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Win32.Ransom.BlueSky MVID-2022-0632 Code Execution

Win32.Ransom.BlueSky MVID-2022-0632 Code Execution
Posted Aug 15, 2022
Authored by malvuln | Site malvuln.com

The BlueSky Win32.Ransom.BlueSky ransomware looks for and executes arbitrary DLLs in its current working directory. Therefore, we can hijack a DLL, execute our own code, and control and terminate the malware pre-encryption. The exploit DLL checks if the current directory is "C:\Windows\System32" and if not we grab our own process ID and terminate. All basic tests were conducted successfully in a virtual machine environment.

tags | exploit, arbitrary
systems | windows, 32
SHA-256 | 89d2bd5ff16cd696ea9036900183536f0e04110cc01f816bc6a135cd810e99bb

Win32.Ransom.BlueSky MVID-2022-0632 Code Execution

Change Mirror Download
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/961fa85207cdc4ef86a076bbff07a409.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Win32.Ransom.BlueSky
Vulnerability: Arbitrary Code Execution
Description: The BlueSky ransomware looks for and executes arbitrary DLLs in its current working directory. Therefore, we can hijack a vuln DLL, execute our own code, control and terminate the malware pre-encryption. The exploit dll checks if the current directory is "C:\Windows\System32", if not we grab our own process ID and terminate. All basic tests were conducted successfully in a virtual machine environment.
Family: BlueSky
Type: PE32
MD5: 961fa85207cdc4ef86a076bbff07a409
Vuln ID: MVID-2022-0632
Disclosure: 08/13/2022
PoC Video URL: https://www.youtube.com/watch?v=osuS8GjdERM

Exploit/PoC:
1) Compile the following C code as "CRYPTSP.dll" 32-bit
2) Place the DLL in same directory as the vuln BlueSky ransomware
3) Run malware

#include "windows.h"

//By malvuln - August 2022
//Purpose: PWN BlueSky ransomware MD5: 961fa85207cdc4ef86a076bbff07a409
//gcc -c CRYPTSP.c -m32
//gcc -shared -o CRYPTSP.dll CRYPTSP.o -m32
/** 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.
**/
BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved){
switch (reason) {
case DLL_PROCESS_ATTACH:
MessageBox(NULL, "BlueSky Ransom\nPWNED!!! by Malvuln", "Code Exec PoC", MB_OK);
TCHAR buf[MAX_PATH];
if(GetCurrentDirectory(MAX_PATH, buf))
if(strcmp("C:\\Windows\\System32", buf) != 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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