PyRAT, a sophisticated Python-based Remote Access Trojan (RAT), has surfaced that provides cross-platform control over Windows, Linux, and macOS systems while eluding major antivirus engines. VirusTotal analysis of sample hash 5dca94edf42e5578edccf63a51790e68ec46fa0fb6377c884b056339cfb58dac revealed the malware's low detection rates and powerful remote access toolkit, which security researchers at K7 Labs discovered. PyRAT poses a threat to both individuals and businesses by taking advantage of Python's adaptability for data exfiltration, command execution, and covert persistence.

Static Analysis Discloses Python Core PyRAT uses pyinstxtractor to unpack into Python bytecode while disguising itself as an ELF binary (Figure 1 & 2). A monolithic "Agent" class filled with imports such as requests, socket, subprocess, os, threading, json, platform, and shutil is revealed when the primary entry point, agent-svc.pyc, decompiles.

ELF's Hidden RAT (Source: K7 Security Labs) These make it a Swiss Army knife for attackers by enabling network operations, system interaction, and concurrent tasks. Persistence Techniques and System Fingerprinting PyRAT fingerprints victims upon launch by obtaining hostname, OS details, and user information (Figure 4). For C2 tracking, it creates a unique ID based on the username and MAC address (Figure 5), withstanding reboots but not hardware swaps.

Persistence avoids admin requirements by being cunning and user-level. Linux employs XDG autostart with a phony ~/.config/autostart/dpkgn.desktop that is hidden in secret directories and mimics Debian tools (Figures 9 & 10). Windows targets user home directories by adding a "lee" registry entry in HKCU\Run (Figures 11 & 12). A decorator guarantees non-blocking C2 loops, while threading maintains smooth operations (Figure 6).

PyRAT uses plaintext HTTP POSTs with JSON payloads to send beacons to /api/{uid}/hello; there is no encryption or authentication other than UID (Figures 7 & 8). Active polls every 0.5 seconds, while idle mode stretches intervals. Data bundling (Source: K7 Security Labs) Commands are powerful: runcmd: Shell execution with capture of stdout and stderr (Figure 13).

cd/ls: File listing and directory navigation to /tmp/list.txt (Figures 14 and 15). upload/download: Threaded for responsiveness, chunked multipart transfers (Figure 16). zip: DEFLATE archives of dirs for bulk exfil (Figure 17). screenshot: PIL ImageGrab in threads, JPEG upload (Figure 18).

Self-destruct via “clean” wipes persistence, dirs, and RunOnce for post-reboot cleanup on Windows (Figure 19). Adaptive beaconing minimizes footprints. IOCs and Defenses Key hash: 0fed60850aa38127095f21182cc2c85d (K7 detection: Trojan/0001140e1).

Because PyRAT is based on Python, it is simple to modify and cross-compile, increasing the risk of APTs and script kiddies. Network encryption should be enforced, XDG autostart and HKCU Run should be monitored, and anomalous ELF/PyInstaller bins should be scanned.