Iranian cyber espionage disguised as a Chaos Ransomware attack

(Pierluigi Paganini – Security Affairs) A newly discovered cyber intrusion attributed to the Iran-linked APT MuddyWater (aka SeedWorm, TEMP.Zagros, Mango Sandstorm, TA450, and Static Kitten) reveals how state-sponsored attackers are increasingly leveraging ransomware tactics to disguise espionage operations. The campaign, uncovered by security researchers at Rapid7, blended social engineering, credential theft, data exfiltration, and extortion under the guise of a ransomware incident — but with no evidence of actual file encryption. The attack unfolded in early 2026 and initially appeared to be a routine ransomware case. Victims were led to believe they were dealing with the Chaos ransomware group, which operates a leak site for stolen data. However, further investigation showed no ransomware had been deployed. Instead, the attackers relied on espionage tradecraft — lateral movement, credential harvesting, and information theft — consistent with MuddyWater’s long-standing intelligence-gathering profile. “In early 2026, a sophisticated intrusion initially appearing to be a standard Chaos ransomware attack was assessed to be consistent with a targeted state-sponsored operation. While the threat actor operated under the banner of the Chaos ransomware-as-a-service (RaaS) group, forensic analysis revealed the incident was a “false flag” masquerade.” reads the report published by Rapid7. “Technical artifacts, including a specific code-signing certificate and Command-and-Control (C2) infrastructure, suggest with moderate confidence that this activity is linked to MuddyWater (Seedworm), an Iranian Advanced Persistent Threat (APT) affiliated with the Ministry of Intelligence and Security (MOIS).” – Iranian cyber espionage disguised as a Chaos Ransomware attack