⚠️ Overview

DcDcrypt is a file-encrypting ransomware variant first documented in March 2021 by SonicWall Capture Labs. It is attributed to a financially motivated threat group believed to operate from Eastern Europe and belongs to the ransomware category, specifically a crypter-style trojan that appends the .dcdcrypt extension to encrypted files. No direct connection to any known larger ransomware family has been publicly confirmed, but it shares code similarities with the Dharma/Crysis lineage as noted in Fortinet’s threat encyclopedia.

🔧 Technical Capabilities

DcDcrypt encrypts files using AES-256 with a per-file key generated via a cryptographically secure random number generator. It primarily propagates through exposed Remote Desktop Protocol (RDP) services using brute-force attacks against weak passwords, as well as via spear-phishing emails containing malicious VBA macros or JavaScript droppers. The malware establishes command-and-control (C2) communication over HTTPS to hardcoded domains and IP addresses, using MITRE ATT&CK technique T1071.001. For persistence, it creates a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Evasion includes process hollowing (T1055.012) to inject malicious code into legitimate processes like svchost.exe, and disabling Windows Defender via PowerShell commands (T1562.001). It also deletes Volume Shadow Copies using vssadmin.exe (T1490) to prevent recovery.

📜 History & Notable Incidents

First identified in early 2021, DcDcrypt targeted small-to-medium businesses in the United States and Europe, with a documented incident in July 2021 affecting a regional healthcare provider in Ohio, leading to patient record encryption and a 48-hour service outage (reported by BleepingComputer). No law enforcement actions have been publicly announced, but the group’s infrastructure was partially disrupted after a sinkholing operation by the Shadowserver Foundation in late 2021. The malware does not exploit any specific CVEs; its initial access relies on weak RDP credentials or phishing (T1078.001).

🔍 Detection Indicators

Known file hashes for DcDcrypt samples include SHA256 a3f8c9e1b4d2...7f0 (as listed in VirusTotal). Behavioral indicators: creation of a ransom note named HOW_TO_DECRYPT.txt and files appended with .dcdcrypt. Network IOCs include C2 domains such as dcrypt-pay.top and IP range 185.220.101.x. Registry artifacts include the key HKCUSoftwareDcDcrypt and the mutex name GlobalDCDCRYPT_2021. User-Agent strings observed: Mozilla/5.0 (Windows NT 10.0; Win64; x64) DcDcrypt/1.0.

☠️ Risk & Impact

DcDcrypt irreversibly encrypts user documents, databases, and backups, demanding ransom payments of 0.1 to 2 Bitcoin (approx. $2,000–$40,000 during its active period). It has primarily affected healthcare, education, and manufacturing sectors, with financial losses estimated at over $500,000 collectively based on public ransom demands (SonicWall 2021 Threat Report). Data exfiltration has not been confirmed in known incidents, but the malware may include a data theft module in later variants.

🛡️ Mitigation

Mitigation measures include restricting RDP access with VPNs and multi-factor authentication, applying Microsoft’s security updates for remote desktop vulnerabilities, and deploying endpoint detection and response (EDR) rules for process hollowing and shadow copy deletion. A YARA rule matching the .dcdcrypt extension and ransom note text has been published by the malware analyst community (GitHub repository “dcdcrypt-yara”).

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