MuddyWater Uses DLL Side-Loading in Global Espionage Campaign Hitting 9 Countries

The Iranian state-linked group MuddyWater ran an active espionage campaign in Q1 2026, targeting at least nine organizations across nine countries on four continents. Victims span industrial and electronics manufacturing, education, public sector, financial services, and professional services verticals, per Symantec and Carbon Black’s Threat Hunter Team.

The campaign’s primary execution technique is DLL side-loading—abusing legitimate, signed executables to load malicious code. Defenders in affected sectors should prioritize monitoring for anomalous DLL loads from trusted processes, apply application allowlisting, and correlate with known MuddyWater infrastructure IOCs.