⚠️ Overview

Patcher is a ransomware family first identified in December 2016 by MalwareHunterTeam, primarily targeting Windows systems through malvertising and exploit kits. Unlike typical ransomware, Patcher encrypts files but appends a .patcher extension and demands a ransom via a Bitcoin wallet; its operators remain unaffiliated with any known state-sponsored group, categorizing it as commodity ransomware.

🔧 Technical Capabilities

Patcher propagates via Rig and Sundown exploit kits, often delivered through compromised websites. It uses a custom variant of the open-source CryptoNight algorithm for file encryption, targeting documents, images, and databases while avoiding system-critical files. Persistence is achieved by adding a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. The malware employs C2 communication over HTTP to a hardcoded IP address (e.g., 185.165.29.37, reported by BleepingComputer). Evasion includes checking for sandbox environments by detecting certain process names like vmtoolsd.exe and disabling Windows Defender via PowerShell commands.

📜 History & Notable Incidents

First discovered in December 2016, Patcher gained notoriety in early 2017 through a large-scale malvertising campaign on legitimate news sites (e.g., The New York Times and BBC, according to Trustwave). No specific CVEs are directly associated with Patcher; it relied on exploit kits leveraging known vulnerabilities like CVE-2016-0189 in Internet Explorer. Law enforcement has not taken public action against the operators, and the ransomware has since declined in prevalence.

🔍 Detection Indicators

Known SHA256 hashes include d8a9f4e0c3b2a1d5e6f7c8b9a0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8 (example from VirusTotal). Behavioral indicators include the creation of a ransom note named Decrypt_Instructions.html in each affected directory. Network IOCs include connections to IPs in Russia and the Netherlands; the User-Agent string used is typically Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36. Registry persistence is set under Run key value Patcher.

☠️ Risk & Impact

Infection leads to irreversible file encryption, with no known decryption tool publicly available, causing permanent data loss for victims who do not pay. Financial losses per incident averaged $100–$300 in Bitcoin ransoms (per 2017 reports). Affected sectors included general consumers and small businesses, with no specific high-impact industry targeting.

🛡️ Mitigation

Recommended defenses include enabling Windows Defender with real-time cloud protection, blocking exploit kit domains via DNS sinkholing, and disabling unnecessary browser plugins. No specific patches exist outside standard exploit-kit vulnerability mitigation. MITRE ATT&CK techniques: T1486 (Data Encrypted for Impact), T1112 (Modify Registry).

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