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Resubmissions

31/03/2024, 14:49

240331-r687xsec77 10

29/03/2024, 09:29

240329-lf9swaeg87 10

29/03/2024, 08:58

240329-kw8ebaed26 10

29/03/2024, 08:57

240329-kwtadsed22 10

29/03/2024, 08:49

240329-krew7sec34 10

Analysis

  • max time kernel
    1566s
  • max time network
    1569s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    29/03/2024, 09:29

General

  • Target

    antivirus.exe

  • Size

    144KB

  • MD5

    4016477fd044882c78f3c1a47d7322e1

  • SHA1

    6c75ffa25ef2d1d6a658ff415b2e47964032fc6a

  • SHA256

    fbbaef754d6dafaaf32ae5e7937135fe81075806e5e2b0db1d6f9441a1cd8633

  • SHA512

    17706a8238817e135ffe378e60e1e52964a00aeee6c6b9bc7f288a0390ae97d958f053cf693a4d829a35acbe32e3ab9599c13150a3155c671490736e88d19df1

  • SSDEEP

    3072:xokEUyr9ql5n3yU6S4M5Er8zwIMsoE0WNOBKHAHp+FBZ+:er9ql53y04QEwzh0FaAHQLZ

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 4 IoCs
  • Deletes shadow copies 2 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.

  • 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
  • Sets desktop wallpaper using registry 2 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 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\antivirus.exe
    "C:\Users\Admin\AppData\Local\Temp\antivirus.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1912
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • 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:2404
      • 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:1636
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2668
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:988
      • 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:276
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1700
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2852
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2840
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2060
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\hahaha.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:984
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2624
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2092
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:828
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1460

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        144KB

        MD5

        4016477fd044882c78f3c1a47d7322e1

        SHA1

        6c75ffa25ef2d1d6a658ff415b2e47964032fc6a

        SHA256

        fbbaef754d6dafaaf32ae5e7937135fe81075806e5e2b0db1d6f9441a1cd8633

        SHA512

        17706a8238817e135ffe378e60e1e52964a00aeee6c6b9bc7f288a0390ae97d958f053cf693a4d829a35acbe32e3ab9599c13150a3155c671490736e88d19df1

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

        Filesize

        63B

        MD5

        45dfa78907ccd5154a672941b7fd7805

        SHA1

        c96e039c5d260e3fc61d65da6718d3a832a182fd

        SHA256

        7d6a89c0a71eb6607c0f9226cbdbc241a154a49e463e599ea8ff126c161ad6af

        SHA512

        45b88dc885c14920f7e309566475c1c0d35b43dfade79ae951d41b422a4cba511f36b6305f0fde21af780399929f529661e1e9f1bcf0190e2b73472ed9950f2b

      • memory/1912-0-0x0000000001280000-0x00000000012AA000-memory.dmp

        Filesize

        168KB

      • memory/1912-1-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

        Filesize

        9.9MB

      • memory/1912-423-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

        Filesize

        9.9MB

      • memory/2404-7-0x0000000000C80000-0x0000000000CAA000-memory.dmp

        Filesize

        168KB

      • memory/2404-8-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

        Filesize

        9.9MB

      • memory/2404-10-0x000000001AB70000-0x000000001ABF0000-memory.dmp

        Filesize

        512KB

      • memory/2404-424-0x000007FEF5A60000-0x000007FEF644C000-memory.dmp

        Filesize

        9.9MB

      • memory/2404-425-0x000000001AB70000-0x000000001ABF0000-memory.dmp

        Filesize

        512KB