MuddyWater Targets Global Organizations with DLL Side-Loading
Iranian group MuddyWater exploits DLL side-loading in espionage affecting nine nations.
March 2026 — MuddyWater, an Iranian hacking group, has launched an espionage campaign impacting organizations in nine countries across four continents, said Symantec's Threat Hunter Team. The targets include sectors such as industrial, electronics manufacturing, education, public-sector bodies, financial services, and professional services.
The Threat Hunter Team from Symantec, in collaboration with Carbon Black, attributed the campaign to MuddyWater. The hackers employed DLL side-loading techniques to breach defenses. This method involves exploiting legitimate applications to execute malicious payloads, which often goes undetected.
So far, no specific names of the affected organizations have been released. However, the activity reportedly began in the first quarter of 2026. Public-sector bodies and industrial sectors were among the most impacted, said the Symantec team.
The DLL side-loading technique used by MuddyWater highlights a growing trend in cyber espionage methods. But security experts note that such techniques are not new, just less commonly publicized.
Next steps involve affected organizations conducting thorough audits and patching vulnerabilities promptly. Symantec and Carbon Black are expected to release further technical details on the campaign in a forthcoming advisory.
