Iran. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.