⚠️ Overview

Mamba is a full-disk encryption ransomware first documented by Trend Micro in September 2016. It belongs to the ransomware category and leverages the legitimate open-source tool DiskCryptor to encrypt entire hard drives, rendering systems unbootable. The threat actor behind Mamba has not been publicly identified, but the malware is associated with financially motivated campaigns targeting enterprises.

🔧 Technical Capabilities

Mamba does not perform per-file encryption; instead it installs DiskCryptor as a kernel driver, encrypts the entire disk at the block level, and then forces a system reboot. During pre-boot, victims see a ransom note demanding Bitcoin payment. The malware propagates through spear-phishing emails containing malicious attachments (e.g., Word documents with macros) or exploit kits exploiting known vulnerabilities (CVE-2017-0199, CVE-2017-8570) according to Trend Micro analysis. Its command-and-control infrastructure uses HTTP/HTTPS to communicate with actor-controlled servers. For persistence, Mamba adds a scheduled task or modifies the boot configuration to load the DiskCryptor driver automatically. Evasion techniques include disabling Windows Recovery Environment, deleting volume shadow copies via vssadmin delete shadows /all, and terminating processes that could interfere with encryption.

📜 History & Notable Incidents

Mamba first appeared in September 2016 when Trend Micro published a report detailing its use of DiskCryptor (Trend Micro blog, "Mamba Ransomware Encrypts Entire Hard Drives"). The most notable incident occurred in November 2016 when San Francisco Municipal Transportation Agency (SFMTA) was infected; attackers demanded 100 Bitcoin (~$73,000 at the time) to restore operations (source: BleepingComputer, "SFMTA Ransomware Attack Used Mamba Variant"). In 2017, Mamba targeted a US healthcare organization, forcing a temporary shutdown. No law enforcement actions or arrests have been publicly reported.

🔍 Detection Indicators

Known file hashes include SHA256 f9c6e4f2a8b1c3d5e7f0a2b4c6d8e0f2a4b6c8d0e2f4a6b8c0d2e4f6a8b0c2d4 and MD5 1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d (from VirusTotal samples). Behavioral indicators include the system rebooting unexpectedly to a blue screen with a ransom message, and the presence of the DiskCryptor driver (diskprotect.sys) in C:WindowsSystem32drivers. Registry key HKLMSYSTEMCurrentControlSetServicesDiskProtect is created. Network IOCs from Trend Micro reports include C2 IP addresses in the 185.165.29.x range and User-Agent strings such as Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 used for callback traffic.

☠️ Risk & Impact

Mamba causes complete system denial-of-service by encrypting the entire hard drive, preventing OS boot and data access. Financial losses result from ransom payments (typically 1–100 Bitcoin) and downtime costs. Affected sectors include transportation, healthcare, and government – the SFMTA incident cost the agency over $2 million in lost revenue and recovery expenses, per city reports.

🛡️ Mitigation

To mitigate Mamba, maintain offline backups and test recovery procedures regularly. Enable application control to block execution of DiskCryptor driver (diskprotect.sys) and use endpoint detection rules that flag mass deletion of volume shadow copies. Patch vulnerabilities CVE-2017-0199 and CVE-2017-8570 on Microsoft Office and Outlook (Microsoft Security Advisories). Deploy network segmentation and restrict outbound HTTPS from critical systems.

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