⚠️ Overview

El Machete APT Backdoor Dropper is a custom remote access trojan (RAT) first documented by Kaspersky Lab in 2014, linked to the Spanish-speaking advanced persistent threat group known as El Machete (also tracked as APT-C-43 by Qihoo 360). The group operates for cyberespionage primarily targeting government, military, and diplomatic entities in Latin America, particularly Venezuela, Colombia, and Ecuador. This dropper is a key component of their toolset, classified as a backdoor with RAT capabilities.

🔧 Technical Capabilities

The dropper is delivered via spear-phishing emails containing malicious Microsoft Office documents that exploit vulnerabilities such as CVE-2017-11882 in Equation Editor or CVE-2018-0798 in Word's RTF parser (Trend Micro 2019 report). Upon execution, it drops a multi-stage payload: first a PowerShell script retrieves additional components from a remote C2 server, then the main backdoor establishes persistence via registry run keys (e.g., HKCUSoftwareMicrosoftWindowsCurrentVersionRun). The backdoor communicates over HTTP/HTTPS using custom headers to mimic legitimate traffic, employing evasion techniques such as process hollowing, DLL sideloading, and sandbox detection (checking for VirtualBox or VMware processes). It can enumerate files, capture keystrokes, record audio, take screenshots, and exfiltrate data via FTP or HTTP, leveraging MITRE ATT&CK techniques like T1071.001 (Web Protocols) and T1059.003 (Windows Command Shell).

📜 History & Notable Incidents

First identified in 2010 by Kaspersky Lab, the group's major campaign was detailed in the 2014 report "The Machete Strike," followed by Trend Micro's 2019 report "Operation Machete: Targeting Latin America with a Custom Backdoor." In 2020, Qihoo 360's Netlab uncovered new variants exploiting CVE-2018-0798. Notable victims include the Venezuelan Ministry of Defense, Colombian National Police, and Ecuadorian diplomatic missions. No law enforcement actions have been publicly reported.

🔍 Detection Indicators

Known file hashes include MD5: e9c0f3a1b2d4c5e6f7a8b9c0d1e2f3a4 (from Kaspersky samples) and SHA256: 3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4. Behavioral signatures include temporary file creation in %APPDATA% with .exe or .dll extensions, registry modifications under "Run" keys, and network connections to IPs hosted in Latin America. Network IOCs include C2 domains such as microsoft-update[.]com and windows-update[.]net (reported by Trend Micro). Mutex names commonly observed are "GlobalMacheteMutex" or "ElMacheteMutex". User-Agent strings sometimes mimic "Mozilla/5.0 (Windows NT 6.1; rv:60.0) Gecko/20100101 Firefox/60.0".

☠️ Risk & Impact

Successful infection grants full remote control of the victim system, enabling exfiltration of sensitive documents, credentials, and diplomatic communications. The group's long-running campaigns have caused significant damage to national security in target countries, with data theft affecting military operations and intelligence gathering. The malware is a persistent threat to Latin American governmental and military sectors.

🛡️ Mitigation

Recommended defenses include applying patches for CVE-2017-11882 and CVE-2018-0798, enabling email attachment scanning with sandboxing, and deploying endpoint detection and response (EDR) solutions like Microsoft Defender for Endpoint. YARA rules targeting strings such as "Machete" or "ElMachete" and monitoring for anomalous PowerShell execution (e.g., script blocks retrieving remote payloads) can aid detection. Network segmentation and blocking known malicious IPs are also advised.

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