Who is MuddyWater?
MuddyWater is a cyberespionage group linked to Iran’s Ministry of Intelligence and Security (MOIS). Active since at least 2017, the group’s main goal is intelligence gathering. They support Iranian state interests by targeting strategic sectors.
Their campaigns focus on government and private organizations in the Middle East, Europe, and North America. MuddyWater is known for its continuous activity and for updating its tools to evade detection.
Common Tactics and Tools
MuddyWater’s main entry points are spear-phishing and exploiting public-facing applications. They use malicious documents or exploit known software bugs to gain initial access.
The group uses a mix of custom scripts and legitimate software to blend in with normal network traffic.
- POWERSTATS: The group’s signature PowerShell-based backdoor. It is used to establish a foothold, execute commands, and download additional tools.
- Living off the Land: MuddyWater heavily uses legitimate tools already on a system, like PowerShell, to carry out its attacks. This makes their activity difficult to spot.
- Remote Management Tools (RMM): The group often abuses legitimate RMM software, like ConnectWise Control, to maintain persistent access and control over compromised systems.
How to Defend Against MuddyWater
Defense against MuddyWater requires strong email security and a focus on detecting abuse of legitimate tools.
- Enhance email security: Use advanced email gateways to scan for and block malicious attachments. Train users to spot and report spear-phishing attempts.
- Prioritize software patching: Keep all internet-facing applications, like Microsoft Exchange, fully patched to close the security holes MuddyWater uses.
- Restrict malicious scripts: Use application control to block or monitor the use of PowerShell and other scripting languages that attackers abuse.
- Adopt an Assume Breach mindset: Attackers are becoming adept at bypassing endpoint security. Strong network security is vital. Use Network Detection and Response (NDR), like Lumu, to monitor traffic and detect the abuse of legitimate tools and C2 communications.
