full-disclosure - [FD] Ransom.Win64.AtomSilo / Crypto Logic Flaw

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Message-ID: <CAAHK0WTwZvt1yhU5nKdQ0W0WVbWK=_-PJksgVaGddEUfCP4MNQ@mail.gmail.com>
Date: Wed, 14 Dec 2022 00:47:32 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Ransom.Win64.AtomSilo / Crypto Logic Flaw

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/5559e9f5e1645f8554ea020a29a5a3ee.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln
Backup media: infosec.exchange/@...vuln

Threat: Ransom.Win64.AtomSilo
Vulnerability: Crypto Logic Flaw
Family: AtomSilo
Type: PE64
MD5: 5559e9f5e1645f8554ea020a29a5a3ee
Vuln ID: MVID-2022-0666
Disclosure: 12/14/2022
Description: AtomSilo ransomware FAILS to encrypt non PE files that have a
".exe" in the filename. Creating specially crafted file names successfully
evaded encryption for this malware sample.

E.g.

Test.exe.docx
Test.exe.pdf

Tested successfully in a virtual machine environment.

PoC Video:
https://www.youtube.com/watch?v=xyBt9Ppb-xc

Exploit/PoC:
Create files with ".exe" within the filename.

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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