Resubmissions

16-03-2024 17:17

240316-vtswysfd2y 10

16-03-2024 15:31

240316-syg9xafg39 10

15-03-2024 08:15

240315-j5rmgsbg5z 10

Analysis

  • max time kernel
    523s
  • max time network
    453s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16-03-2024 17:17

General

  • Target

    2e8af1ad4bb1e9f1bfdd3a04bf28363bbcdb3653e6aa4864f61b09c050378d51.exe

  • Size

    31KB

  • MD5

    3fdd9b2402350844b482aa6076e18d22

  • SHA1

    81034b4deb144ecdf21cb213e455a84ea319812c

  • SHA256

    2e8af1ad4bb1e9f1bfdd3a04bf28363bbcdb3653e6aa4864f61b09c050378d51

  • SHA512

    cedd5b9899cac6cce702c011ea7b9168ede0fe3e83a9ccd20f4e42f726c9b0a78ada6bf8b6863aeafc14d62500af8e347c4627b69233f96a2ae4df02c21549a4

  • SSDEEP

    384:y3Mg/bqo284ujNI2pl6VwTwJrjr91CzJ8lC12ntnGeC:Iqo27uj+2pIw4rjr9kJ8lCEtGeC

Malware Config

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.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (191) 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.

  • 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
  • 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 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 49 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\2e8af1ad4bb1e9f1bfdd3a04bf28363bbcdb3653e6aa4864f61b09c050378d51.exe
    "C:\Users\Admin\AppData\Local\Temp\2e8af1ad4bb1e9f1bfdd3a04bf28363bbcdb3653e6aa4864f61b09c050378d51.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1584
    • 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:968
      • 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:4436
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:3200
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4840
      • 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:1288
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3844
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1248
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4184
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3944
      • 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:4380
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4048
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1608
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:4360
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4468

    Network

    MITRE ATT&CK Matrix ATT&CK v13

    Execution

    Command and Scripting Interpreter

    1
    T1059

    Defense Evasion

    Indicator Removal

    3
    T1070

    File Deletion

    3
    T1070.004

    Modify Registry

    1
    T1112

    Credential Access

    Unsecured Credentials

    1
    T1552

    Credentials In Files

    1
    T1552.001

    Discovery

    Query Registry

    3
    T1012

    System Information Discovery

    3
    T1082

    Peripheral Device Discovery

    1
    T1120

    Collection

    Data from Local System

    1
    T1005

    Impact

    Inhibit System Recovery

    4
    T1490

    Defacement

    1
    T1491

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      31KB

      MD5

      3fdd9b2402350844b482aa6076e18d22

      SHA1

      81034b4deb144ecdf21cb213e455a84ea319812c

      SHA256

      2e8af1ad4bb1e9f1bfdd3a04bf28363bbcdb3653e6aa4864f61b09c050378d51

      SHA512

      cedd5b9899cac6cce702c011ea7b9168ede0fe3e83a9ccd20f4e42f726c9b0a78ada6bf8b6863aeafc14d62500af8e347c4627b69233f96a2ae4df02c21549a4

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

      76B

      MD5

      fdc5e26dd3c5a9eb5560d1d5e836a612

      SHA1

      d2292b9165636c5cca4ac33a09ba9c23eaa814d5

      SHA256

      5a90da73670cbedf2f45bf010aafb018ce6e8b8f8c7ea6e7b2d4cd9cb0ea0326

      SHA512

      3c6d61a7a9554b0de91adaf8773df48fe236d29fb7bbde358fdb4639bd64a576341684dbba447a1e101ea89a717739d8ebceacc24f26c59dda37b67bbfd5e1a2

    • memory/968-15-0x00007FF99B3A0000-0x00007FF99BE61000-memory.dmp
      Filesize

      10.8MB

    • memory/968-259-0x00007FF99B3A0000-0x00007FF99BE61000-memory.dmp
      Filesize

      10.8MB

    • memory/1584-0-0x0000000000F70000-0x0000000000F7E000-memory.dmp
      Filesize

      56KB

    • memory/1584-2-0x00007FF99B3A0000-0x00007FF99BE61000-memory.dmp
      Filesize

      10.8MB

    • memory/1584-14-0x00007FF99B3A0000-0x00007FF99BE61000-memory.dmp
      Filesize

      10.8MB