chaos | 71bfe1f26a98e152344fe5687db229da90e9ba8475cb3804a78a0f46152ba0bf

Analysis

max time kernel
147s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
29-04-2024 08:20

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General

Target

pack/cho2.exe
Size

22KB
MD5

29fa75458106f03a11560ca466363129
SHA1

89db6502c8170f260b48d80ee0ece3380ba77eb5
SHA256

3f5ade39f3658b6da93987f7ba7dba38d7d94096638ef9f3565790e6ab73eef7
SHA512

28a58b096f560ac4cd03b96f77f7e0cbe7e96c4fb56fb6758c3e4ff7304e3ae4e0db35570f69070c676e45143dedb7be50556bc80f38364400ea2d43bec99188
SSDEEP

384:j3Mg/bqo2uOv0tpDnqp+Ao4+X0Z/dJZr91C8OWh0et:Vqo2BDp+J4+kRrZr9hLyet

Score

10^/10

chaos evasion ransomware spyware stealer

Malware Config

Extracted

Path

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

Ransom Note

!!! ATTENTION !!! Your device has been locked by our ransomware. To regain access to your device and your files, you must pay a ransom of : $100 USD in Bitcoin. Bitcoin Address: bc1qgk07vhn53ws7khy3840gjjvlw7qgzftfjgweq2 Once payment is made, please send an email to [email protected] with the transaction ID as proof of payment. Upon confirmation of your payment, you will receive instructions on how to unlock your device. !!! ATTENTION !!!

Emails

[email protected]

Signatures

Chaos
Ransomware family first seen in June 2021.
ransomware chaos

Chaos Ransomware 2 IoCs

resource	yara_rule
behavioral3/memory/3624-0-0x0000000000240000-0x000000000024C000-memory.dmp	family_chaos
behavioral3/files/0x001c00000002aae4-7.dat	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
2800	bcdedit.exe
2648	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
3804	wbadmin.exe

Drops startup file 3 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
3948	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\Saved Games\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\Start Menu\Programs\Accessories\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\Videos\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\Maintenance\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\Videos\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\Favorites\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	svchost.exe
File opened for modification	C:\Users\Admin\Downloads\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	F:\$RECYCLE.BIN\S-1-5-21-1474490143-3221292397-4168103503-1000\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\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\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\OneDrive\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\Admin\Links\desktop.ini	svchost.exe
File opened for modification	C:\Users\Public\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\Admin\Music\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\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\Documents\desktop.ini	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 value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName	vds.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_DADY&PROD_HARDDISK\4&215468A5&0&000000	vds.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\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

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
3568	vssadmin.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1474490143-3221292397-4168103503-1000_Classes\Local Settings	svchost.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
2052	NOTEPAD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3948	svchost.exe

Suspicious behavior: EnumeratesProcesses 37 IoCs

pid	Process
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3624	cho2.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe
3948	svchost.exe

Suspicious use of AdjustPrivilegeToken 50 IoCs

description	pid	Process
Token: SeDebugPrivilege	3624	cho2.exe
Token: SeDebugPrivilege	3948	svchost.exe
Token: SeBackupPrivilege	2760	vssvc.exe
Token: SeRestorePrivilege	2760	vssvc.exe
Token: SeAuditPrivilege	2760	vssvc.exe
Token: SeIncreaseQuotaPrivilege	5040	WMIC.exe
Token: SeSecurityPrivilege	5040	WMIC.exe
Token: SeTakeOwnershipPrivilege	5040	WMIC.exe
Token: SeLoadDriverPrivilege	5040	WMIC.exe
Token: SeSystemProfilePrivilege	5040	WMIC.exe
Token: SeSystemtimePrivilege	5040	WMIC.exe
Token: SeProfSingleProcessPrivilege	5040	WMIC.exe
Token: SeIncBasePriorityPrivilege	5040	WMIC.exe
Token: SeCreatePagefilePrivilege	5040	WMIC.exe
Token: SeBackupPrivilege	5040	WMIC.exe
Token: SeRestorePrivilege	5040	WMIC.exe
Token: SeShutdownPrivilege	5040	WMIC.exe
Token: SeDebugPrivilege	5040	WMIC.exe
Token: SeSystemEnvironmentPrivilege	5040	WMIC.exe
Token: SeRemoteShutdownPrivilege	5040	WMIC.exe
Token: SeUndockPrivilege	5040	WMIC.exe
Token: SeManageVolumePrivilege	5040	WMIC.exe
Token: 33	5040	WMIC.exe
Token: 34	5040	WMIC.exe
Token: 35	5040	WMIC.exe
Token: 36	5040	WMIC.exe
Token: SeIncreaseQuotaPrivilege	5040	WMIC.exe
Token: SeSecurityPrivilege	5040	WMIC.exe
Token: SeTakeOwnershipPrivilege	5040	WMIC.exe
Token: SeLoadDriverPrivilege	5040	WMIC.exe
Token: SeSystemProfilePrivilege	5040	WMIC.exe
Token: SeSystemtimePrivilege	5040	WMIC.exe
Token: SeProfSingleProcessPrivilege	5040	WMIC.exe
Token: SeIncBasePriorityPrivilege	5040	WMIC.exe
Token: SeCreatePagefilePrivilege	5040	WMIC.exe
Token: SeBackupPrivilege	5040	WMIC.exe
Token: SeRestorePrivilege	5040	WMIC.exe
Token: SeShutdownPrivilege	5040	WMIC.exe
Token: SeDebugPrivilege	5040	WMIC.exe
Token: SeSystemEnvironmentPrivilege	5040	WMIC.exe
Token: SeRemoteShutdownPrivilege	5040	WMIC.exe
Token: SeUndockPrivilege	5040	WMIC.exe
Token: SeManageVolumePrivilege	5040	WMIC.exe
Token: 33	5040	WMIC.exe
Token: 34	5040	WMIC.exe
Token: 35	5040	WMIC.exe
Token: 36	5040	WMIC.exe
Token: SeBackupPrivilege	3008	wbengine.exe
Token: SeRestorePrivilege	3008	wbengine.exe
Token: SeSecurityPrivilege	3008	wbengine.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 3624 wrote to memory of 3948	3624	cho2.exe	80
PID 3624 wrote to memory of 3948	3624	cho2.exe	80
PID 3948 wrote to memory of 3576	3948	svchost.exe	82
PID 3948 wrote to memory of 3576	3948	svchost.exe	82
PID 3576 wrote to memory of 3568	3576	cmd.exe	84
PID 3576 wrote to memory of 3568	3576	cmd.exe	84
PID 3576 wrote to memory of 5040	3576	cmd.exe	87
PID 3576 wrote to memory of 5040	3576	cmd.exe	87
PID 3948 wrote to memory of 3396	3948	svchost.exe	89
PID 3948 wrote to memory of 3396	3948	svchost.exe	89
PID 3396 wrote to memory of 2800	3396	cmd.exe	91
PID 3396 wrote to memory of 2800	3396	cmd.exe	91
PID 3396 wrote to memory of 2648	3396	cmd.exe	92
PID 3396 wrote to memory of 2648	3396	cmd.exe	92
PID 3948 wrote to memory of 1108	3948	svchost.exe	93
PID 3948 wrote to memory of 1108	3948	svchost.exe	93
PID 1108 wrote to memory of 3804	1108	cmd.exe	95
PID 1108 wrote to memory of 3804	1108	cmd.exe	95
PID 3948 wrote to memory of 2052	3948	svchost.exe	99
PID 3948 wrote to memory of 2052	3948	svchost.exe	99

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\pack\cho2.exe
"C:\Users\Admin\AppData\Local\Temp\pack\cho2.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3624
- 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)
  - Modifies registry class
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3948
- - 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:3576
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:3568
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:5040
- - 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:3396
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2800
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2648
- - 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:3804
- - 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:2052

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2760

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3008

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:3876

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
- Checks SCSI registry key(s)
PID:4200

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

Credential Access

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

Inhibit System Recovery

T1490

Replay Monitor

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Downloads

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

Filesize
22KB

MD5
29fa75458106f03a11560ca466363129

SHA1
89db6502c8170f260b48d80ee0ece3380ba77eb5

SHA256
3f5ade39f3658b6da93987f7ba7dba38d7d94096638ef9f3565790e6ab73eef7

SHA512
28a58b096f560ac4cd03b96f77f7e0cbe7e96c4fb56fb6758c3e4ff7304e3ae4e0db35570f69070c676e45143dedb7be50556bc80f38364400ea2d43bec99188

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

Filesize
462B

MD5
9ef56b0438e82e07aa14fb9481d10b18

SHA1
b4d069b4737d9f32d07618d83650f7c1ed3bf6eb

SHA256
ae7ff3ea3c8870144b97cde602f5e84f8a365939cf127fafa38a5309f29b69d3

SHA512
a7f14c7f8b01ef7c21e2350e9b9efdcbb8d533197b63d7bc50d4c75a2190a2fc5633698a532ed07a186333097dd08991852721051d255d1bf2cfc9356cdf523d

Download Submit
memory/3624-0-0x0000000000240000-0x000000000024C000-memory.dmp

Filesize
48KB

Download
memory/3624-1-0x00007FFE572F0000-0x00007FFE57DB2000-memory.dmp

Filesize
10.8MB

Download
memory/3624-2-0x00007FFE572F0000-0x00007FFE57DB2000-memory.dmp

Filesize
10.8MB

Download
memory/3624-15-0x00007FFE572F0000-0x00007FFE57DB2000-memory.dmp

Filesize
10.8MB

Download
memory/3948-16-0x00007FFE572F0000-0x00007FFE57DB2000-memory.dmp

Filesize
10.8MB

Download
memory/3948-443-0x00007FFE572F0000-0x00007FFE57DB2000-memory.dmp

Filesize
10.8MB

Download