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List:       full-disclosure
Subject:    [FD] Yashma Ransomware Builder v1.2 / Insecure Permissions
From:       malvuln <malvuln13 () gmail ! com>
Date:       2022-06-24 2:28:30
Message-ID: CAAHK0WReAS+2p2PSQ8Hdvyi0Hf6EMa4bufxtq2QzsX8B0ByUsw () mail ! gmail ! com
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Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/13e878ed7e547523cffc5728f6ba4190.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Yashma Ransomware Builder v1.2
Vulnerability: Insecure Permissions
Description: The malware creates PE files with insecure permissions when
writing to c:\ drive, granting change (C) permissions to the authenticated
user group. Standard users can rename the executable dropped by the malware
to disable it or replace it with their own executable. Then wait for a
privileged user to logon to the infected machine to potentially escalate
privileges.
Family: Yashma
Type: PE32
MD5: 13e878ed7e547523cffc5728f6ba4190
Vuln ID: MVID-2022-0613
Disclosure: 06/23/2022


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


C:\>dir hate.exe
 Volume in drive C has no label.

 Directory of C:\

05/14/2022  01:20 AM            54,784 hate.exe
               1 File(s)         54,784 bytes


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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