Malware Analysis Report

2024-08-06 16:04

Sample ID 240423-29ht9acf7w
Target bow.exe
SHA256 001b2843e0af153d71b373962b2c0cf431cf1177b86be8be372717d620495640
Tags
chaos ransomware spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

001b2843e0af153d71b373962b2c0cf431cf1177b86be8be372717d620495640

Threat Level: Known bad

The file bow.exe was found to be: Known bad.

Malicious Activity Summary

chaos ransomware spyware stealer

Chaos family

Chaos Ransomware

Chaos

Reads user/profile data of web browsers

Drops startup file

Executes dropped EXE

Checks computer location settings

Drops desktop.ini file(s)

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Modifies registry class

Opens file in notepad (likely ransom note)

Suspicious behavior: GetForegroundWindowSpam

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: AddClipboardFormatListener

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of SetWindowsHookEx

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Privilege Escalation
TA0004
Defense Evasion
TA0005
Credential Access
TA0006
Unsecured Credentials
T1552
Credentials In Files
T1552.001
Discovery
TA0007
Query Registry
T1012
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Data from Local System
T1005
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-04-23 23:16

Signatures

Chaos Ransomware

Description Indicator Process Target
N/A N/A N/A N/A

Chaos family

chaos

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-23 23:16

Reported

2024-04-23 23:19

Platform

win10v2004-20240412-en

Max time kernel

139s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bow.exe"

Signatures

Chaos

ransomware chaos

Chaos Ransomware

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-2177723727-746291240-1644359950-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-2177723727-746291240-1644359950-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Reads user/profile data of web browsers

spyware stealer

Drops desktop.ini file(s)

Description Indicator Process Target
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Public\Documents\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Public\Pictures\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Public\Desktop\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Documents\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Music\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Saved Games\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Searches\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Public\Videos\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Contacts\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Favorites\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Public\Music\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Desktop\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Pictures\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\OneDrive\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification F:\$RECYCLE.BIN\S-1-5-21-2177723727-746291240-1644359950-1000\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Links\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Downloads\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\Videos\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-2177723727-746291240-1644359950-1000_Classes\Local Settings C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Opens file in notepad (likely ransom note)

ransomware
Description Indicator Process Target
N/A N/A C:\Windows\system32\NOTEPAD.EXE N/A
N/A N/A C:\Windows\system32\NOTEPAD.EXE N/A

Suspicious behavior: AddClipboardFormatListener

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\bow.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Program Files\VideoLAN\VLC\vlc.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 540 wrote to memory of 4004 N/A C:\Users\Admin\AppData\Local\Temp\bow.exe C:\Users\Admin\AppData\Roaming\svchost.exe
PID 540 wrote to memory of 4004 N/A C:\Users\Admin\AppData\Local\Temp\bow.exe C:\Users\Admin\AppData\Roaming\svchost.exe
PID 4004 wrote to memory of 3128 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\system32\NOTEPAD.EXE
PID 4004 wrote to memory of 3128 N/A C:\Users\Admin\AppData\Roaming\svchost.exe C:\Windows\system32\NOTEPAD.EXE

Processes

C:\Users\Admin\AppData\Local\Temp\bow.exe

"C:\Users\Admin\AppData\Local\Temp\bow.exe"

C:\Users\Admin\AppData\Roaming\svchost.exe

"C:\Users\Admin\AppData\Roaming\svchost.exe"

C:\Windows\system32\NOTEPAD.EXE

"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt

C:\Program Files\VideoLAN\VLC\vlc.exe

"C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\ResumeMove.aiff"

C:\Windows\system32\NOTEPAD.EXE

"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Public\Desktop\read_it.txt

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 198.32.209.4.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 144.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 14.251.17.2.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp

Files

memory/540-0-0x0000000000330000-0x000000000033C000-memory.dmp

memory/540-1-0x00007FFEFB0F0000-0x00007FFEFBBB1000-memory.dmp

C:\Users\Admin\AppData\Roaming\svchost.exe

MD5 9c521c4bc50477b65e51b8c027779b57
SHA1 e9f86154e35c597957be6a47e04ec3f8ca355081
SHA256 001b2843e0af153d71b373962b2c0cf431cf1177b86be8be372717d620495640
SHA512 bf8e44e139fe0c44e47ac182f736e02f0d28222a254883e9e9de6c737ebe1eff5216ea7efdddd1a6b59b06065a7a7afb4f39d7bfda46697b9d67e7aa924335d8

memory/540-14-0x00007FFEFB0F0000-0x00007FFEFBBB1000-memory.dmp

memory/4004-15-0x00007FFEFB0F0000-0x00007FFEFBBB1000-memory.dmp

C:\Users\Admin\Desktop\read_it.txt

MD5 e0b9afe0300098926f26d8c87779b6c3
SHA1 4379bc495053f324fbcba749bd67f12dd3720255
SHA256 38e09652d450eec8ea0898d454ec538f2d0472f17e439b872bfa1b9b3d20ca7c
SHA512 86eabcda01223180a9bca3351257646a6d53681ea5c79383dd5244a2e5cd3ccdd2647ce883cce61178bc689852781b776d0412f5459a56abcc0cffdf21731f3d

memory/2436-86-0x00007FF660C90000-0x00007FF660D88000-memory.dmp

memory/2436-87-0x00007FFEF47C0000-0x00007FFEF47F4000-memory.dmp

memory/2436-88-0x00007FFEF1890000-0x00007FFEF1B46000-memory.dmp

memory/2436-89-0x00007FFEF07E0000-0x00007FFEF1890000-memory.dmp

memory/2436-90-0x00007FFEF00B0000-0x00007FFEF01BE000-memory.dmp

memory/4004-91-0x00007FFEFB0F0000-0x00007FFEFBBB1000-memory.dmp