Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-11-2024 03:05

General

  • Target

    739e1ab9e63ec4da436b2861c3c23111a823676896b6f2f40cf0051bf5c0e951.exe

  • Size

    388KB

  • MD5

    d313cf4e6bf5e9dcb2ed3e722984bc8e

  • SHA1

    21a28a94e0de60603ad1664a843717a8aeba30c9

  • SHA256

    739e1ab9e63ec4da436b2861c3c23111a823676896b6f2f40cf0051bf5c0e951

  • SHA512

    2a0d479f8b299370bb67ce34f4dfb58b52c70e7edcfa1f9cb6c40a6162455b77aad70bfd1f619dda327d969852eb1c20c7768f1c4247450740c203521f37ff34

  • SSDEEP

    6144:fr9Sqdd/nDTCKm1ussOaOYNmJL2gGYBppgnvufOKvNbq7a+0blRIJ6Af:Dd1nDTC11utmSfqppmvufOgY7a+oRd

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 IoCs
  • Chaos family
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops desktop.ini file(s) 34 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 3 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 51 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • 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.

  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Users\Admin\AppData\Local\Temp\739e1ab9e63ec4da436b2861c3c23111a823676896b6f2f40cf0051bf5c0e951.exe
    "C:\Users\Admin\AppData\Local\Temp\739e1ab9e63ec4da436b2861c3c23111a823676896b6f2f40cf0051bf5c0e951.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2196
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.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:4072
      • 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:3368
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:3020
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4444
      • 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:4772
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1792
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3240
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2316
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3436
      • 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:1980
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2600
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4156
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:4656
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4516

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      388KB

      MD5

      d313cf4e6bf5e9dcb2ed3e722984bc8e

      SHA1

      21a28a94e0de60603ad1664a843717a8aeba30c9

      SHA256

      739e1ab9e63ec4da436b2861c3c23111a823676896b6f2f40cf0051bf5c0e951

      SHA512

      2a0d479f8b299370bb67ce34f4dfb58b52c70e7edcfa1f9cb6c40a6162455b77aad70bfd1f619dda327d969852eb1c20c7768f1c4247450740c203521f37ff34

    • C:\Users\Admin\Desktop\read_it.txt

      Filesize

      722B

      MD5

      d55bb9ee91282049366a8f31d80f7308

      SHA1

      e2247b1b850d8ab895a66fbb11e2312277d560ce

      SHA256

      01c250d8b2c7dedc5982edd61187ca77654415de0c28dea7605c1875a1a425c2

      SHA512

      74dc8586975345f4e5fa1f20ac3ed772f35dd7ac077ab9682ec61acd38ecc5d69668c7c66b52aeccf15821434d640e7efa012ff8355b0db4b3d68ac99a8eb878

    • memory/2196-0-0x00007FFA21443000-0x00007FFA21445000-memory.dmp

      Filesize

      8KB

    • memory/2196-1-0x0000000000960000-0x00000000009C6000-memory.dmp

      Filesize

      408KB

    • memory/4072-14-0x00007FFA21440000-0x00007FFA21F01000-memory.dmp

      Filesize

      10.8MB

    • memory/4072-69-0x00007FFA21440000-0x00007FFA21F01000-memory.dmp

      Filesize

      10.8MB