A Proof of Idea With Doubtlessly Harmful Functions

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Chaos Ransomware: A Proof of Idea With Doubtlessly Harmful Functions

Ransomware

Since June 2021, we’ve been monitoring an in-development ransomware builder known as Chaos, which is being supplied for testing on an underground discussion board.
By: Monte de Jesus, Don Ovid Ladores

August 10, 2021

Learn time:  ( phrases)

Since June 2021, we’ve been monitoring an in-development ransomware builder known as Chaos, which is being supplied for testing on an underground discussion board. Whereas it’s purportedly a .NET model of Ryuk, nearer examination of the pattern reveals that it doesn’t share a lot with the infamous ransomware. Actually, early variations of Chaos, which is now in its fourth iteration, had been extra akin to a damaging trojan than to conventional ransomware.
On this weblog entry, we check out a number of the traits of the Chaos ransomware builder and the way its iterations added new capabilities.

Chaos has undergone speedy evolution from its very first model to its present iteration, with model 1.0 having been launched on June 9, model 2.0 on June 17, model 3.0 on July 5, and model 4.0 on Aug. 5.

Determine 1. The GUI of Chaos model 1.0

Probably the most notable attribute of the primary model of the Chaos builder was that, regardless of having the Ryuk branding in its GUI, it had little in frequent with the ransomware. Actually, it wasn’t even conventional ransomware, however relatively a damaging trojan. As an alternative of encrypting recordsdata (which may then be decrypted after the goal paid the ransom), it changed the recordsdata’ contents with random bytes, after which the recordsdata had been encoded in Base64. This meant that affected recordsdata may now not be restored, offering victims no incentive to pay the ransom.
It did, nonetheless, show sure traits present in different ransomware households. For instance, it searched the next file paths and extensions to contaminate:

Contacts
Desktop
Desktop
Paperwork
Downloads
Favorites
Hyperlinks
Music
OneDrive
Footage
Saved Video games
Searches
Movies

.3gp
.7z
.7-zip
.accdb
.ace
.amv
.apk
.arj
.asp
.aspx
.avi
.backup
.bak
.bay
.bk
.blob
.bmp
.bz2
.cab
.cer
.contact
.core
.cpp
.crt
.cs
.css
.csv
.dat
.db
.dll
.doc
.docm
.docx
.dwg
.exif
.flv
.gzip
.htm
.html
.ibank
.ico
.ini
.iso
.jar
.java
.jpe
.jpeg
.jpg
.js
.json
.jsp
.lnk
.lzh
.m4a
.m4p
.m4v
.mdb
.mkv
.mov
.mp3
.mp3
.mp3
.mp4
.mpeg
.mpg
.ods
.odt
.p7c
.pas
.pdb
.pdf
.php
.png
.ppt
.pptx
.psd
.py
.rar
.rb
.rtf
.settings
.sie
.sql
.sum
.svg
.tar
.txt
.vdi
.vmdk
.pockets
.wav
.webm
.wma
.wmv
.wps
.xls
.xlsb
.xlsm
.xlsx
.xml
.xz
.zip

It then dropped a ransomware observe named read_it.txt, with a requirement for a relatively sizeable ransom in bitcoin.

Determine 2. A ransom observe dropped by Chaos

One of many extra attention-grabbing capabilities of Chaos model 1.0 was its worming operate, which allowed it to unfold to all drives discovered on an affected system. This might allow the malware to leap onto detachable drives and escape from air-gapped programs.

Determine 3. Code displaying the worming operate

The second model of Chaos added superior choices for administrator privileges, the flexibility to delete all quantity shadow copies and the backup catalog, and the flexibility to disable Home windows restoration mode.
Nonetheless, model 2.0 nonetheless overwrote the recordsdata of its targets. Members of the discussion board the place it was posted identified that victims wouldn’t pay the ransom if their recordsdata couldn’t be restored.

Determine 4. The GUI of Chaos model 2.0

With model 3.0, the Chaos ransomware builder gained the flexibility to encrypt recordsdata underneath 1 MB utilizing AES/RSA encryption, making it extra in keeping with conventional ransomware. It additionally got here with its personal decrypter builder.

Determine 5. The GUI of Chaos model 3.0

Determine 6. The superior choices for Chaos model 3.0, together with the choice to encrypt recordsdata through the AES/RSA methodology and the decrypter builder operate

The fourth iteration of Chaos expands the AES/RSA encryption by rising the higher restrict of recordsdata that may be encrypted to 2 MB. As well as, it offers the ransomware builder’s customers the flexibility so as to add their very own extensions to affected recordsdata and the flexibility to vary the desktop wallpaper of their victims.

Determine 7. The superior choices for Chaos model 4.0, together with the choice to vary desktop wallpapers

We haven’t seen any energetic infections or victims of the Chaos ransomware. Nonetheless, within the arms of a malicious actor who has entry to malware distribution and deployment infrastructure, it may trigger nice harm to organizations.
In our view, the Chaos ransomware builder continues to be removed from being a completed product because it lacks options that many fashionable ransomware households possess, resembling the flexibility to gather information from victims that could possibly be used for additional blackmail if the ransom isn’t paid.

The next are the hashes and our detections for the totally different Chaos ransomware builder variations:

SHA-256

Detection

TrendX detection

Model

0d8b4a07e91e02335f600332644e8f0e504f75ab19899a58b2c85ecb0887c738

Trojan.MSIL.FAKERYUKBUILD.THFAFBA

N/A

Chaos Ransomware builder model 1.0

325dfac6172cd279715ca8deb280eefe3544090f1583a2ddb5d43fc7fe3029ed

Trojan.MSIL.FAKERYUKBUILDER.AA

Ransom.Win32.TRX.XXPE50FFF046E0002

Chaos Ransomware builder model 2.0

63e28fc93b5843002279fc2ad6fabd9a2bc7f5d2f0b59910bcc447a21673e6c7

Trojan.MSIL.FAKERYUKBUILDER.AA

Ransom.Win32.TRX.XXPE50FFF046E0002

Chaos Ransomware builder model 3.0

f2665f89ba53abd3deb81988c0d5194992214053e77fc89b98b64a31a7504d77

Trojan.MSIL.FAKERYUKBUILD.THFAFBA

N/A

Chaos Ransomware builder model 4.0

We additionally proactively detect the next parts:

Detection

Observe

Ransom.MSIL.CHAOSBUILDER.SMYPBHET

Chaos ransomware builder and decrypter

Ransom.MSIL.CHAOS.SMYPBHET

Principal Chaos ransomware executable

PUA.MSIL.CHAOS.SMYPBHET.decryptor

Chaos ransomware decrypter

Tags

sXpIBdPeKzI9PC2p0SWMpUSM2NSxWzPyXTMLlbXmYa0R20xk

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