PAKLOG

PAKLOG is a keylogger known to be leveraged by Mustang Panda and was first observed utilized in 2024. PAKLOG is deployed via a RAR archive (e.g., key.rar), which contains two files: a signed, legitimate binary (PACLOUD.exe) and the malicious PAKLOG DLL (pa_lang2.dll). The PACLOUD.exe binary is used to side-load the PAKLOG DLL which starts with the keylogger functionality.[1]

ID: S1233
Type: MALWARE
Platforms: Windows
Version: 1.0
Created: 12 September 2025
Last Modified: 21 October 2025

Techniques Used

Domain ID Name Use
Enterprise T1010 Application Window Discovery

PAKLOG has used GetForegroundWindow to access the foreground window. [1] PAKLOG has also captured text from the foreground windows.[1]

Enterprise T1115 Clipboard Data

PAKLOG has monitored and extracted clipboard contents.[1]

Enterprise T1074 .001 Data Staged: Local Data Staging

PAKLOG has stored the captured data in a file located C:\\Users\\Public\\Libraries\\record.txt.[1]

Enterprise T1574 .001 Hijack Execution Flow: DLL

PAKLOG has leveraged legitimate binaries to conduct DLL side-loading.[1]

Enterprise T1056 .001 Input Capture: Keylogging

PAKLOG has captured keystrokes using Windows API.[1]

Enterprise T1106 Native API

PAKLOG has used Windows API SetWindowsHookExW with idHook set to WH_KEYBOARD_LL and a custom hook procedure to support its keylogging functions.[1]

Enterprise T1027 .013 Obfuscated Files or Information: Encrypted/Encoded File

PAKLOG has utilized a simple encoding mechanism to encode characters in the buffer.[1]

Enterprise T1057 Process Discovery

PAKLOG has detected and logged the full path of processes active in the foreground using Windows API calls.[1]

Enterprise T1553 .002 Subvert Trust Controls: Code Signing

PAKLOG has used legitimate signed binaries such as PACLOUD.exe for follow-on execution of malicious DLLs through DLL Side-Loading.[1]

Enterprise T1124 System Time Discovery

PAKLOG has collected a timestamp to log the precise time a key was pressed, formatted as %Y-%m-%d %H:%M:%S.[1]

Groups That Use This Software

ID Name References
G0129 Mustang Panda

[1]

References