chaos | e566ee2189f830504af1cb787279111b7b2f3817a61a85bad8d9810701dd4877

Analysis

max time kernel
1559s
max time network
1560s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
16-07-2024 08:54

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
Size

88KB
MD5

85e06406f5dfd6d96d6185a781b29f75
SHA1

7b331b808505affee442042f81214360eddf53fc
SHA256

434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27
SHA512

d6a3464437f0bab899eea250f638b95aaea298e4be8cd8fcddc9fd5b7c2888f51c5e99a9df8ff1eeb8b8e66f810eef2a1338610b893502a58672b917a980cd38
SSDEEP

768:Cqo2J0wpBxARr9WVFe32SU2Ip4jBqltCF0AxEjenoB69+Fx:5o2icARr9WK32SFHBWAxEjc+

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

Processes:

resource	yara_rule
behavioral13/memory/2396-1-0x00000000000B0000-0x00000000000CC000-memory.dmp	family_chaos
C:\Users\Admin\AppData\Roaming\PDF_Reader.exe	family_chaos
behavioral13/memory/2744-7-0x00000000011B0000-0x00000000011CC000-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

Processes:

bcdedit.exebcdedit.exe

pid process

916 bcdedit.exe
2140 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

Processes:

wbadmin.exe

pid process

1252 wbadmin.exe

pid	process
916	bcdedit.exe
2140	bcdedit.exe

pid	process
1252	wbadmin.exe

Drops startup file 3 IoCs

Processes:

PDF_Reader.exe

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

Executes dropped EXE 1 IoCs

Processes:

PDF_Reader.exe

pid process

2744 PDF_Reader.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

pid	process
2744	PDF_Reader.exe

Drops desktop.ini file(s) 34 IoCs

Processes:

PDF_Reader.exe

description	ioc	process
File opened for modification	F:\$RECYCLE.BIN\S-1-5-21-3434294380-2554721341-1919518612-1000\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Music\Sample Music\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Favorites\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Favorites\Links\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Videos\Sample Videos\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Desktop\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Music\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Saved Games\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Music\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Documents\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Pictures\Sample Pictures\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Favorites\Links for United States\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Documents\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Pictures\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Contacts\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Searches\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Desktop\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Public\Videos\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Downloads\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Pictures\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Links\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\Videos\desktop.ini	PDF_Reader.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini	PDF_Reader.exe

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

System Information Discovery
T1082
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
ransomware

File Deletion
T1070.004

Inhibit System Recovery
T1490

Direct Volume Access
T1006

Processes:

vssadmin.exe

pid process

2308 vssadmin.exe
Opens file in notepad (likely ransom note) 1 IoCs
ransomware

Processes:

NOTEPAD.EXE

pid process

756 NOTEPAD.EXE
Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

PDF_Reader.exe

pid process

2744 PDF_Reader.exe

pid	process
2308	vssadmin.exe

pid	process
756	NOTEPAD.EXE

pid	process
2744	PDF_Reader.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

Processes:

434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exePDF_Reader.exe

pid	process
2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
2744	PDF_Reader.exe
2744	PDF_Reader.exe
2744	PDF_Reader.exe
2744	PDF_Reader.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

Processes:

434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exePDF_Reader.exevssvc.exeWMIC.exewbengine.exe

description	pid	process
Token: SeDebugPrivilege	2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
Token: SeDebugPrivilege	2744	PDF_Reader.exe
Token: SeBackupPrivilege	540	vssvc.exe
Token: SeRestorePrivilege	540	vssvc.exe
Token: SeAuditPrivilege	540	vssvc.exe
Token: SeIncreaseQuotaPrivilege	548	WMIC.exe
Token: SeSecurityPrivilege	548	WMIC.exe
Token: SeTakeOwnershipPrivilege	548	WMIC.exe
Token: SeLoadDriverPrivilege	548	WMIC.exe
Token: SeSystemProfilePrivilege	548	WMIC.exe
Token: SeSystemtimePrivilege	548	WMIC.exe
Token: SeProfSingleProcessPrivilege	548	WMIC.exe
Token: SeIncBasePriorityPrivilege	548	WMIC.exe
Token: SeCreatePagefilePrivilege	548	WMIC.exe
Token: SeBackupPrivilege	548	WMIC.exe
Token: SeRestorePrivilege	548	WMIC.exe
Token: SeShutdownPrivilege	548	WMIC.exe
Token: SeDebugPrivilege	548	WMIC.exe
Token: SeSystemEnvironmentPrivilege	548	WMIC.exe
Token: SeRemoteShutdownPrivilege	548	WMIC.exe
Token: SeUndockPrivilege	548	WMIC.exe
Token: SeManageVolumePrivilege	548	WMIC.exe
Token: 33	548	WMIC.exe
Token: 34	548	WMIC.exe
Token: 35	548	WMIC.exe
Token: SeIncreaseQuotaPrivilege	548	WMIC.exe
Token: SeSecurityPrivilege	548	WMIC.exe
Token: SeTakeOwnershipPrivilege	548	WMIC.exe
Token: SeLoadDriverPrivilege	548	WMIC.exe
Token: SeSystemProfilePrivilege	548	WMIC.exe
Token: SeSystemtimePrivilege	548	WMIC.exe
Token: SeProfSingleProcessPrivilege	548	WMIC.exe
Token: SeIncBasePriorityPrivilege	548	WMIC.exe
Token: SeCreatePagefilePrivilege	548	WMIC.exe
Token: SeBackupPrivilege	548	WMIC.exe
Token: SeRestorePrivilege	548	WMIC.exe
Token: SeShutdownPrivilege	548	WMIC.exe
Token: SeDebugPrivilege	548	WMIC.exe
Token: SeSystemEnvironmentPrivilege	548	WMIC.exe
Token: SeRemoteShutdownPrivilege	548	WMIC.exe
Token: SeUndockPrivilege	548	WMIC.exe
Token: SeManageVolumePrivilege	548	WMIC.exe
Token: 33	548	WMIC.exe
Token: 34	548	WMIC.exe
Token: 35	548	WMIC.exe
Token: SeBackupPrivilege	764	wbengine.exe
Token: SeRestorePrivilege	764	wbengine.exe
Token: SeSecurityPrivilege	764	wbengine.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exePDF_Reader.execmd.execmd.execmd.exe

description	pid	process	target process
PID 2396 wrote to memory of 2744	2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe	PDF_Reader.exe
PID 2396 wrote to memory of 2744	2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe	PDF_Reader.exe
PID 2396 wrote to memory of 2744	2396	434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe	PDF_Reader.exe
PID 2744 wrote to memory of 1068	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 1068	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 1068	2744	PDF_Reader.exe	cmd.exe
PID 1068 wrote to memory of 2308	1068	cmd.exe	vssadmin.exe
PID 1068 wrote to memory of 2308	1068	cmd.exe	vssadmin.exe
PID 1068 wrote to memory of 2308	1068	cmd.exe	vssadmin.exe
PID 1068 wrote to memory of 548	1068	cmd.exe	WMIC.exe
PID 1068 wrote to memory of 548	1068	cmd.exe	WMIC.exe
PID 1068 wrote to memory of 548	1068	cmd.exe	WMIC.exe
PID 2744 wrote to memory of 2924	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 2924	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 2924	2744	PDF_Reader.exe	cmd.exe
PID 2924 wrote to memory of 916	2924	cmd.exe	bcdedit.exe
PID 2924 wrote to memory of 916	2924	cmd.exe	bcdedit.exe
PID 2924 wrote to memory of 916	2924	cmd.exe	bcdedit.exe
PID 2924 wrote to memory of 2140	2924	cmd.exe	bcdedit.exe
PID 2924 wrote to memory of 2140	2924	cmd.exe	bcdedit.exe
PID 2924 wrote to memory of 2140	2924	cmd.exe	bcdedit.exe
PID 2744 wrote to memory of 1148	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 1148	2744	PDF_Reader.exe	cmd.exe
PID 2744 wrote to memory of 1148	2744	PDF_Reader.exe	cmd.exe
PID 1148 wrote to memory of 1252	1148	cmd.exe	wbadmin.exe
PID 1148 wrote to memory of 1252	1148	cmd.exe	wbadmin.exe
PID 1148 wrote to memory of 1252	1148	cmd.exe	wbadmin.exe
PID 2744 wrote to memory of 756	2744	PDF_Reader.exe	NOTEPAD.EXE
PID 2744 wrote to memory of 756	2744	PDF_Reader.exe	NOTEPAD.EXE
PID 2744 wrote to memory of 756	2744	PDF_Reader.exe	NOTEPAD.EXE

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\434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe
"C:\Users\Admin\AppData\Local\Temp\434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2396
- C:\Users\Admin\AppData\Roaming\PDF_Reader.exe
  "C:\Users\Admin\AppData\Roaming\PDF_Reader.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Drops desktop.ini file(s)
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2744
- - 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:1068
  - - C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      4⤵
      Interacts with shadow copies
      PID:2308
  - - C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:548
- - 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:2924
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} bootstatuspolicy ignoreallfailures
      4⤵
      Modifies boot configuration data using bcdedit
      PID:916
  - - C:\Windows\system32\bcdedit.exe
      bcdedit /set {default} recoveryenabled no
      4⤵
      Modifies boot configuration data using bcdedit
      PID:2140
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1148
  - - C:\Windows\system32\wbadmin.exe
      wbadmin delete catalog -quiet
      4⤵
      Deletes backup catalog
      PID:1252
- - 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:756

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:540

C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:764

C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
1⤵
PID:2016

C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
1⤵
PID:1352

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

Direct Volume Access

T1006

Indicator Removal

T1070

File Deletion

T1070.004

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

Inhibit System Recovery

T1490

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
88KB

MD5
85e06406f5dfd6d96d6185a781b29f75

SHA1
7b331b808505affee442042f81214360eddf53fc

SHA256
434ea9832e6d11d614905e3eb31c333289429095b76573f1ceb38fd10608bc27

SHA512
d6a3464437f0bab899eea250f638b95aaea298e4be8cd8fcddc9fd5b7c2888f51c5e99a9df8ff1eeb8b8e66f810eef2a1338610b893502a58672b917a980cd38

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

Filesize
381B

MD5
c98ceb94407ce0ebeb4a29390ff2c893

SHA1
785ec5b4aa9a3e54ada438b73744f70656363d61

SHA256
e1890dab648991ae8e47b4dfdaf43d2cbbc8c2f686e91bbc740a3b66d2c05e0e

SHA512
d7e65abed36f68e7d6911c4913b17cb2813623dc14ddcc71bfa2e84b626ac2e2768f4b40dcba1aee317b3fb753d442009176eec29421e9c5f5cc52dd68e2156f

Download Submit
memory/2396-0-0x000007FEF5B43000-0x000007FEF5B44000-memory.dmp

Filesize
4KB

Download
memory/2396-1-0x00000000000B0000-0x00000000000CC000-memory.dmp

Filesize
112KB

Download
memory/2744-7-0x00000000011B0000-0x00000000011CC000-memory.dmp

Filesize
112KB

Download
memory/2744-19-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/2744-22-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download
memory/2744-466-0x000007FEF5B40000-0x000007FEF652C000-memory.dmp

Filesize
9.9MB

Download