chaos | 19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32

Analysis

max time kernel
121s
max time network
125s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
22-03-2024 21:20

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General

Target

PrivateChat.exe
Size

120KB
MD5

5d4c5f3457c4487fe26df768ed8f3d2b
SHA1

f5f3df7d11e06dc158ac8183a8bde5895f8ea251
SHA256

19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32
SHA512

793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a
SSDEEP

3072:QoIcFr9LvJxaJ3e6ua0g0qcB2f/u80kcmU/C7eJBz4Jtu:dr9LvkbOqguxU6f4

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/2228-0-0x0000000000EE0000-0x0000000000F04000-memory.dmp	family_chaos
behavioral1/files/0x000900000001224c-5.dat	family_chaos
behavioral1/memory/2392-7-0x0000000000A70000-0x0000000000A94000-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
848	bcdedit.exe
2072	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
2056	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\README.txt	PrivateChat.exe

Executes dropped EXE 1 IoCs

pid	Process
2392	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\Favorites\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Searches\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\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Contacts\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\Public\Pictures\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\Public\Desktop\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Documents\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\Start Menu\Programs\Accessories\Accessibility\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\Admin\Videos\desktop.ini	PrivateChat.exe
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\Programs\Maintenance\Desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	PrivateChat.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-330940541-141609230-1670313778-1000\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\Admin\Desktop\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	PrivateChat.exe
File opened for modification	C:\Users\Public\Documents\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\Pictures\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\Links\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\AppData\Roaming\Microsoft\Windows\Recent\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

Sets desktop wallpaper using registry 2 TTPs 2 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\f00xkdn4c.jpg"	PrivateChat.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Pictures\\My Wallpaper.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
1896	vssadmin.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1552	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2392	PrivateChat.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2228	PrivateChat.exe
2228	PrivateChat.exe
2228	PrivateChat.exe
2392	PrivateChat.exe
2392	PrivateChat.exe
2392	PrivateChat.exe
2392	PrivateChat.exe
2392	PrivateChat.exe
2392	PrivateChat.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeDebugPrivilege	2228	PrivateChat.exe
Token: SeDebugPrivilege	2392	PrivateChat.exe
Token: SeBackupPrivilege	1824	vssvc.exe
Token: SeRestorePrivilege	1824	vssvc.exe
Token: SeAuditPrivilege	1824	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2712	WMIC.exe
Token: SeSecurityPrivilege	2712	WMIC.exe
Token: SeTakeOwnershipPrivilege	2712	WMIC.exe
Token: SeLoadDriverPrivilege	2712	WMIC.exe
Token: SeSystemProfilePrivilege	2712	WMIC.exe
Token: SeSystemtimePrivilege	2712	WMIC.exe
Token: SeProfSingleProcessPrivilege	2712	WMIC.exe
Token: SeIncBasePriorityPrivilege	2712	WMIC.exe
Token: SeCreatePagefilePrivilege	2712	WMIC.exe
Token: SeBackupPrivilege	2712	WMIC.exe
Token: SeRestorePrivilege	2712	WMIC.exe
Token: SeShutdownPrivilege	2712	WMIC.exe
Token: SeDebugPrivilege	2712	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2712	WMIC.exe
Token: SeRemoteShutdownPrivilege	2712	WMIC.exe
Token: SeUndockPrivilege	2712	WMIC.exe
Token: SeManageVolumePrivilege	2712	WMIC.exe
Token: 33	2712	WMIC.exe
Token: 34	2712	WMIC.exe
Token: 35	2712	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2712	WMIC.exe
Token: SeSecurityPrivilege	2712	WMIC.exe
Token: SeTakeOwnershipPrivilege	2712	WMIC.exe
Token: SeLoadDriverPrivilege	2712	WMIC.exe
Token: SeSystemProfilePrivilege	2712	WMIC.exe
Token: SeSystemtimePrivilege	2712	WMIC.exe
Token: SeProfSingleProcessPrivilege	2712	WMIC.exe
Token: SeIncBasePriorityPrivilege	2712	WMIC.exe
Token: SeCreatePagefilePrivilege	2712	WMIC.exe
Token: SeBackupPrivilege	2712	WMIC.exe
Token: SeRestorePrivilege	2712	WMIC.exe
Token: SeShutdownPrivilege	2712	WMIC.exe
Token: SeDebugPrivilege	2712	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2712	WMIC.exe
Token: SeRemoteShutdownPrivilege	2712	WMIC.exe
Token: SeUndockPrivilege	2712	WMIC.exe
Token: SeManageVolumePrivilege	2712	WMIC.exe
Token: 33	2712	WMIC.exe
Token: 34	2712	WMIC.exe
Token: 35	2712	WMIC.exe
Token: SeBackupPrivilege	1616	wbengine.exe
Token: SeRestorePrivilege	1616	wbengine.exe
Token: SeSecurityPrivilege	1616	wbengine.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 2392	2228	PrivateChat.exe	30
PID 2228 wrote to memory of 2392	2228	PrivateChat.exe	30
PID 2228 wrote to memory of 2392	2228	PrivateChat.exe	30
PID 2392 wrote to memory of 2052	2392	PrivateChat.exe	32
PID 2392 wrote to memory of 2052	2392	PrivateChat.exe	32
PID 2392 wrote to memory of 2052	2392	PrivateChat.exe	32
PID 2052 wrote to memory of 1896	2052	cmd.exe	34
PID 2052 wrote to memory of 1896	2052	cmd.exe	34
PID 2052 wrote to memory of 1896	2052	cmd.exe	34
PID 2052 wrote to memory of 2712	2052	cmd.exe	38
PID 2052 wrote to memory of 2712	2052	cmd.exe	38
PID 2052 wrote to memory of 2712	2052	cmd.exe	38
PID 2392 wrote to memory of 2084	2392	PrivateChat.exe	40
PID 2392 wrote to memory of 2084	2392	PrivateChat.exe	40
PID 2392 wrote to memory of 2084	2392	PrivateChat.exe	40
PID 2084 wrote to memory of 848	2084	cmd.exe	42
PID 2084 wrote to memory of 848	2084	cmd.exe	42
PID 2084 wrote to memory of 848	2084	cmd.exe	42
PID 2084 wrote to memory of 2072	2084	cmd.exe	43
PID 2084 wrote to memory of 2072	2084	cmd.exe	43
PID 2084 wrote to memory of 2072	2084	cmd.exe	43
PID 2392 wrote to memory of 2892	2392	PrivateChat.exe	44
PID 2392 wrote to memory of 2892	2392	PrivateChat.exe	44
PID 2392 wrote to memory of 2892	2392	PrivateChat.exe	44
PID 2892 wrote to memory of 2056	2892	cmd.exe	46
PID 2892 wrote to memory of 2056	2892	cmd.exe	46
PID 2892 wrote to memory of 2056	2892	cmd.exe	46
PID 2392 wrote to memory of 1552	2392	PrivateChat.exe	50
PID 2392 wrote to memory of 1552	2392	PrivateChat.exe	50
PID 2392 wrote to memory of 1552	2392	PrivateChat.exe	50

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:2228
- 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:2392
- - 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:2052
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:1896
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:2712
- - 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:2084
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:848
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2072
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2892
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:2056
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:1552

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1824

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1616

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:280

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
PID:892

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
120KB

MD5
5d4c5f3457c4487fe26df768ed8f3d2b

SHA1
f5f3df7d11e06dc158ac8183a8bde5895f8ea251

SHA256
19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32

SHA512
793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a

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

Filesize
366B

MD5
a9739643e50a5d9ca0f162feb7846dd5

SHA1
d10c5feedd35fd2a24cd1266014ae8adaad22fd3

SHA256
e611bd6ae4702f7496dda7ae78a5df097d1e6858c7fa38b3b9b7140379f7d51c

SHA512
cb5e3943ccce39f10a899a4900952b702601840a2e6dd8e385ebed1e4e7b041f8440dd7dde229c5d28cf82f380b17f498a3e6cb8426d984b71a4115de3df9552

Download Submit
memory/2228-0-0x0000000000EE0000-0x0000000000F04000-memory.dmp

Filesize
144KB

Download
memory/2228-1-0x000007FEF64E0000-0x000007FEF6ECC000-memory.dmp

Filesize
9.9MB

Download
memory/2228-8-0x000007FEF64E0000-0x000007FEF6ECC000-memory.dmp

Filesize
9.9MB

Download
memory/2392-7-0x0000000000A70000-0x0000000000A94000-memory.dmp

Filesize
144KB

Download
memory/2392-9-0x000007FEF64E0000-0x000007FEF6ECC000-memory.dmp

Filesize
9.9MB

Download
memory/2392-11-0x000000001AE20000-0x000000001AEA0000-memory.dmp

Filesize
512KB

Download
memory/2392-475-0x000007FEF64E0000-0x000007FEF6ECC000-memory.dmp

Filesize
9.9MB

Download
memory/2392-476-0x000000001AE20000-0x000000001AEA0000-memory.dmp

Filesize
512KB

Download