chaos | 18888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988

Analysis

max time kernel
96s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
15-12-2024 12:52

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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 2 IoCs

resource	yara_rule
behavioral2/memory/4912-1-0x0000000000930000-0x0000000000AC6000-memory.dmp	family_chaos
behavioral2/files/0x0032000000023b75-6.dat	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
4152	bcdedit.exe
4188	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
3488	wbadmin.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	FnClient.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	svchost.exe

Drops startup file 3 IoCs

description	ioc	Process
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
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2436	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\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\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\OneDrive\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\Internet Explorer\Quick Launch\User Pinned\TaskBar\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\Libraries\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Videos\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\Pictures\Saved Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\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\Programs\System Tools\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Pictures\Camera Roll\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Desktop\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\Music\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\Start Menu\Programs\Maintenance\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	svchost.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-3350944739-639801879-157714471-1000\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Contacts\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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\i75vrlxhg.jpg"	svchost.exe

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

System Information Discovery
T1082

Checks SCSI registry key(s) 3 TTPs 4 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName	vds.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName	vds.exe

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
2204	vssadmin.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	svchost.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1668	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2436	svchost.exe

Suspicious behavior: EnumeratesProcesses 47 IoCs

pid	Process
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
4912	FnClient.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe
2436	svchost.exe

Suspicious use of AdjustPrivilegeToken 50 IoCs

description	pid	Process
Token: SeDebugPrivilege	4912	FnClient.exe
Token: SeDebugPrivilege	2436	svchost.exe
Token: SeBackupPrivilege	3364	vssvc.exe
Token: SeRestorePrivilege	3364	vssvc.exe
Token: SeAuditPrivilege	3364	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2056	WMIC.exe
Token: SeSecurityPrivilege	2056	WMIC.exe
Token: SeTakeOwnershipPrivilege	2056	WMIC.exe
Token: SeLoadDriverPrivilege	2056	WMIC.exe
Token: SeSystemProfilePrivilege	2056	WMIC.exe
Token: SeSystemtimePrivilege	2056	WMIC.exe
Token: SeProfSingleProcessPrivilege	2056	WMIC.exe
Token: SeIncBasePriorityPrivilege	2056	WMIC.exe
Token: SeCreatePagefilePrivilege	2056	WMIC.exe
Token: SeBackupPrivilege	2056	WMIC.exe
Token: SeRestorePrivilege	2056	WMIC.exe
Token: SeShutdownPrivilege	2056	WMIC.exe
Token: SeDebugPrivilege	2056	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2056	WMIC.exe
Token: SeRemoteShutdownPrivilege	2056	WMIC.exe
Token: SeUndockPrivilege	2056	WMIC.exe
Token: SeManageVolumePrivilege	2056	WMIC.exe
Token: 33	2056	WMIC.exe
Token: 34	2056	WMIC.exe
Token: 35	2056	WMIC.exe
Token: 36	2056	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2056	WMIC.exe
Token: SeSecurityPrivilege	2056	WMIC.exe
Token: SeTakeOwnershipPrivilege	2056	WMIC.exe
Token: SeLoadDriverPrivilege	2056	WMIC.exe
Token: SeSystemProfilePrivilege	2056	WMIC.exe
Token: SeSystemtimePrivilege	2056	WMIC.exe
Token: SeProfSingleProcessPrivilege	2056	WMIC.exe
Token: SeIncBasePriorityPrivilege	2056	WMIC.exe
Token: SeCreatePagefilePrivilege	2056	WMIC.exe
Token: SeBackupPrivilege	2056	WMIC.exe
Token: SeRestorePrivilege	2056	WMIC.exe
Token: SeShutdownPrivilege	2056	WMIC.exe
Token: SeDebugPrivilege	2056	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2056	WMIC.exe
Token: SeRemoteShutdownPrivilege	2056	WMIC.exe
Token: SeUndockPrivilege	2056	WMIC.exe
Token: SeManageVolumePrivilege	2056	WMIC.exe
Token: 33	2056	WMIC.exe
Token: 34	2056	WMIC.exe
Token: 35	2056	WMIC.exe
Token: 36	2056	WMIC.exe
Token: SeBackupPrivilege	3208	wbengine.exe
Token: SeRestorePrivilege	3208	wbengine.exe
Token: SeSecurityPrivilege	3208	wbengine.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4912 wrote to memory of 2436	4912	FnClient.exe	83
PID 4912 wrote to memory of 2436	4912	FnClient.exe	83
PID 2436 wrote to memory of 2380	2436	svchost.exe	91
PID 2436 wrote to memory of 2380	2436	svchost.exe	91
PID 2380 wrote to memory of 2204	2380	cmd.exe	93
PID 2380 wrote to memory of 2204	2380	cmd.exe	93
PID 2380 wrote to memory of 2056	2380	cmd.exe	97
PID 2380 wrote to memory of 2056	2380	cmd.exe	97
PID 2436 wrote to memory of 4920	2436	svchost.exe	98
PID 2436 wrote to memory of 4920	2436	svchost.exe	98
PID 4920 wrote to memory of 4152	4920	cmd.exe	100
PID 4920 wrote to memory of 4152	4920	cmd.exe	100
PID 4920 wrote to memory of 4188	4920	cmd.exe	101
PID 4920 wrote to memory of 4188	4920	cmd.exe	101
PID 2436 wrote to memory of 4356	2436	svchost.exe	102
PID 2436 wrote to memory of 4356	2436	svchost.exe	102
PID 4356 wrote to memory of 3488	4356	cmd.exe	104
PID 4356 wrote to memory of 3488	4356	cmd.exe	104
PID 2436 wrote to memory of 1668	2436	svchost.exe	109
PID 2436 wrote to memory of 1668	2436	svchost.exe	109

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⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4912
- C:\Users\Admin\AppData\Roaming\svchost.exe
  "C:\Users\Admin\AppData\Roaming\svchost.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Drops desktop.ini file(s)
  - Sets desktop wallpaper using registry
  - Modifies registry class
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2436
- - 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:2380
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:2204
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:2056
- - 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:4920
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:4152
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:4188
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4356
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:3488
- - 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)
    PID:1668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3364

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3208

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2872

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
- Checks SCSI registry key(s)
PID:4176

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

Peripheral Device Discovery

T1120

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/2436-14-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/2436-440-0x00007FFE00F30000-0x00007FFE019F1000-memory.dmp

Filesize
10.8MB

Download
memory/4912-0-0x00007FFE00F33000-0x00007FFE00F35000-memory.dmp

Filesize
8KB

Download
memory/4912-1-0x0000000000930000-0x0000000000AC6000-memory.dmp

Filesize
1.6MB

Download