Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source:  
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:  
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  
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) {  
MessageBox(NULL, "BlueSky Ransom\nPWNED!!! by Malvuln", "Code Exec PoC", MB_OK);  
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);  
return TRUE;  
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