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Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
https://malvuln.com/advisory/2337b9a12ecf50b94fc95e6ac34b3ecc.txt
Contact: malvuln13 () gmail com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.AsyncRat
Vulnerability: Arbitrary Code Execution
Description: The malware looks for and executes a x32-bit "CRYPTSP.dll" PE
file in its current directory. Therefore, we can hijack the 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:\Windows\System32",
if not we grab our process ID and terminate. Leverage RansomLord v3 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: AsyncRat
Type: PE32
MD5: 2337b9a12ecf50b94fc95e6ac34b3ecc
SHA256: 3c703ecb3e8c54e352ff39fadbe789bb2313f848bd69551b07bf2ed0a58744b9
Vuln ID: MVID-2024-0683
Disclosure: 05/14/2024

Exploit/PoC:
1) Download RansomLord v3
    https://github.com/malvuln/RansomLord
2) Locate the x32 CRYPTSP.dll entry using the -m flag (DLL Map)
3) Use -g flag (Generate Exploit) to output an x32 DLL CRYPTSP.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 log the SHA256 hash, full path and filename.


Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).
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