Analysis

  • max time kernel
    62s
  • max time network
    51s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-04-2024 13:42

General

  • Target

    2024-04-29_af51c1a91ec1249730d7b22979cc7c42_chaos_destroyer_wannacry.exe

  • Size

    22KB

  • MD5

    af51c1a91ec1249730d7b22979cc7c42

  • SHA1

    5285d86451c719a0b0c0eb833ac227772488436d

  • SHA256

    4710fb0bd1a6beb6f5b9cbb88a3141fbaffc54341f146570a7aac42df2938588

  • SHA512

    b2fcd6dcefb8b672b5c9d27fcd08f0858fc46e58b2f73511d4aaa2fea63d68fb3ac0b5e8a0ea6375227fc5a26a8dfc48b116225397aea6b7b9165a348c3a55e0

  • SSDEEP

    384:U3Mg/bqo2pOv0tpDnqp+Ao4+X0Z/zJHr91C8OWhneK:qqo2EDp+J4+kRVHr9hLJeK

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 !!!

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Detects command variations typically used by ransomware 2 IoCs
  • 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 2 TTPs

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

  • Drops desktop.ini file(s) 34 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 2 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\2024-04-29_af51c1a91ec1249730d7b22979cc7c42_chaos_destroyer_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-29_af51c1a91ec1249730d7b22979cc7c42_chaos_destroyer_wannacry.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4280
    • 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)
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1456
      • 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:1476
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:4800
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4328
      • 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:4088
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4652
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3820
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1932
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1224
      • 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:2944
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4916
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1544
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:3172
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:3136

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      22KB

      MD5

      af51c1a91ec1249730d7b22979cc7c42

      SHA1

      5285d86451c719a0b0c0eb833ac227772488436d

      SHA256

      4710fb0bd1a6beb6f5b9cbb88a3141fbaffc54341f146570a7aac42df2938588

      SHA512

      b2fcd6dcefb8b672b5c9d27fcd08f0858fc46e58b2f73511d4aaa2fea63d68fb3ac0b5e8a0ea6375227fc5a26a8dfc48b116225397aea6b7b9165a348c3a55e0

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

      Filesize

      462B

      MD5

      9ef56b0438e82e07aa14fb9481d10b18

      SHA1

      b4d069b4737d9f32d07618d83650f7c1ed3bf6eb

      SHA256

      ae7ff3ea3c8870144b97cde602f5e84f8a365939cf127fafa38a5309f29b69d3

      SHA512

      a7f14c7f8b01ef7c21e2350e9b9efdcbb8d533197b63d7bc50d4c75a2190a2fc5633698a532ed07a186333097dd08991852721051d255d1bf2cfc9356cdf523d

    • memory/1456-15-0x00007FFC09D40000-0x00007FFC0A801000-memory.dmp

      Filesize

      10.8MB

    • memory/1456-478-0x00007FFC09D40000-0x00007FFC0A801000-memory.dmp

      Filesize

      10.8MB

    • memory/4280-0-0x00000000004A0000-0x00000000004AC000-memory.dmp

      Filesize

      48KB

    • memory/4280-1-0x00007FFC09D40000-0x00007FFC0A801000-memory.dmp

      Filesize

      10.8MB

    • memory/4280-14-0x00007FFC09D40000-0x00007FFC0A801000-memory.dmp

      Filesize

      10.8MB