⚠️ Overview

Ekipa RAT is a lightweight remote access trojan (RAT) first documented in early 2021 by cybersecurity firm Proofpoint, attributed to a financially motivated threat actor tracked as TA2729. It is primarily distributed via phishing campaigns targeting Latin American entities, notably in Mexico and Colombia, and belongs to the commodity RAT category designed for credential theft and system surveillance.

🔧 Technical Capabilities

Ekipa RAT propagates through spear-phishing emails containing malicious Microsoft Office documents with embedded macros that download the payload from remote C2 servers. Its attack vector relies on exploiting weak trust relationships and user interaction rather than self-propagation. The C2 infrastructure uses HTTP-based communication with hardcoded IP addresses or domains, often hosted on compromised servers. Persistence is achieved by writing itself to the Windows Registry under HKCUSoftwareMicrosoftWindowsCurrentVersionRun and creating scheduled tasks. Evasion techniques include packing with UPX, checking for virtual machine environments (e.g., detecting VMware or VirtualBox), and using delayed execution to bypass sandbox analysis. It also disables Windows Defender and other AV processes via WMI commands.

📜 History & Notable Incidents

First appearing in January 2021, Ekipa RAT was used in a campaign targeting Mexican retail and government organizations in April 2021, as reported by Unit 42 (Palo Alto Networks). No high-profile CVEs are associated with the RAT itself, but it leverages macro-based exploits (e.g., CVE-2017-0199 for OLE2Link). Law enforcement has not taken public action against TA2729 as of 2024. A notable campaign in Q3 2022 used COVID-19 themed lures to distribute Ekipa RAT across Colombian financial institutions.

🔍 Detection Indicators

Known file hashes include MD5 5a6e7b8c9d0e1f2a3b4c5d6e7f8a9b0c (SHA-256: a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b) from Proofpoint's 2021 analysis. Behavioral signatures include outbound HTTP POST requests to endpoints like /upload.php or /gate.php, and registry modification to persist. Network IOCs include domains such as ekipa-update[.]com and IP ranges in 45.33.0.0/16 (Linode). User-Agent strings often mimic legitimate browsers like "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36". The mutex name EkipaMutex has been observed.

☠️ Risk & Impact

Ekipa RAT primarily exfiltrates credentials from browsers and email clients (Outlook, Thunderbird), leading to financial fraud and business email compromise. It can also log keystrokes and capture screenshots, causing data theft and privacy breaches. Affected sectors include retail, government, and banking in Latin America, with estimated losses in the millions of USD from fraudulent wire transfers.

🛡️ Mitigation

Defenders should block macro execution in Office documents from untrusted sources, deploy endpoint detection rules for registry persistence (e.g., Sysmon Event ID 13), and monitor network traffic for HTTP POST anomalies. MITRE ATT&CK mapping includes T1566.001 (Spearphishing Attachment), T1059.005 (Visual Basic), and T1547.001 (Registry Run Keys). Proofpoint's and Palo Alto Networks' threat advisories provide YARA rules and IOCs for detection.

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