Backdoor.Win32.Agent.xs Insecure Permissions ≈ Packet Storm – Digitalmunition




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Published on February 25th, 2021 📆 | 8556 Views ⚑

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Backdoor.Win32.Agent.xs Insecure Permissions ≈ Packet Storm

Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6c51a5ba17ffd317ad08541e20131ef3.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.xs
Vulnerability: Insecure Permissions
Description: The malware creates a hidden but insecure dir named “Recycler” under c: drive and grants change (C) permissions to the authenticated user group. It also drops an exe named “explorer.exe”, standard users can rename the malware and reboot to disable it or replace with their own executable to escalate privileges when a privileged user logs on to the infected machine.
Type: PE32
MD5: 6c51a5ba17ffd317ad08541e20131ef3
Vuln ID: MVID-2021-0106
Dropped files: explorer.exe
Disclosure: 02/23/2021

Exploit/PoC:
void main(void){

puts(“[+] Unhiding the malware to rename it…”);
system(“attrib -h C:\Recycler\explorer.exe”);
system(“RENAME C:\Recycler\explorer.exe 13”);

Sleep(1000);

printf(“[+] Disabled by renaming C:\Recycler\explorer.exe to 13 …n”);
printf(“[+] Restart your computer …n”);

Sleep(1000);

puts(“[+] Backdoor.Win32.Agent.xs PWNED!”);
puts(“[+] MD5: 6c51a5ba17ffd317ad08541e20131ef3”);
puts(“[+] By Malvuln”);
system(“pause”);

}

C:>cacls Recycler
C:Recycler BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

C:>dir /a Recycler
Volume in drive C has no label.

Directory of C:Recycler

02/16/2021 04:19 PM

.
02/16/2021 04:19 PM
..
02/16/2021 04:19 PM 77,824 explorer.exe
1 File(s) 77,824 bytes
2 Dir(s) 62,863,994,880 bytes free

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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