chaos | 275856a4945996b6b6c211a0835ac1443549d76ebed9eb0e7b9a7711d44fe49b

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
14-05-2024 14:34

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General

Target

923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe
Size

713KB
MD5

4bff5ddaa43a2342fdd1bbae21522141
SHA1

f3b5c279fa1b9c7abb03e2a11c2c3965ef9eb8d3
SHA256

923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2
SHA512

f184cdeafabdb214564a7f90b2f3b60e1e2c8f70769e6679e2bd75243d02e83b69b27021a7fce2e58719537b3cff4b010a2007b4441d25d6fde6553d4801237e
SSDEEP

12288:hA7D8KKjkzC1Xa7e5HSyOXxlktEWFJF1XLpXLFLSiC56JHOtDmcIJAVcZ3BAT2kb:P4mWopxZJAT

Score

10^/10

chaos ransomware spyware stealer

Malware Config

Signatures

Chaos
Ransomware family first seen in June 2021.
ransomware chaos

Chaos Ransomware 3 IoCs

resource	yara_rule
behavioral1/memory/3020-1-0x0000000000ED0000-0x0000000000F88000-memory.dmp	family_chaos
behavioral1/files/0x000c00000001228a-5.dat	family_chaos
behavioral1/memory/2984-7-0x0000000001340000-0x00000000013F8000-memory.dmp	family_chaos

Renames multiple (215) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Drops startup file 3 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini	svchost.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\READ_ME_USER.txt	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2984	svchost.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Drops desktop.ini file(s) 34 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\Links for United States\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	svchost.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-481678230-3773327859-3495911762-1000\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Searches\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini	svchost.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\37v0htrt7.jpg"	svchost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
2360	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2984	svchost.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe
3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe
2984	svchost.exe
2984	svchost.exe
2984	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe
Token: SeDebugPrivilege	2984	svchost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 2984	3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe	28
PID 3020 wrote to memory of 2984	3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe	28
PID 3020 wrote to memory of 2984	3020	923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe	28
PID 2984 wrote to memory of 2360	2984	svchost.exe	30
PID 2984 wrote to memory of 2360	2984	svchost.exe	30
PID 2984 wrote to memory of 2360	2984	svchost.exe	30

C:\Users\Admin\AppData\Local\Temp\923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe
"C:\Users\Admin\AppData\Local\Temp\923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3020
- C:\Users\Admin\AppData\Roaming\svchost.exe
  "C:\Users\Admin\AppData\Roaming\svchost.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Drops desktop.ini file(s)
  - Sets desktop wallpaper using registry
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2984
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\READ_ME_USER.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:2360

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Defacement

T1491

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Downloads

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

Filesize
713KB

MD5
4bff5ddaa43a2342fdd1bbae21522141

SHA1
f3b5c279fa1b9c7abb03e2a11c2c3965ef9eb8d3

SHA256
923dddc478a17d0adf0c86d1b5eb709ea4b48114cbb2c0e72052bd69caae95b2

SHA512
f184cdeafabdb214564a7f90b2f3b60e1e2c8f70769e6679e2bd75243d02e83b69b27021a7fce2e58719537b3cff4b010a2007b4441d25d6fde6553d4801237e

Download Submit
C:\Users\Admin\Documents\READ_ME_USER.txt

Filesize
1017B

MD5
2df0c97cb7d6a2792d3111a276192d36

SHA1
141580fbfb6385e00eff2dd3880e321844acbebd

SHA256
52ad64843efc73a4a6c646f94e1eb29b4d212a7a4e4e999f7efe2bfe0455293b

SHA512
209edb419c059188e8bf407ce1670c153b7b7ad7288e5b11f8a6271b55087ea76463dc0394c4b57d82f0b517e08980073da57dd71066a04cc9a9d708e7bd8aba

Download Submit
memory/2984-7-0x0000000001340000-0x00000000013F8000-memory.dmp

Filesize
736KB

Download
memory/2984-27-0x000007FEF5290000-0x000007FEF5C7C000-memory.dmp

Filesize
9.9MB

Download
memory/2984-34-0x000007FEF5290000-0x000007FEF5C7C000-memory.dmp

Filesize
9.9MB

Download
memory/2984-494-0x000007FEF5290000-0x000007FEF5C7C000-memory.dmp

Filesize
9.9MB

Download
memory/3020-0-0x000007FEF5293000-0x000007FEF5294000-memory.dmp

Filesize
4KB

Download
memory/3020-1-0x0000000000ED0000-0x0000000000F88000-memory.dmp

Filesize
736KB

Download