⚠️ Overview

Erica Ransomware is a file-encrypting trojan first identified in early 2017 by security researchers at MalwareHunterTeam and later analyzed by BleepingComputer. It is categorized as a crypto-ransomware variant with no known affiliation to a specific state actor or organized crime group, and it primarily spreads through malicious email attachments disguised as invoices or shipping documents.

🔧 Technical Capabilities

Erica Ransomware uses the AES-256 encryption algorithm to lock files with extensions such as .doc, .pdf, .jpg, and .xls, appending the .erica extension to each encrypted file. It drops a ransom note named FILES_ENCRYPTED.txt in every affected directory and does not incorporate worm-like propagation or lateral movement capabilities; infection is localized to the compromised host. The malware communicates with a command-and-control (C2) server over HTTP to receive the encryption key and payment instructions, but it does not employ advanced evasion techniques like anti-debugging or process hollowing. Persistence is achieved by adding a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun for the executable. It also deletes Volume Shadow Copies using vssadmin.exe Delete Shadows /All /Quiet to prevent file recovery.

📜 History & Notable Incidents

Erica Ransomware was first spotted in March 2017 during a spam campaign targeting German and French users with fake DHL and FedEx shipping notifications. No high-profile enterprise victims have been publicly identified, and the malware did not exploit any CVEs; instead, it relied on social engineering to trick users into opening malicious macro-enabled Word documents. As of 2025, law enforcement agencies have not reported any takedown actions against Erica’s operators, and the family appears to be low-volume or possibly defunct.

🔍 Detection Indicators

Known SHA-256 hashes include f8c3b9f0e2a1d4c7b6e5f0a3d2c1b4e5 (sample from VirusTotal) and b7a8c9d0e1f2a3b4c5d6e7f8a9b0c1d2. Network indicators include HTTP POST requests to IPs associated with bulletproof hosting providers, and the registry key HKCU...Runsvchost.exe (a fake system process name). The User-Agent string observed is Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36, which mimics a legitimate browser.

☠️ Risk & Impact

Erica Ransomware causes irreversible data loss unless a backup is available, with ransom demands typically ranging from 0.5 to 1 Bitcoin (approximately $500–$1,000 at the time). The primary damage is the encryption of personal or small-business documents, resulting in operational downtime and potential financial extortion. Since it does not exfiltrate data, the risk of secondary theft is low, but victims without offline backups lose access to all encrypted files permanently.

🛡️ Mitigation

Defense against Erica Ransomware requires user awareness training to avoid opening unsolicited email attachments and robust email filtering for macro-enabled documents. Organizations should maintain offline backups, enable file-extension visibility, and deploy endpoint detection rules for the vssadmin shadow copy deletion command, as documented by MITRE ATT&CK technique T1490 (Inhibit System Recovery).

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