chaos | 18888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
15-12-2024 13:57

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General

Target

FnClient.exe
Size

1.6MB
MD5

794aff3545f0ea50584adc40dd2f0896
SHA1

6130d56bf9ba1cbe320f0b24141b0c9491584d3f
SHA256

18888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988
SHA512

d7d9ca25f7535f10232b715ef5662f7316c512dc7da1036d3a31e77922fcaa30e5066fcf7142c743147e2d9aebdbf778be0390512a6f397c692118d7f11f1239
SSDEEP

12288:ofUX9SOQjN9wr5jpvkP3bap3WUkv9wO4ngeA4EoELzXKlfGba5hvMNGcxzY5Sqax:hAbIfIgJGRg85sPDr/VkJ4UB

Score

10^/10

chaos defense_evasion evasion execution impact 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/2488-7-0x00000000011A0000-0x0000000001336000-memory.dmp	family_chaos
behavioral1/files/0x00080000000120ff-6.dat	family_chaos
behavioral1/memory/2516-1-0x0000000001360000-0x00000000014F6000-memory.dmp	family_chaos

Chaos family
chaos
Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware defense_evasion impact execution

File Deletion
T1070.004

Inhibit System Recovery
T1490

Windows Management Instrumentation
T1047

Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs

ransomware evasion

Inhibit System Recovery

T1490

pid	Process
2096	bcdedit.exe
2100	bcdedit.exe

Deletes backup catalog 3 TTPs 1 IoCs

Uses wbadmin.exe to inhibit system recovery.

ransomware

Command and Scripting Interpreter

T1059

File Deletion

T1070.004

Inhibit System Recovery

T1490

pid	Process
992	wbadmin.exe

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_it.txt	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2488	svchost.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Drops desktop.ini file(s) 34 IoCs

description	ioc	Process
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Saved Games\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\Start Menu\Programs\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	svchost.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-3533259084-2542256011-65585152-1000\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Searches\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\Windows\Start Menu\Programs\Maintenance\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\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\Internet Explorer\Quick Launch\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Contacts\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\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\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\Public\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini	svchost.exe

Sets desktop wallpaper using registry 2 TTPs 2 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\7izxw3wbb.jpg"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Pictures\\My Wallpaper.jpg"	svchost.exe

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

System Information Discovery
T1082

Interacts with shadow copies 3 TTPs 1 IoCs

Shadow copies are often targeted by ransomware to inhibit system recovery.

ransomware

File Deletion

T1070.004

Inhibit System Recovery

T1490

Direct Volume Access

T1006

pid	Process
2136	vssadmin.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1088	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2488	svchost.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2516	FnClient.exe
2516	FnClient.exe
2516	FnClient.exe
2488	svchost.exe
2488	svchost.exe
2488	svchost.exe
2488	svchost.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeDebugPrivilege	2516	FnClient.exe
Token: SeDebugPrivilege	2488	svchost.exe
Token: SeBackupPrivilege	2472	vssvc.exe
Token: SeRestorePrivilege	2472	vssvc.exe
Token: SeAuditPrivilege	2472	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2988	WMIC.exe
Token: SeSecurityPrivilege	2988	WMIC.exe
Token: SeTakeOwnershipPrivilege	2988	WMIC.exe
Token: SeLoadDriverPrivilege	2988	WMIC.exe
Token: SeSystemProfilePrivilege	2988	WMIC.exe
Token: SeSystemtimePrivilege	2988	WMIC.exe
Token: SeProfSingleProcessPrivilege	2988	WMIC.exe
Token: SeIncBasePriorityPrivilege	2988	WMIC.exe
Token: SeCreatePagefilePrivilege	2988	WMIC.exe
Token: SeBackupPrivilege	2988	WMIC.exe
Token: SeRestorePrivilege	2988	WMIC.exe
Token: SeShutdownPrivilege	2988	WMIC.exe
Token: SeDebugPrivilege	2988	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2988	WMIC.exe
Token: SeRemoteShutdownPrivilege	2988	WMIC.exe
Token: SeUndockPrivilege	2988	WMIC.exe
Token: SeManageVolumePrivilege	2988	WMIC.exe
Token: 33	2988	WMIC.exe
Token: 34	2988	WMIC.exe
Token: 35	2988	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2988	WMIC.exe
Token: SeSecurityPrivilege	2988	WMIC.exe
Token: SeTakeOwnershipPrivilege	2988	WMIC.exe
Token: SeLoadDriverPrivilege	2988	WMIC.exe
Token: SeSystemProfilePrivilege	2988	WMIC.exe
Token: SeSystemtimePrivilege	2988	WMIC.exe
Token: SeProfSingleProcessPrivilege	2988	WMIC.exe
Token: SeIncBasePriorityPrivilege	2988	WMIC.exe
Token: SeCreatePagefilePrivilege	2988	WMIC.exe
Token: SeBackupPrivilege	2988	WMIC.exe
Token: SeRestorePrivilege	2988	WMIC.exe
Token: SeShutdownPrivilege	2988	WMIC.exe
Token: SeDebugPrivilege	2988	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2988	WMIC.exe
Token: SeRemoteShutdownPrivilege	2988	WMIC.exe
Token: SeUndockPrivilege	2988	WMIC.exe
Token: SeManageVolumePrivilege	2988	WMIC.exe
Token: 33	2988	WMIC.exe
Token: 34	2988	WMIC.exe
Token: 35	2988	WMIC.exe
Token: SeBackupPrivilege	320	wbengine.exe
Token: SeRestorePrivilege	320	wbengine.exe
Token: SeSecurityPrivilege	320	wbengine.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1088	NOTEPAD.EXE

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2488	2516	FnClient.exe	30
PID 2516 wrote to memory of 2488	2516	FnClient.exe	30
PID 2516 wrote to memory of 2488	2516	FnClient.exe	30
PID 2488 wrote to memory of 2644	2488	svchost.exe	32
PID 2488 wrote to memory of 2644	2488	svchost.exe	32
PID 2488 wrote to memory of 2644	2488	svchost.exe	32
PID 2644 wrote to memory of 2136	2644	cmd.exe	34
PID 2644 wrote to memory of 2136	2644	cmd.exe	34
PID 2644 wrote to memory of 2136	2644	cmd.exe	34
PID 2644 wrote to memory of 2988	2644	cmd.exe	37
PID 2644 wrote to memory of 2988	2644	cmd.exe	37
PID 2644 wrote to memory of 2988	2644	cmd.exe	37
PID 2488 wrote to memory of 1220	2488	svchost.exe	39
PID 2488 wrote to memory of 1220	2488	svchost.exe	39
PID 2488 wrote to memory of 1220	2488	svchost.exe	39
PID 1220 wrote to memory of 2096	1220	cmd.exe	41
PID 1220 wrote to memory of 2096	1220	cmd.exe	41
PID 1220 wrote to memory of 2096	1220	cmd.exe	41
PID 1220 wrote to memory of 2100	1220	cmd.exe	42
PID 1220 wrote to memory of 2100	1220	cmd.exe	42
PID 1220 wrote to memory of 2100	1220	cmd.exe	42
PID 2488 wrote to memory of 352	2488	svchost.exe	43
PID 2488 wrote to memory of 352	2488	svchost.exe	43
PID 2488 wrote to memory of 352	2488	svchost.exe	43
PID 352 wrote to memory of 992	352	cmd.exe	45
PID 352 wrote to memory of 992	352	cmd.exe	45
PID 352 wrote to memory of 992	352	cmd.exe	45
PID 2488 wrote to memory of 1088	2488	svchost.exe	49
PID 2488 wrote to memory of 1088	2488	svchost.exe	49
PID 2488 wrote to memory of 1088	2488	svchost.exe	49

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012
Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

C:\Users\Admin\AppData\Local\Temp\FnClient.exe
"C:\Users\Admin\AppData\Local\Temp\FnClient.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2516
- 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:2488
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2644
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:2136
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:2988
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1220
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2096
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2100
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:352
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:992
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    - Suspicious use of FindShellTrayWindow
    PID:1088

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2472

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:320

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:3044

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
PID:1084

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Management Instrumentation

T1047

Persistence

Privilege Escalation

Defense Evasion

Direct Volume Access

T1006

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Defacement

T1491

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

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

Filesize
1.6MB

MD5
794aff3545f0ea50584adc40dd2f0896

SHA1
6130d56bf9ba1cbe320f0b24141b0c9491584d3f

SHA256
18888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988

SHA512
d7d9ca25f7535f10232b715ef5662f7316c512dc7da1036d3a31e77922fcaa30e5066fcf7142c743147e2d9aebdbf778be0390512a6f397c692118d7f11f1239

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

Filesize
785B

MD5
d1bda10d6a8783f5d72eb4f2ac35abf8

SHA1
b9ae3b5f6c9082d66df9cfb07565a65820b2699a

SHA256
6a2196d66cd38e04d7699c2899dc60260e77c72faf009e8d6f2ba02b98df48af

SHA512
b860296368b255973c9aeaee652bfc3a3691aaacb4ed38623dc3f3453343d08de7a2eda44621684e35ef31a424fda6719c652a6fb378258764cacae53cb63a2d

Download Submit
memory/2488-16-0x000007FEF5DE0000-0x000007FEF67CC000-memory.dmp

Filesize
9.9MB

Download
memory/2488-9-0x000007FEF5DE0000-0x000007FEF67CC000-memory.dmp

Filesize
9.9MB

Download
memory/2488-7-0x00000000011A0000-0x0000000001336000-memory.dmp

Filesize
1.6MB

Download
memory/2488-438-0x000007FEF5DE0000-0x000007FEF67CC000-memory.dmp

Filesize
9.9MB

Download
memory/2516-1-0x0000000001360000-0x00000000014F6000-memory.dmp

Filesize
1.6MB

Download
memory/2516-0-0x000007FEF5DE3000-0x000007FEF5DE4000-memory.dmp

Filesize
4KB

Download