Analysis

  • max time kernel
    1556s
  • max time network
    1558s
  • 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

General

  • Target

    b098486c49a73591ca003f20276f1ca33605618a7167407d9f3f096bc7ec930d.exe

  • Size

    374KB

  • MD5

    730f2f4f1c26912b59156d062af8de6f

  • SHA1

    3d32f7e5e0ef9424c4d309109d3c765d3fb95091

  • SHA256

    b098486c49a73591ca003f20276f1ca33605618a7167407d9f3f096bc7ec930d

  • SHA512

    c2e7f694c1c28724ad98abe8b5493cb4b8270406652d32d0d0c3e20a14dff19e12e815ef9bd0f1fd11aecc9bd4220c6cdaff39233a48338c7dd6d986764692fe

  • SSDEEP

    6144:1bW9jEAJfeSrTr2MC9LDOTPRM1rOEt26k5M6y6Om+4EgYYnLOPrlzpLHDD6:1qE+lrTrC9LDOTPRMpOc26k549v4EnGP

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (291) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 2 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Drops desktop.ini file(s) 64 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).

  • Interacts with shadow copies 3 TTPs 1 IoCs

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

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 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\b098486c49a73591ca003f20276f1ca33605618a7167407d9f3f096bc7ec930d.exe
    "C:\Users\Admin\AppData\Local\Temp\b098486c49a73591ca003f20276f1ca33605618a7167407d9f3f096bc7ec930d.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1736
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:296
      • 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:2980
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:1940
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2620
      • 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:1064
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2244
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2136
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1592
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1976
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Cocatb_xoxJlbl_2 .txt
        3⤵
          PID:2092
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2264
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2300
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:268
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
          PID:1984

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\MSOCache\All Users\{90140000-0011-0000-0000-0000000FF1CE}-C\PidGenX.dll

          Filesize

          1B

          MD5

          d1457b72c3fb323a2671125aef3eab5d

          SHA1

          5bab61eb53176449e25c2c82f172b82cb13ffb9d

          SHA256

          8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

          SHA512

          ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

        • C:\MSOCache\All Users\{90140000-0019-0409-0000-0000000FF1CE}-C\Cocatb_xoxJlbl_2 .txt

          Filesize

          649B

          MD5

          eb2f0e1018bb2af954e36f886c4bb6b5

          SHA1

          b22528ef955f33274476dc19db4feb40fa280654

          SHA256

          d3f52c989b1186ee76fda91eefc637ee3f073fbe44cafbffe6e1ed59ea97a000

          SHA512

          82683828e95687df0632669eefa76870bf4edf615ddb9118afa77b467518fdb760a7041045ec31121d3dcb84db17483ffc02cfb9d09e13c98c11169cdd30b1b5

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

          Filesize

          374KB

          MD5

          730f2f4f1c26912b59156d062af8de6f

          SHA1

          3d32f7e5e0ef9424c4d309109d3c765d3fb95091

          SHA256

          b098486c49a73591ca003f20276f1ca33605618a7167407d9f3f096bc7ec930d

          SHA512

          c2e7f694c1c28724ad98abe8b5493cb4b8270406652d32d0d0c3e20a14dff19e12e815ef9bd0f1fd11aecc9bd4220c6cdaff39233a48338c7dd6d986764692fe

        • memory/296-7-0x0000000000260000-0x00000000002C4000-memory.dmp

          Filesize

          400KB

        • memory/296-8-0x000007FEF61A0000-0x000007FEF6B8C000-memory.dmp

          Filesize

          9.9MB

        • memory/296-19-0x000007FEF61A0000-0x000007FEF6B8C000-memory.dmp

          Filesize

          9.9MB

        • memory/296-1370-0x000007FEF61A0000-0x000007FEF6B8C000-memory.dmp

          Filesize

          9.9MB

        • memory/1736-0-0x000007FEF61A3000-0x000007FEF61A4000-memory.dmp

          Filesize

          4KB

        • memory/1736-1-0x0000000000C10000-0x0000000000C74000-memory.dmp

          Filesize

          400KB