chaos | c127022b5b4f3b93311a1f13c660324da03e0dfa698c4c0a9656cd2863c28160

Analysis

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

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
01/06/2024, 14:10

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General

Target

kache.exe
Size

506KB
MD5

03b0db0d3c3ce0f7c19e88219b296922
SHA1

c950bd85b8d302307654fdc848329b4a58cf3949
SHA256

c127022b5b4f3b93311a1f13c660324da03e0dfa698c4c0a9656cd2863c28160
SHA512

d99c946e98c82c9cc4191959b3c016af1885fac9275156499f442b162613c538f0f9f4d3776ad1e040bfd33cbe1d216808356ec1528f1b19eb6c10ded4d47cb6
SSDEEP

12288:HX4GQOqb2ciwew/IFR9AILH0PhDieMlMK2j9mI4ygA2Vv95uekHKe:RsZJK2f6U

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/1924-1-0x00000000001A0000-0x0000000000224000-memory.dmp	family_chaos
behavioral1/files/0x000b000000015bb9-5.dat	family_chaos
behavioral1/memory/2332-7-0x0000000000D30000-0x0000000000DB4000-memory.dmp	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
2036	bcdedit.exe
2796	bcdedit.exe

Renames multiple (198) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

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
1672	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_ME.txt	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2332	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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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\Favorites\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Desktop\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\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\Start Menu\Programs\Accessories\Accessibility\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\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Documents\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\Windows\Start Menu\Programs\Maintenance\Desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\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\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\SendTo\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	F:\$RECYCLE.BIN\S-1-5-21-2297530677-1229052932-2803917579-1000\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\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\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\Favorites\Links for United States\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

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2297530677-1229052932-2803917579-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\b6925ciqa.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 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
2660	vssadmin.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
1904	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2332	svchost.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1924	kache.exe
1924	kache.exe
2332	svchost.exe
2332	svchost.exe
2332	svchost.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeDebugPrivilege	1924	kache.exe
Token: SeDebugPrivilege	2332	svchost.exe
Token: SeBackupPrivilege	2732	vssvc.exe
Token: SeRestorePrivilege	2732	vssvc.exe
Token: SeAuditPrivilege	2732	vssvc.exe
Token: SeIncreaseQuotaPrivilege	1236	WMIC.exe
Token: SeSecurityPrivilege	1236	WMIC.exe
Token: SeTakeOwnershipPrivilege	1236	WMIC.exe
Token: SeLoadDriverPrivilege	1236	WMIC.exe
Token: SeSystemProfilePrivilege	1236	WMIC.exe
Token: SeSystemtimePrivilege	1236	WMIC.exe
Token: SeProfSingleProcessPrivilege	1236	WMIC.exe
Token: SeIncBasePriorityPrivilege	1236	WMIC.exe
Token: SeCreatePagefilePrivilege	1236	WMIC.exe
Token: SeBackupPrivilege	1236	WMIC.exe
Token: SeRestorePrivilege	1236	WMIC.exe
Token: SeShutdownPrivilege	1236	WMIC.exe
Token: SeDebugPrivilege	1236	WMIC.exe
Token: SeSystemEnvironmentPrivilege	1236	WMIC.exe
Token: SeRemoteShutdownPrivilege	1236	WMIC.exe
Token: SeUndockPrivilege	1236	WMIC.exe
Token: SeManageVolumePrivilege	1236	WMIC.exe
Token: 33	1236	WMIC.exe
Token: 34	1236	WMIC.exe
Token: 35	1236	WMIC.exe
Token: SeIncreaseQuotaPrivilege	1236	WMIC.exe
Token: SeSecurityPrivilege	1236	WMIC.exe
Token: SeTakeOwnershipPrivilege	1236	WMIC.exe
Token: SeLoadDriverPrivilege	1236	WMIC.exe
Token: SeSystemProfilePrivilege	1236	WMIC.exe
Token: SeSystemtimePrivilege	1236	WMIC.exe
Token: SeProfSingleProcessPrivilege	1236	WMIC.exe
Token: SeIncBasePriorityPrivilege	1236	WMIC.exe
Token: SeCreatePagefilePrivilege	1236	WMIC.exe
Token: SeBackupPrivilege	1236	WMIC.exe
Token: SeRestorePrivilege	1236	WMIC.exe
Token: SeShutdownPrivilege	1236	WMIC.exe
Token: SeDebugPrivilege	1236	WMIC.exe
Token: SeSystemEnvironmentPrivilege	1236	WMIC.exe
Token: SeRemoteShutdownPrivilege	1236	WMIC.exe
Token: SeUndockPrivilege	1236	WMIC.exe
Token: SeManageVolumePrivilege	1236	WMIC.exe
Token: 33	1236	WMIC.exe
Token: 34	1236	WMIC.exe
Token: 35	1236	WMIC.exe
Token: SeBackupPrivilege	2940	wbengine.exe
Token: SeRestorePrivilege	2940	wbengine.exe
Token: SeSecurityPrivilege	2940	wbengine.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 2332	1924	kache.exe	28
PID 1924 wrote to memory of 2332	1924	kache.exe	28
PID 1924 wrote to memory of 2332	1924	kache.exe	28
PID 2332 wrote to memory of 2668	2332	svchost.exe	30
PID 2332 wrote to memory of 2668	2332	svchost.exe	30
PID 2332 wrote to memory of 2668	2332	svchost.exe	30
PID 2668 wrote to memory of 2660	2668	cmd.exe	32
PID 2668 wrote to memory of 2660	2668	cmd.exe	32
PID 2668 wrote to memory of 2660	2668	cmd.exe	32
PID 2668 wrote to memory of 1236	2668	cmd.exe	35
PID 2668 wrote to memory of 1236	2668	cmd.exe	35
PID 2668 wrote to memory of 1236	2668	cmd.exe	35
PID 2332 wrote to memory of 1016	2332	svchost.exe	37
PID 2332 wrote to memory of 1016	2332	svchost.exe	37
PID 2332 wrote to memory of 1016	2332	svchost.exe	37
PID 1016 wrote to memory of 2036	1016	cmd.exe	39
PID 1016 wrote to memory of 2036	1016	cmd.exe	39
PID 1016 wrote to memory of 2036	1016	cmd.exe	39
PID 1016 wrote to memory of 2796	1016	cmd.exe	40
PID 1016 wrote to memory of 2796	1016	cmd.exe	40
PID 1016 wrote to memory of 2796	1016	cmd.exe	40
PID 2332 wrote to memory of 1108	2332	svchost.exe	41
PID 2332 wrote to memory of 1108	2332	svchost.exe	41
PID 2332 wrote to memory of 1108	2332	svchost.exe	41
PID 1108 wrote to memory of 1672	1108	cmd.exe	43
PID 1108 wrote to memory of 1672	1108	cmd.exe	43
PID 1108 wrote to memory of 1672	1108	cmd.exe	43
PID 2332 wrote to memory of 1904	2332	svchost.exe	47
PID 2332 wrote to memory of 1904	2332	svchost.exe	47
PID 2332 wrote to memory of 1904	2332	svchost.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\kache.exe
"C:\Users\Admin\AppData\Local\Temp\kache.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1924
- 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:2332
- - 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:2668
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:2660
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:1236
- - 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:1016
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2036
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2796
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1108
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:1672
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\READ_ME.txt
    3⤵
    - Opens file in notepad (likely ransom note)
    PID:1904

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2732

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2940

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2216

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
PID:1732

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

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\svchost.exe

Filesize
506KB

MD5
03b0db0d3c3ce0f7c19e88219b296922

SHA1
c950bd85b8d302307654fdc848329b4a58cf3949

SHA256
c127022b5b4f3b93311a1f13c660324da03e0dfa698c4c0a9656cd2863c28160

SHA512
d99c946e98c82c9cc4191959b3c016af1885fac9275156499f442b162613c538f0f9f4d3776ad1e040bfd33cbe1d216808356ec1528f1b19eb6c10ded4d47cb6

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

Filesize
67B

MD5
a72ae082b265f256a2a53a8652a356f3

SHA1
6036049c9bd13bf8a68d92682edd8b0dfa5ea62e

SHA256
b0303a6a7a6ae276d3aaa16480b14e2cd549e382c21fb80506782186010ef0eb

SHA512
ac464dd9e7cd5298e2278d592965a863c4489f0a5b45a63929d2b179cd5a7ef9b9b194a3771e0b731cc52154276535008ee03469f31ec144249aebef4ce552c2

Download Submit
memory/1924-0-0x000007FEF5E63000-0x000007FEF5E64000-memory.dmp

Filesize
4KB

Download
memory/1924-1-0x00000000001A0000-0x0000000000224000-memory.dmp

Filesize
528KB

Download
memory/2332-7-0x0000000000D30000-0x0000000000DB4000-memory.dmp

Filesize
528KB

Download
memory/2332-9-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-16-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download
memory/2332-459-0x000007FEF5E60000-0x000007FEF684C000-memory.dmp

Filesize
9.9MB

Download