Eksekusi Kode FancyBear APT28

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FileBrowser 2.17.2 Code Execution / Cross Site Request Forgery
FileBrowser Code Execution Cross Site Request Forgery

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FancyBear mencari dan menjalankan DLL di direktori saat ini. Oleh karena itu, kami berpotensi membajak DLL untuk mengeksekusi kode kami sendiri dan mengontrol serta menghentikan malware. Eksploitasi DLL akan memeriksa apakah direktori saat ini adalah “C:\Windows\System32” dan jika tidak, kami mengambil ID proses kami dan mengakhiri. Kami tidak perlu bergantung pada tanda tangan hash atau produk pihak ketiga karena kelemahan malware itu sendiri akan bekerja untuk kami. Sistem perlindungan titik akhir dan atau antivirus berpotensi dimatikan sebelum menjalankan malware, tetapi metode ini tidak dapat dilakukan karena tidak ada yang dapat mematikan DLL yang hanya tinggal di disk waiting. Dari perspektif defensif, Anda dapat menambahkan DLL ke jaringan tertentu yang berisi data penting sebagai pendekatan berlapis. Semua tes dasar berhasil dilakukan di lingkungan mesin virtual.

SHA-256 | 6c9b981fb52c57e5101af2cf1b3b81f816bca03e29ff6f1e4765d923fb513d91

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/d6751b148461e0f863548be84020b879.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: APT28 FancyBear
Vulnerability: Code Execution
Description: FancyBear looks for and executes DLLs in its current directory. Therefore, we can potentially hijack a vuln DLL execute our own code, control and terminate the malware. The exploit dll will check if the current directory is "C:\Windows\System32", if not we grab our process ID and terminate. We do not need to rely on hash signature or third-party product, the malwares own flaw will do the work for us. Endpoint protection systems and or antivirus can potentially be killed prior to executing malware, but this method cannot as theres nothing to kill the DLL just lives on disk waiting. From defensive perspective you can add the DLLs to a specific network share containing important data as a layered approach. All basic tests were conducted successfully in a virtual machine environment.
Family: FancyBear
Type: PE32
MD5: d6751b148461e0f863548be84020b879
Vuln ID: MVID-2022-0594
Disclosure: 05/09/2022

Exploit/PoC:
Video Poc URL: https://www.youtube.com/watch?v=8v2bqRX2AEU

Exploit/PoC:
1) Compile the following C code as "winhttp.dll"
2) Place the DLL in same directory as the malware
3) Optional - Hide it: attrib +s +h "winhttp.dll"
4) Run FancyBear

#include "windows.h"

//By malvuln
//Purpose: Exploit FancyBear
//MD5: d6751b148461e0f863548be84020b879
/** DISCLAIMER:
Author is NOT responsible for any damages whatsoever by using this software or improper malware
handling. By using this code you assume and accept all risk implied or otherwise.
**/

//gcc -c winhttp.c -m32
//gcc -shared -o winhttp.dll winhttp.o -m32

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
switch (reason) {
case DLL_PROCESS_ATTACH:
MessageBox(NULL, "Code Exec", "by malvuln", MB_OK);
TCHAR buf[MAX_PATH];
GetCurrentDirectory(MAX_PATH, TEXT(buf));
int rc = strcmp("C:\\Windows\\System32", TEXT(buf));
if(rc != 0){
HANDLE handle = OpenProcess(PROCESS_TERMINATE, FALSE, getpid());
if (NULL != handle) {
TerminateProcess(handle, 0);
CloseHandle(handle);
}
}
break;
}
return TRUE;
}

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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