Authored by malvuln | Site

Multiple variants of Trojan.Win32.DarkGateLoader malware suffer from a code execution vulnerability.

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
Contact: [email protected]

Threat: Trojan.Win32.DarkGateLoader (multi variants)
Vulnerability: Arbitrary Code Execution
Description: Multiple variants of this malware look for and execute x32-bit "urlmon.dll" PE file in its current directory. Therefore, we can hijack that DLL and execute our own code to intercept and terminate the malware. Once loaded the exploit dll will check if the current directory is "C:WindowsSystem32", if not we grab our process ID and terminate. Leverage RansomLord v3.1 for DLL generation, while written as a proof-of-concept to specifically defeat ransomware, it can also be used to generate DLLs to try an exploit other types of malwares. All basic tests were conducted successfully in a virtual machine environment.

Family: DarkGateLoader
Type: PE32
MD5: afe012ed0d96abfe869b9e26ea375824
SHA256: 18d87c514ff25f817eac613c5f2ad39b21b6e04b6da6dbe8291f04549da2c290

Other vulnerable samples:

Vuln ID: MVID-2024-0685
Disclosure: 06/05/2024

1) Download RansomLord v3.1
2) Locate the x32 urlmon.dll entry using the -m flag (DLL Map)
3) Use -g flag (Generate Exploit) to output an x32 DLL urlmon.dll, based on an existing vulnerable malware in the victims list.
4) (Optional) -e flag to setup Windows event IOC logging in the registry, this will attempt to log the SHA256 hash, full path and filename.

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