chaos | 2ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
22-03-2024 20:48

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General

Target

PrivateChat.exe
Size

122KB
MD5

a4960213baa07bad3f5762d38e68449b
SHA1

ea2db256e305d0a6f69dafd2e44047d3ad7cf553
SHA256

2ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2
SHA512

b56cbe5122392d83ce30ec3c06b5b871dae46ad5b30a6451621d4097e7a966e6d0028aafb9c98acc13c12ed115cb7c684c2cc0f30b04560fe5b0c746b5b836db
SSDEEP

3072:lo/cxr9jx+VURz6e8FxD5KwvsJC79fMomKgc0Io+ENK:Zr9jxVYe8FxlLB9kzIvE

Score

10^/10

chaos evasion 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/2360-0-0x0000000000860000-0x0000000000884000-memory.dmp	family_chaos
behavioral1/files/0x000a000000013a71-6.dat	family_chaos
behavioral1/memory/3052-7-0x0000000000170000-0x0000000000194000-memory.dmp	family_chaos

Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs

ransomware evasion

Inhibit System Recovery

T1490

pid	Process
2780	bcdedit.exe
2832	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
940	wbadmin.exe

Drops startup file 3 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
3052	PrivateChat.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\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Favorites\Links for United States\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Searches\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	PrivateChat.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-3627615824-4061627003-3019543961-1000\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	PrivateChat.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-1-5-21-3627615824-4061627003-3019543961-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\yomcb9os4.jpg"	PrivateChat.exe

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

System Information Discovery
T1082

Interacts with shadow copies 2 TTPs 1 IoCs

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

ransomware

File Deletion

T1070.004

Inhibit System Recovery

T1490

pid	Process
2744	vssadmin.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
2156	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3052	PrivateChat.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2360	PrivateChat.exe
2360	PrivateChat.exe
3052	PrivateChat.exe
3052	PrivateChat.exe
3052	PrivateChat.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeDebugPrivilege	2360	PrivateChat.exe
Token: SeDebugPrivilege	3052	PrivateChat.exe
Token: SeBackupPrivilege	2484	vssvc.exe
Token: SeRestorePrivilege	2484	vssvc.exe
Token: SeAuditPrivilege	2484	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2556	WMIC.exe
Token: SeSecurityPrivilege	2556	WMIC.exe
Token: SeTakeOwnershipPrivilege	2556	WMIC.exe
Token: SeLoadDriverPrivilege	2556	WMIC.exe
Token: SeSystemProfilePrivilege	2556	WMIC.exe
Token: SeSystemtimePrivilege	2556	WMIC.exe
Token: SeProfSingleProcessPrivilege	2556	WMIC.exe
Token: SeIncBasePriorityPrivilege	2556	WMIC.exe
Token: SeCreatePagefilePrivilege	2556	WMIC.exe
Token: SeBackupPrivilege	2556	WMIC.exe
Token: SeRestorePrivilege	2556	WMIC.exe
Token: SeShutdownPrivilege	2556	WMIC.exe
Token: SeDebugPrivilege	2556	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2556	WMIC.exe
Token: SeRemoteShutdownPrivilege	2556	WMIC.exe
Token: SeUndockPrivilege	2556	WMIC.exe
Token: SeManageVolumePrivilege	2556	WMIC.exe
Token: 33	2556	WMIC.exe
Token: 34	2556	WMIC.exe
Token: 35	2556	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2556	WMIC.exe
Token: SeSecurityPrivilege	2556	WMIC.exe
Token: SeTakeOwnershipPrivilege	2556	WMIC.exe
Token: SeLoadDriverPrivilege	2556	WMIC.exe
Token: SeSystemProfilePrivilege	2556	WMIC.exe
Token: SeSystemtimePrivilege	2556	WMIC.exe
Token: SeProfSingleProcessPrivilege	2556	WMIC.exe
Token: SeIncBasePriorityPrivilege	2556	WMIC.exe
Token: SeCreatePagefilePrivilege	2556	WMIC.exe
Token: SeBackupPrivilege	2556	WMIC.exe
Token: SeRestorePrivilege	2556	WMIC.exe
Token: SeShutdownPrivilege	2556	WMIC.exe
Token: SeDebugPrivilege	2556	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2556	WMIC.exe
Token: SeRemoteShutdownPrivilege	2556	WMIC.exe
Token: SeUndockPrivilege	2556	WMIC.exe
Token: SeManageVolumePrivilege	2556	WMIC.exe
Token: 33	2556	WMIC.exe
Token: 34	2556	WMIC.exe
Token: 35	2556	WMIC.exe
Token: SeBackupPrivilege	2864	wbengine.exe
Token: SeRestorePrivilege	2864	wbengine.exe
Token: SeSecurityPrivilege	2864	wbengine.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2360 wrote to memory of 3052	2360	PrivateChat.exe	28
PID 2360 wrote to memory of 3052	2360	PrivateChat.exe	28
PID 2360 wrote to memory of 3052	2360	PrivateChat.exe	28
PID 3052 wrote to memory of 2572	3052	PrivateChat.exe	30
PID 3052 wrote to memory of 2572	3052	PrivateChat.exe	30
PID 3052 wrote to memory of 2572	3052	PrivateChat.exe	30
PID 2572 wrote to memory of 2744	2572	cmd.exe	32
PID 2572 wrote to memory of 2744	2572	cmd.exe	32
PID 2572 wrote to memory of 2744	2572	cmd.exe	32
PID 2572 wrote to memory of 2556	2572	cmd.exe	35
PID 2572 wrote to memory of 2556	2572	cmd.exe	35
PID 2572 wrote to memory of 2556	2572	cmd.exe	35
PID 3052 wrote to memory of 2672	3052	PrivateChat.exe	37
PID 3052 wrote to memory of 2672	3052	PrivateChat.exe	37
PID 3052 wrote to memory of 2672	3052	PrivateChat.exe	37
PID 2672 wrote to memory of 2780	2672	cmd.exe	39
PID 2672 wrote to memory of 2780	2672	cmd.exe	39
PID 2672 wrote to memory of 2780	2672	cmd.exe	39
PID 2672 wrote to memory of 2832	2672	cmd.exe	40
PID 2672 wrote to memory of 2832	2672	cmd.exe	40
PID 2672 wrote to memory of 2832	2672	cmd.exe	40
PID 3052 wrote to memory of 2848	3052	PrivateChat.exe	41
PID 3052 wrote to memory of 2848	3052	PrivateChat.exe	41
PID 3052 wrote to memory of 2848	3052	PrivateChat.exe	41
PID 2848 wrote to memory of 940	2848	cmd.exe	43
PID 2848 wrote to memory of 940	2848	cmd.exe	43
PID 2848 wrote to memory of 940	2848	cmd.exe	43
PID 3052 wrote to memory of 2156	3052	PrivateChat.exe	47
PID 3052 wrote to memory of 2156	3052	PrivateChat.exe	47
PID 3052 wrote to memory of 2156	3052	PrivateChat.exe	47

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\PrivateChat.exe
"C:\Users\Admin\AppData\Local\Temp\PrivateChat.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2360
- C:\Users\Admin\AppData\Roaming\PrivateChat.exe
  "C:\Users\Admin\AppData\Roaming\PrivateChat.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:3052
- - 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:2572
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:2744
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:2556
- - 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:2672
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2780
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2832
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2848
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:940
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\MUSTREAD.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:2156

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2484

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2864

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2816

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
PID:1820

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Persistence

Privilege Escalation

Defense Evasion

Indicator Removal

T1070

File Deletion

T1070.004

Modify Registry

T1112

Credential Access

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\PrivateChat.exe

Filesize
122KB

MD5
a4960213baa07bad3f5762d38e68449b

SHA1
ea2db256e305d0a6f69dafd2e44047d3ad7cf553

SHA256
2ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2

SHA512
b56cbe5122392d83ce30ec3c06b5b871dae46ad5b30a6451621d4097e7a966e6d0028aafb9c98acc13c12ed115cb7c684c2cc0f30b04560fe5b0c746b5b836db

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

Filesize
510B

MD5
08dd3f6950280cf6839b09c5a090f70a

SHA1
13d8c41b481b7b2cc885c06a83e979d57fd470b0

SHA256
3a58a8f73b2c6c44f573d4538b990843840514ee0c76ff3ea00dd152d2c95c36

SHA512
ca5fa6803741d00f32712241109e46bc311b29d2adb2bd2a4f2f2829d86a10d583bc0bc6fdc96f6061da435c5b4304802867c31bd60d59449e8b79df50757ebe

Download Submit
memory/2360-0-0x0000000000860000-0x0000000000884000-memory.dmp

Filesize
144KB

Download
memory/2360-1-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-422-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

Filesize
9.9MB

Download
memory/3052-7-0x0000000000170000-0x0000000000194000-memory.dmp

Filesize
144KB

Download
memory/3052-8-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

Filesize
9.9MB

Download
memory/3052-10-0x000000001AE60000-0x000000001AEE0000-memory.dmp

Filesize
512KB

Download
memory/3052-423-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

Filesize
9.9MB

Download