chaos | 3bac13b433b453c3db0f70f4e3ce07a2c1108a0892bac358a1d1b38a30e1cd08

Analysis

max time kernel
55s
max time network
54s
platform
windows10-2004_x64
resource
win10v2004-20240419-en
resource tags

arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
submitted
30-04-2024 10:10

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General

Target

rincrypt.exe
Size

165KB
MD5

9f99b9ecdb90b991aa0eb5884523185f
SHA1

5d99a9343765bb758f8ee85585dd376ec190c6e4
SHA256

3bac13b433b453c3db0f70f4e3ce07a2c1108a0892bac358a1d1b38a30e1cd08
SHA512

5c7a8f872bd0c5800e60e164eb605650eac06a6fc07322ab78274cd9c024e08c7cb8797580ecfb9067efd0ab6a1117e5c23fd78b4e6256ccecea4997f0859ed5
SSDEEP

3072:36oLuur9P2Wr6QhzaNpatUPp0hmHzs/0ui8N/Wm9BsB85:dr9P2Wrb2R0Ya/28

Score

10^/10

chaos evasion 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/4808-0-0x00000000002A0000-0x00000000002CE000-memory.dmp	family_chaos
behavioral2/files/0x000b000000023b7e-6.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
4268	bcdedit.exe
780	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
3156	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-1-5-21-3726321484-1950364574-433157660-1000\Control Panel\International\Geo\Nation	rincrypt.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3726321484-1950364574-433157660-1000\Control Panel\International\Geo\Nation	notepad.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	notepad.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\READ THIS.txt	notepad.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\notepad.url	notepad.exe

Executes dropped EXE 1 IoCs

pid	Process
428	notepad.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\Searches\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini	notepad.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\OneDrive\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini	notepad.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	notepad.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	notepad.exe
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-3726321484-1950364574-433157660-1000\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini	notepad.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini	notepad.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Pictures\Camera Roll\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\Pictures\Saved Pictures\desktop.ini	notepad.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	notepad.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-1-5-21-3726321484-1950364574-433157660-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\i653t12fl.jpg"	notepad.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_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
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 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
456	vssadmin.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3726321484-1950364574-433157660-1000_Classes\Local Settings	notepad.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
428	notepad.exe

Suspicious behavior: EnumeratesProcesses 47 IoCs

pid	Process
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
4808	rincrypt.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe
428	notepad.exe

Suspicious use of AdjustPrivilegeToken 50 IoCs

description	pid	Process
Token: SeDebugPrivilege	4808	rincrypt.exe
Token: SeDebugPrivilege	428	notepad.exe
Token: SeBackupPrivilege	556	vssvc.exe
Token: SeRestorePrivilege	556	vssvc.exe
Token: SeAuditPrivilege	556	vssvc.exe
Token: SeIncreaseQuotaPrivilege	2440	WMIC.exe
Token: SeSecurityPrivilege	2440	WMIC.exe
Token: SeTakeOwnershipPrivilege	2440	WMIC.exe
Token: SeLoadDriverPrivilege	2440	WMIC.exe
Token: SeSystemProfilePrivilege	2440	WMIC.exe
Token: SeSystemtimePrivilege	2440	WMIC.exe
Token: SeProfSingleProcessPrivilege	2440	WMIC.exe
Token: SeIncBasePriorityPrivilege	2440	WMIC.exe
Token: SeCreatePagefilePrivilege	2440	WMIC.exe
Token: SeBackupPrivilege	2440	WMIC.exe
Token: SeRestorePrivilege	2440	WMIC.exe
Token: SeShutdownPrivilege	2440	WMIC.exe
Token: SeDebugPrivilege	2440	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2440	WMIC.exe
Token: SeRemoteShutdownPrivilege	2440	WMIC.exe
Token: SeUndockPrivilege	2440	WMIC.exe
Token: SeManageVolumePrivilege	2440	WMIC.exe
Token: 33	2440	WMIC.exe
Token: 34	2440	WMIC.exe
Token: 35	2440	WMIC.exe
Token: 36	2440	WMIC.exe
Token: SeIncreaseQuotaPrivilege	2440	WMIC.exe
Token: SeSecurityPrivilege	2440	WMIC.exe
Token: SeTakeOwnershipPrivilege	2440	WMIC.exe
Token: SeLoadDriverPrivilege	2440	WMIC.exe
Token: SeSystemProfilePrivilege	2440	WMIC.exe
Token: SeSystemtimePrivilege	2440	WMIC.exe
Token: SeProfSingleProcessPrivilege	2440	WMIC.exe
Token: SeIncBasePriorityPrivilege	2440	WMIC.exe
Token: SeCreatePagefilePrivilege	2440	WMIC.exe
Token: SeBackupPrivilege	2440	WMIC.exe
Token: SeRestorePrivilege	2440	WMIC.exe
Token: SeShutdownPrivilege	2440	WMIC.exe
Token: SeDebugPrivilege	2440	WMIC.exe
Token: SeSystemEnvironmentPrivilege	2440	WMIC.exe
Token: SeRemoteShutdownPrivilege	2440	WMIC.exe
Token: SeUndockPrivilege	2440	WMIC.exe
Token: SeManageVolumePrivilege	2440	WMIC.exe
Token: 33	2440	WMIC.exe
Token: 34	2440	WMIC.exe
Token: 35	2440	WMIC.exe
Token: 36	2440	WMIC.exe
Token: SeBackupPrivilege	1208	wbengine.exe
Token: SeRestorePrivilege	1208	wbengine.exe
Token: SeSecurityPrivilege	1208	wbengine.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 428	4808	rincrypt.exe	86
PID 4808 wrote to memory of 428	4808	rincrypt.exe	86
PID 428 wrote to memory of 2664	428	notepad.exe	88
PID 428 wrote to memory of 2664	428	notepad.exe	88
PID 2664 wrote to memory of 456	2664	cmd.exe	90
PID 2664 wrote to memory of 456	2664	cmd.exe	90
PID 2664 wrote to memory of 2440	2664	cmd.exe	93
PID 2664 wrote to memory of 2440	2664	cmd.exe	93
PID 428 wrote to memory of 4196	428	notepad.exe	95
PID 428 wrote to memory of 4196	428	notepad.exe	95
PID 4196 wrote to memory of 4268	4196	cmd.exe	97
PID 4196 wrote to memory of 4268	4196	cmd.exe	97
PID 4196 wrote to memory of 780	4196	cmd.exe	98
PID 4196 wrote to memory of 780	4196	cmd.exe	98
PID 428 wrote to memory of 3580	428	notepad.exe	99
PID 428 wrote to memory of 3580	428	notepad.exe	99
PID 3580 wrote to memory of 3156	3580	cmd.exe	101
PID 3580 wrote to memory of 3156	3580	cmd.exe	101
PID 428 wrote to memory of 4112	428	notepad.exe	105
PID 428 wrote to memory of 4112	428	notepad.exe	105

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\rincrypt.exe
"C:\Users\Admin\AppData\Local\Temp\rincrypt.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4808
- C:\Users\Admin\AppData\Roaming\notepad.exe
  "C:\Users\Admin\AppData\Roaming\notepad.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:428
- - 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:2664
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:456
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:2440
- - 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:4196
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:4268
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:780
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3580
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:3156
- - C:\Windows\system32\NOTEPAD.EXE
    "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\READ THIS.txt
    3⤵
    PID:4112

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:556

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1208

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2136

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
- Checks SCSI registry key(s)
PID:2504

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

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\notepad.exe

Filesize
165KB

MD5
9f99b9ecdb90b991aa0eb5884523185f

SHA1
5d99a9343765bb758f8ee85585dd376ec190c6e4

SHA256
3bac13b433b453c3db0f70f4e3ce07a2c1108a0892bac358a1d1b38a30e1cd08

SHA512
5c7a8f872bd0c5800e60e164eb605650eac06a6fc07322ab78274cd9c024e08c7cb8797580ecfb9067efd0ab6a1117e5c23fd78b4e6256ccecea4997f0859ed5

Download Submit
C:\Users\Admin\Documents\READ THIS.txt

Filesize
116B

MD5
8997745ddb6aa0ec242fedebb654f82f

SHA1
9c3b22208cede1c038ae8a05f021d2c2d7060b5a

SHA256
379e87e41323764decd229c8838aff8f17b334afe0c126737ad343e31fd9c94b

SHA512
597c97b8afe2f37437b57a2f21206625ecf8bf1abf31f776e45ef4503c06152ef89d5855c160296f564abcb801161a9e35e4c4deb903b4cef794e187d8f7f506

Download Submit
memory/428-14-0x00007FFD0ACC0000-0x00007FFD0B781000-memory.dmp

Filesize
10.8MB

Download
memory/428-17-0x00000000026E0000-0x00000000026F0000-memory.dmp

Filesize
64KB

Download
memory/428-449-0x00007FFD0ACC0000-0x00007FFD0B781000-memory.dmp

Filesize
10.8MB

Download
memory/428-450-0x00000000026E0000-0x00000000026F0000-memory.dmp

Filesize
64KB

Download
memory/4808-0-0x00000000002A0000-0x00000000002CE000-memory.dmp

Filesize
184KB

Download
memory/4808-1-0x00007FFD0ACC0000-0x00007FFD0B781000-memory.dmp

Filesize
10.8MB

Download
memory/4808-15-0x00007FFD0ACC0000-0x00007FFD0B781000-memory.dmp

Filesize
10.8MB

Download