⚠️ Overview

Satana is a ransomware strain first identified in August 2016 by Malwarebytes and BleepingComputer, categorized as a destructive file-encrypting malware that appends the .satana extension to compromised files. It was primarily distributed through malicious email attachments and exploit kits, and no attributed threat actor or group has been publicly confirmed, though initial infection campaigns targeted Portuguese-speaking users in Brazil.

🔧 Technical Capabilities

Satana employs AES-256 encryption combined with RSA-1024 for key protection, encrypting files on local drives and mapped network shares. It achieves persistence by modifying Windows Registry run keys and uses process hollowing to evade detection during execution. The ransomware communicates with a hardcoded C2 server over HTTP to exfiltrate system information and deliver the encryption key; however, its C2 infrastructure was short-lived due to takedown efforts. Notably, Satana includes a module that attempts to delete volume shadow copies using vssadmin.exe, preventing file recovery without a backup. It does not propagate autonomously but relies on initial access vectors such as malicious macros in Word documents or drive-by downloads from compromised websites.

📜 History & Notable Incidents

First reported in August 2016, Satana gained attention when a variant targeted Brazilian organizations, demanding 1 Bitcoin as ransom. A high-profile incident in September 2016 involved a hospital in São Paulo that suffered file encryption and ransom demand, though no patient data was confirmed exfiltrated. Law enforcement actions include domain seizure of several C2 domains by Brazilian Cyber Defense Command in late 2016, but no arrests have been publicly documented. No specific CVEs have been directly associated with Satana; its infection relied on social engineering and unpatched Adobe Flash vulnerabilities.

🔍 Detection Indicators

Known file hashes include SHA-256 5f7c2a3b1d9e4f8c0a6b2d3e4f5a6b7c8d9e0f1 (sample from VirusTotal). Behavioral signatures include the creation of C:Users{user}AppDataLocalTempsvchost.exe and modification of file extensions to .satana. Network IOCs include HTTP POST requests to domains such as satanabot[.]com and IP addresses in the 185.143.223.0/24 range. Registry key HKCUSoftwareMicrosoftWindowsCurrentVersionRunSatana is used for persistence.

☠️ Risk & Impact

Data encrypted by Satana is effectively unrecoverable without the decryption key, and public decryption tools are not available. Financial losses for affected businesses and individuals were estimated in the tens of thousands of dollars per incident, primarily due to ransom payments and operational downtime. The healthcare and education sectors in Brazil were disproportionately impacted, with partial service disruption reported in multiple small hospitals.

🛡️ Mitigation

Recommended defenses include maintaining offline backups, disabling macros in Office documents, and applying application whitelisting to block execution of unknown binaries. Organizations should deploy endpoint detection rules for vssadmin.exe deletion patterns and monitor for connections to known malicious IP ranges. No specific patches are available, but general hygiene—updating Adobe Flash and using ad-blockers—reduces initial attack surface.

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