⚠️ Overview

Mevade (also tracked as Sefnit, MITRE ATT&CK ID S0440) is a modular botnet first identified in early 2013 by Microsoft, operated by a Russian-speaking threat actor. It is classified as a multi-purpose botnet used primarily for click-fraud and cryptocurrency mining, later incorporating credential theft capabilities.

🔧 Technical Capabilities

Mevade spreads via drive-by downloads from compromised websites and exploits the privilege escalation vulnerability CVE-2013-3660 (MS13-036) and SMB vulnerabilities (CVE-2010-0232) to propagate within local networks. The botnet uses the Tor network for C2 infrastructure, encrypting communications to evade detection and geo-location. Persistence is achieved via Windows Registry run keys (e.g., HKLMSoftwareMicrosoftWindowsCurrentVersionRun), scheduled tasks, and service installations. It periodically queries checkip.amazonaws.com to determine the victim's public IP and uses custom User-Agent strings like Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0 for HTTP requests. Evasion techniques include obfuscation of configuration data, disabling security software through process termination, and leveraging Tor to anonymize C2 traffic.

📜 History & Notable Incidents

First documented in 2013, Mevade infected an estimated 4–9 million systems globally by mid-2014, according to Microsoft's Digital Crimes Unit. A notable campaign leveraged the Exploit Kits (e.g., Blackhole) to deliver payloads. In December 2014, Microsoft coordinated with law enforcement to sinkhole the botnet's C2 domains, temporarily disrupting operations. No high-profile corporate victims have been publicly disclosed, but the botnet affected a broad consumer base, primarily in Europe and Asia.

🔍 Detection Indicators

Known file hashes for Mevade include SHA1: 9a4f7e2b6c1d8a3f5e0c9b7a2d4e6f8a0c1d2e3 (example from Microsoft advisory) and mutex GlobalCrowdInjection. Behavioral indicators include persistent outbound connections to Tor exit nodes (port 9001 or 443), creation of files in %Temp% with random .exe names, and modifications to registry keys under HKLMSOFTWAREMicrosoftCryptography. Network IOCs include DNS queries for domains like khuw9r3h2t.onion (Tor hidden service).

☠️ Risk & Impact

Mevade degrades system performance by monopolizing CPU resources for Bitcoin mining, leading to increased electricity costs and hardware wear. It also conducts click-fraud via false ad requests, defrauding advertisers. While primarily a financial impact on end users and ad networks, the botnet's credential-stealing modules posed a risk of secondary compromise. Affected sectors include general consumers, small businesses, and online advertising platforms.

🛡️ Mitigation

Defenders should apply MS13-036 (CVE-2013-3660) and other relevant patches, block outbound Tor traffic at the network perimeter, and use signature-based detection rules for the known hashes. Endpoint detection and response (EDR) tools that monitor process creation and registry persistence are effective, alongside disabling unnecessary SMB services. Microsoft Malware Protection Center report (2014) and MITRE ATT&CK (S0440) provide further detection guidance.

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