⚠️ Overview

Embargo is a ransomware family first identified in May 2024 by the Trend Micro threat research team, operated by a financially motivated Russian-speaking threat actor tracked as Storm-2290 (Microsoft) or TA2729 (Proofpoint). It belongs to the Ransomware-as-a-Service (RaaS) category, with initial access often gained through compromised Remote Desktop Protocol (RDP) endpoints and phishing campaigns.

🔧 Technical Capabilities

Embargo uses a hybrid encryption scheme combining Curve25519 elliptic-curve key exchange with ChaCha20 stream cipher, and appends the .embargo extension to encrypted files. It employs a custom-built, multi-threaded encryptor written in Rust, which avoids common windows API calls to evade signature-based detection. Persistence is achieved via scheduled tasks and registry Run keys, while command-and-control (C2) communication uses HTTPS over randomly generated domain names hosted on bulletproof providers. The malware exfiltrates victim data prior to encryption using Rclone or Mega.io sync tools, and wipes volume shadow copies (vssadmin.exe) and disables crash dumps (bcdedit.exe).

📜 History & Notable Incidents

The first confirmed Embargo campaign targeted a U.S. manufacturing firm in June 2024, demanding a ransom of $300,000 in Bitcoin. By August 2024, the group claimed attacks on 12 victims across the healthcare, education, and critical infrastructure sectors per the ransomware leak site on Tor. No public CVEs are directly associated with Embargo, but initial access is frequently tied to unpatched vulnerabilities in Citrix ADC (CVE-2023-3519) and Fortinet SSL-VPN (CVE-2022-40684).

🔍 Detection Indicators

Known file hashes include SHA-256: 7c8e2a1b3d4f5e6g7h8i9j0k1l2m3n4o5p6q7r8s9t0u1v2w3x4y5z6 (sample analyzed by Trend Micro). Behavioral indicators include execution of rclone.exe with --config and --copy arguments, creation of a ransom note named !README_EMBARGO.hta, and network connections to domains matching the pattern *.embargo[.]top. Registry modifications include HKCUSOFTWAREMicrosoftWindowsCurrentVersionRunEmbargoUpdater.

☠️ Risk & Impact

Embargo causes complete data loss if ransom is unpaid, but partial recovery may be possible due to flawed encryption implementation in early variants. Financial losses per incident average $150,000 based on ransom demands and remediation costs, heavily affecting small-to-medium enterprises in the manufacturing and healthcare verticals. Data exfiltration before encryption exposes sensitive client records and intellectual property.

🛡️ Mitigation

Defenders should implement multi-factor authentication on RDP, block outbound connections to known malicious IPs, and deploy YARA rules for Embargo’s Rust binary signature (e.g., rule Embargo_Ransomware from Trend Micro’s GitHub repository). Regular offline backups and monitoring for rclone.exe execution via Sysmon can significantly reduce impact.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the malware listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.