#Iran-Linked MuddyWater Deploys Highly Sophisticated Dindoor Malware Against US Organizations

In a recent development that highlights the evolving threat landscape in cybersecurity, an Iran-linked Advanced Persistent Threat (APT) group known as MuddyWater has been spotted deploying a new backdoor called Dindoor across multiple sectors of the United States. This latest campaign marks another escalation by the group, which has previously targeted entities in the Middle East and beyond.

MuddyWater, also known as SeedWorm, TEMP.Zagros, Mango Sandstorm, TA450, and Static Kitten, is a well-known APT group linked to Iran's Ministry of Intelligence and Security (MOIS). The group's activities have been associated with espionage, disruption, and influence operations, often targeting organizations in the telecommunications, government (IT services), and oil sectors. With this latest deployment of Dindoor malware, MuddyWater has demonstrated its ability to adapt and evolve its attack techniques.

According to a report published by Broadcom's Symantec Threat Hunter Team, the campaign began in February 2026 and has continued in recent days. The researchers observed that the group deployed Dindoor across multiple sectors, including banks, airports, nonprofits, and the Israeli branch of a software company. Notably, the malware relies on the Deno runtime to execute JavaScript and TypeScript code and was signed with a certificate issued to "Amy Cherne."

Interestingly, researchers also spotted an attempt to exfiltrate data from a targeted software company using Rclone to a Wasabi Technologies cloud storage bucket, though it's unclear if the transfer succeeded. Additionally, a separate Python backdoor, dubbed Fakeset, was observed on U.S. airport and nonprofit networks, signed with certificates tied to Seedworm.

The deployment of Dindoor malware highlights the sophistication and complexity of modern cyber threats. It also underscores the importance of ongoing cybersecurity awareness and vigilance among organizations and individuals. As experts note, one of the hallmarks of Iran's operations in cyberspace is that it periodically mounts destructive attacks against organizations in countries deemed hostile.

The recent activity linked to Iranian cyber actors demonstrates a mix of espionage, disruption, and influence operations. Researchers warn that Iranian-aligned actors may escalate with DDoS attacks, defacements, credential theft, leaks, and potentially destructive operations targeting critical infrastructure, energy, transport, telecoms, healthcare, and defense sectors.

As the threat landscape continues to evolve, it is essential for organizations and individuals to stay informed about emerging threats and best practices for cybersecurity. By doing so, we can work together to mitigate the risks associated with these types of attacks and protect our sensitive information and critical infrastructure.

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Conclusion:

The recent deployment of Dindoor malware by MuddyWater highlights the sophistication and adaptability of modern cyber threats. As organizations and individuals continue to navigate this complex threat landscape, it is essential to remain vigilant and informed about emerging threats and best practices for cybersecurity. By doing so, we can work together to protect our sensitive information and critical infrastructure.

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