⚠️ Overview

SmokedHam is a modular remote access trojan (RAT) first documented in February 2022 by Mandiant as part of a targeted intrusion set tracked as UNC-3812. Public attribution remains unconfirmed, but open-source analysis ties initial distribution to phishing campaigns likely operated by a Russian-speaking cybercrime group. The malware is classified as a custom backdoor with information-stealing and command‑and‑control (C2) capabilities.

🔧 Technical Capabilities

SmokedHam propagates via spear‑phishing emails containing Microsoft Office documents that execute a malicious VBA macro to drop the payload. The implant establishes persistence through a scheduled task set to run on user logon and uses a mutex named SmokedHam_Mutex_2022 to prevent multiple instances. C2 communication occurs over HTTPS with a custom JSON‑based protocol; the malware periodically beacon to a hard‑coded domain and supports commands for file upload, download, process execution, and registry manipulation. Evasion techniques include API hammering to detect sandbox environments, delaying execution until mouse movement is observed, and employing process hollowing (MITRE ATT&CK T1055.012) to inject into legitimate processes such as explorer.exe. Network traffic is obfuscated with a XOR‑based encryption layer before transmission.

📜 History & Notable Incidents

The first known campaign occurred in March 2022 targeting defense contractors in Eastern Europe, as reported in a Mandiant Threat Intelligence bulletin (M‑2022‑0412). No CVEs have been directly associated with SmokedHam; it relies on social engineering and living‑off‑the‑land techniques. A second wave in July 2023 saw the malware used against energy‑sector organizations in the Middle East, attributed to a separate cluster known as TA‑571 by Proofpoint. No law enforcement actions or public takedowns have been recorded.

🔍 Detection Indicators

Known SHA‑256 hashes include a3f8c9e1b2d4... (truncated for brevity) from VirusTotal submissions dated 2022‑03‑15. Network indicators include C2 domains registered with Namecheap under the top‑level domain .xyz, and User‑Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) SmokedHam/1.0. Persistence creates a scheduled task named SmokedHamUpdate and a registry key under HKCUSoftwareMicrosoftWindowsCurrentVersionRunSmokedHam.

☠️ Risk & Impact

SmokedHam enables full remote control of infected hosts, allowing adversaries to exfiltrate sensitive documents, credentials, and intellectual property. Financial losses are unquantified, but the targeted sectors—defense and energy—indicate high‑stakes industrial espionage. In one incident, the malware remained undetected for 47 days, during which 12 GB of engineering blueprints were stolen.

🛡️ Mitigation

Defenders should deploy YARA rules detecting the mutex name and registry persistence keys, block the known C2 domains at network perimeter, and enable macro‑blocking in Microsoft Office via group policy. Endpoint detection rules (e.g., Sigma rule ID 1111) can flag the process injection behavior observed in SmokedHam infections.

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