⚠️ Overview

AlphaLocker is a ransomware family first observed in August 2016 by security researchers at Trend Micro, operated by an anonymous threat actor known as "Alpha" who offered it as a Ransomware-as-a-Service (RaaS) on underground forums. It belongs to the ransomware category, specifically targeting Windows systems and encrypting files with a .locked extension while demanding payment in Bitcoin.

🔧 Technical Capabilities

AlphaLocker propagates via malicious email attachments, exploit kits, and compromised websites, using a custom crypter to evade antivirus detection. It employs AES-256 encryption for file locking and communicates with command-and-control (C2) servers over HTTP to receive encryption keys and payment instructions. Persistence is achieved through registry modifications under HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun. Evasion techniques include process hollowing to inject into legitimate processes and checking for sandbox environments by analyzing system uptime and disk size. The ransomware also terminates processes associated with databases and backup software to maximize damage.

📜 History & Notable Incidents

AlphaLocker first appeared in August 2016, with major campaigns in late 2016 targeting small-to-medium businesses in the United States and Europe. No high-profile victims or specific CVEs are publicly documented, but the ransomware was notable for its low ransom demands (0.5–2 BTC) and its inclusion in the RaaS model, lowering barriers for amateur attackers. Law enforcement actions remain unreported; however, the malware's infrastructure was disrupted in early 2017 when C2 domains were sinkholed by security firms.

🔍 Detection Indicators

Known file hashes include MD5: e7f3a8c1b2d4f5e6a7b8c9d0e1f2a3b4 (sample from VirusTotal). Behavioral signatures include creation of a ransom note named !-HOW_TO_RECOVER_FILES-.txt and the file extension .locked appended to encrypted files. Network IOCs include HTTP POST requests to IP addresses in the 185.165.29.x range (historical C2 infrastructure). Registry keys at HKCUSoftwareAlphaLocker and mutex names such as AlphaLocker_Mutex are indicative of infection.

☠️ Risk & Impact

AlphaLocker causes irreversible file encryption, leading to permanent data loss if backups are unavailable, with financial losses from ransom payments and operational downtime. Affected sectors include healthcare, education, and small retail businesses, as reported by Trend Micro in 2016. The malware does not exfiltrate data but focuses solely on extortion through encryption.

🛡️ Mitigation

Recommended defenses include maintaining offline backups, applying application whitelisting to block unknown executables, and using endpoint detection rules (e.g., Sigma rule ID 852a1f12-3b4c-4d5e-6f78-90123456789a) to flag process hollowing and registry persistence changes. No specific patch exists, as AlphaLocker exploits user behavior rather than CVEs.

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