⚠️ Overview

BlackMatter is a ransomware-as-a-service (RaaS) family first identified in July 2021 by cybersecurity firm Recorded Future, widely believed to be a rebrand of the DarkSide group following law enforcement pressure. Operated by a Russian-speaking threat actor known as the BlackMatter Syndicate, it targeted enterprise environments and critical infrastructure sectors.

🔧 Technical Capabilities

Written primarily in Rust and C++, BlackMatter employs AES-256 for file encryption and RSA-4096 for key protection, using a hybrid cryptographic scheme. It propagates via compromised Remote Desktop Protocol (RDP) connections, spear-phishing emails with malicious attachments, and exploitation of vulnerabilities in VPN appliances and Microsoft Exchange servers (e.g., ProxyShell). The malware uses a dedicated command-and-control (C2) infrastructure over HTTPS, often hosted on bulletproof hosting providers, and exfiltrates data before encryption using tools like Cobalt Strike and SystemBC for persistence and lateral movement. Evasion techniques include disabling antivirus services, deleting volume shadow copies, and checking for debugger presence to avoid sandbox analysis.

📜 History & Notable Incidents

BlackMatter’s first major attack targeted the US agricultural cooperative NEW Cooperative in September 2021, disrupting grain and ethanol production. Other high-profile victims include Japanese electronics manufacturer Olympus, US energy services provider Invenergy, and several food supply chain companies. The group exploited CVE-2021-34527 (PrintNightmare) and CVE-2021-40444 (MSHTML zero-day) to gain initial access. In November 2021, the FBI and international partners seized BlackMatter’s leak site and cryptocurrency wallets, leading to the group’s operational shutdown; however, remnants are suspected to have contributed to the formation of the ALPHV/BlackCat ransomware.

🔍 Detection Indicators

Known file hashes include SHA-256 samples like e92c1e1c5b3a24a1b2c6d8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9 (actual hashes vary per variant). Behavioral indicators include creation of ransom notes named README.txt or BlackMatter.txt, mutex names such as Global\BlackMatter, and network connections to known C2 IPs listed in CISA advisory AA21-291A. Registry modifications under HKCU\Software\BlackMatter and user-agent strings mimicking legitimate browsers (e.g., Mozilla/5.0) have been observed.

☠️ Risk & Impact

BlackMatter caused significant financial losses, with ransom demands ranging from $200,000 to $15 million per victim, according to FBI reporting. The malware encrypted critical systems in the food and agriculture, energy, and manufacturing sectors, leading to operational downtime and data exfiltration. A September 2021 attack on NEW Cooperative forced the temporary shutdown of grain elevator operations, impacting US food supply chains.

🛡️ Mitigation

Recommended defenses include patching known vulnerabilities (CVE-2021-34527, CVE-2021-40444), enabling multi-factor authentication for RDP and VPN services, and maintaining offline backups. Detection rules such as Sigma and YARA signatures for BlackMatter’s encryption routines are available from the MITRE ATT&CK framework (T1486, T1070.004) and vendor advisories from CISA and Trend Micro. Deploy endpoint detection and response (EDR) tools to monitor for lateral movement and encryption behavior.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the malware listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.