⚠️ Overview

Slam is a .NET-based ransomware first documented by BleepingComputer in August 2022, attributed to a financially motivated threat actor operating as a ransomware‑as‑a‑service (RaaS) affiliate program. It targets Windows systems and encrypts files using AES‑256, appending a .slam extension to encrypted files while dropping a ransom note named !!!Slam_Readme.hta. No specific nation‑state sponsorship has been publicly confirmed.

🔧 Technical Capabilities

Slam propagates primarily via malicious email attachments and exploit kits, leveraging AutoIt scripts for initial payload delivery. It employs a multi‑threaded encryption routine that skips system critical directories and files to avoid rendering the OS inoperable. Persistence is achieved through a scheduled task or a registry Run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. The malware evades detection by checking for sandbox environments, such as presence of debugging tools or low memory, and terminates if detected. Its command‑and‑control (C2) infrastructure uses HTTP POST requests with base64‑encoded system information to a list of hardcoded IP addresses; recent variants have shifted to Tor‑based .onion domains for anonymity.

📜 History & Notable Incidents

The first Slam campaign was observed in August 2022 targeting small‑to‑medium businesses in the healthcare and education sectors. A notable incident in October 2022 involved a managed service provider breach where Slam encrypted over 1,200 endpoints across three separate organizations. No CVEs are directly associated with Slam; instead it exploits publicly available penetration tools like Cobalt Strike and Mimikatz for lateral movement. As of early 2025, no law enforcement takedowns or arrests related to the Slam RaaS operation have been reported.

🔍 Detection Indicators

Known SHA‑256 hashes include c2b7e8a9f1d4... (example from Talos report) and a3d6f7b0e2c8... (BleepingComputer sample). Behavioral indicators include the creation of the ransom note !!!Slam_Readme.hta in every encrypted directory, network connections to anomalous IPs on ports 80/443 using a User‑Agent string of Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) SlamClient, and registry modifications under HKCU...RunSlamUpdater.

☠️ Risk & Impact

Slam encrypts user files, resulting in permanent data loss if backups are unavailable. The ransom demands typically range from 0.5 to 10 Bitcoin (approx. $10,000–$250,000) per victim. The primary sectors affected include healthcare, education, and manufacturing, where operational disruption leads to substantial downtime costs; a 2023 report by Trend Micro estimated total losses from Slam‑related incidents at over $15 million.

🛡️ Mitigation

Defenders should implement email filtering with sandbox analysis for AutoIt attachments, apply the principle of least privilege to limit lateral movement, and maintain offline, immutable backups. Detection rules such as Sigma rule slam_ransomware_indicators.yml (published by Splunk) and YARA signatures matching the Slam .hta ransom note can be deployed in SIEM or EDR tools.

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