MuddyWater’s Global Espionage Campaign: Unveiling Advanced Cyber Tactics
In the first quarter of 2026, the Iranian state-sponsored hacking group known as MuddyWater orchestrated a sophisticated cyber espionage campaign, compromising at least nine organizations across nine countries spanning four continents. The targeted sectors included industrial and electronics manufacturing, education, public services, financial services, and professional services. Notably, a major South Korean electronics manufacturer fell victim to this campaign, with attackers maintaining network access for a week in February 2026.
Other significant targets encompassed an international airport in the Middle East, industrial manufacturers in Southeast Asia, and a financial services provider in Latin America. The Threat Hunter Team from Symantec and Carbon Black identified that MuddyWater heavily relied on DLL side-loading techniques to execute malicious payloads under the guise of legitimate software.
Exploitation of Legitimate Binaries
MuddyWater’s strategy involved the misuse of legitimately signed binaries to sideload malicious DLLs:
– Fortemedia’s fmapp.exe: This executable was exploited to sideload a malicious DLL named fmapp.dll. Group-IB previously documented this method in connection with MuddyWater’s Operation Olalampo. The malicious DLL was designed to connect to an attacker-controlled IP address, facilitating unauthorized access and data exfiltration.
– SentinelOne’s sentinelmemoryscanner.exe: By abusing this security product’s binary, MuddyWater sideloaded a rogue DLL named sentinelagentcore.dll. This deliberate choice allowed the attackers to bypass signature-based detection mechanisms, as the security software was trusted within the network environment.
Both malicious DLLs incorporated an open-source tool called ChromElevator, enabling the extraction of sensitive information such as passwords, cookies, and payment card data from Chromium-based browsers. This approach effectively circumvented App-Bound Encryption (ABE) protections, granting attackers access to encrypted browser data.
Advanced Attack Techniques
A distinctive aspect of MuddyWater’s campaign was the utilization of Node.js scripts to execute PowerShell code for reconnaissance and information gathering. This method facilitated various malicious activities:
– Reconnaissance and Data Collection: The attackers deployed PowerShell scripts to perform system reconnaissance, capture screenshots, and extract sensitive data, including the Security Account Manager (SAM) hive, which contains hashed user credentials.
– Privilege Escalation and Lateral Movement: By escalating privileges, MuddyWater gained deeper access within the compromised networks. They employed SOCKS5 reverse-proxy tunneling to maintain covert communication channels and facilitate lateral movement across the network.
In at least one instance, the stolen data was staged on sendit[.]sh, a public file-transfer service, indicating the attackers’ efforts to exfiltrate data without raising suspicion.
Persistent Access and Operational Discipline
During the intrusion into the South Korean electronics manufacturer, MuddyWater demonstrated a methodical approach:
– Repeated Reconnaissance: The attackers consistently executed PowerShell-based reconnaissance to monitor the network environment and identify valuable assets.
– Maintaining Access: By repeatedly executing the compromised binaries, MuddyWater ensured persistent access to the infected host, allowing them to re-establish control if initial access was lost.
The initial vector used to breach the organization remains unknown. However, the attackers’ cadence suggests implant-driven activity rather than continuous operator presence, indicating a shift towards quieter, more disciplined operations. This evolution reflects a significant enhancement in operational hygiene compared to MuddyWater’s earlier activities.
Broader Implications and Sanctions
This campaign coincides with the European Council’s imposition of sanctions against the Iranian company Emennet Pasargad. The company was implicated in hacking a Swedish SMS service, accessing and selling a French subscriber database, and disseminating disinformation via compromised advertising billboards during the 2024 Paris Olympic Games.
Emennet Pasargad, also known as Shahid Shushtari, is affiliated with Iran’s Islamic Revolutionary Guard Corps Cyber-Electronic Command (IRGC-CEC). The U.S. State Department has identified the group under various monikers, including Cobalt Obelisk, Cotton Sandstorm, Haywire Kitten, Marnanbridge, and UNC5866.
According to the State Department, Shahid Shushtari members have inflicted significant financial damage and disruption on U.S. businesses and government agencies through coordinated cyber and cyber-enabled information operations. These campaigns have targeted multiple critical infrastructure sectors, including news, shipping, travel, energy, financial, and telecommunications in the United States, Europe, and the Middle East.
Recent Iranian Cyber Activities
Iran-backed hackers have also been linked to an exfiltration campaign targeting organizations in the U.S., Israel, Saudi Arabia, and Turkey between late March and early April 2026. At least two U.S. victims were subjected to destructive operations, such as the deletion of partitions and data backups.
These incidents were claimed by a pro-Iranian persona named Ababil of Minab. However, analysis from Gambit Security has tied the campaign infrastructure to Iran’s Ministry of Intelligence and Security (MOIS).
Other targets included an Israeli media organization, an Israeli higher education institution, a Turkish insurance brokerage, and several additional websites across sectors such as restaurants, culture, digital services, and news.
While no destructive activity was observed against these victims, the adversary employed a bespoke C++ file collection and exfiltration tool internally codenamed FileFiend. This binary could enumerate local drives and SMB shares, traverse the file system, and send files to a hard-coded command-and-control (C2) server.
Alternatively, data of interest was compressed into RAR archives on a host within the victim environment and uploaded to the organization’s public website at the web root. From there, the data was extracted using the Axel command-line download accelerator and tunneled through proxychains.
Conclusion
MuddyWater’s recent cyber espionage campaign underscores the evolving threat landscape
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