Resubmissions

13-07-2024 09:54

240713-lxcvgawdmn 10

13-07-2024 09:52

240713-lv46yawdkj 10

13-07-2024 09:46

240713-lrz3tayajc 10

Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-07-2024 09:46

General

  • Target

    bb5ca9d8de51734dbd14dc081c7c892d819cd14fafd7ccd62849d70f9e679369.exe

  • Size

    205KB

  • MD5

    62e53bc5aa5f2a70a54e328bff51505f

  • SHA1

    e7deceee97a09d539d81eb91f988ece5e2a2ff51

  • SHA256

    bb5ca9d8de51734dbd14dc081c7c892d819cd14fafd7ccd62849d70f9e679369

  • SHA512

    a676dd284188271be1760ed1edd3320341713662aba1c615481f256007e614e58756a7b6a565beed777230c2ae829c561e3bf3510921ad6495d3776cfdfaa793

  • SSDEEP

    6144:+B4mr9NzqHW7V5V9w/UIRZizI1aqebq/lsyp:+B40qHW7nU/pZmiXqy

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 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 (206) 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
  • 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 39 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\bb5ca9d8de51734dbd14dc081c7c892d819cd14fafd7ccd62849d70f9e679369.exe
    "C:\Users\Admin\AppData\Local\Temp\bb5ca9d8de51734dbd14dc081c7c892d819cd14fafd7ccd62849d70f9e679369.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2396
    • 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:2720
      • 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:3016
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2676
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2516
      • 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:4988
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:532
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2712
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:692
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1388
      • 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:3064
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4980
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4164
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:3620
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:5108

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      205KB

      MD5

      62e53bc5aa5f2a70a54e328bff51505f

      SHA1

      e7deceee97a09d539d81eb91f988ece5e2a2ff51

      SHA256

      bb5ca9d8de51734dbd14dc081c7c892d819cd14fafd7ccd62849d70f9e679369

      SHA512

      a676dd284188271be1760ed1edd3320341713662aba1c615481f256007e614e58756a7b6a565beed777230c2ae829c561e3bf3510921ad6495d3776cfdfaa793

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

      Filesize

      844B

      MD5

      a23e76ce33adf72409fb0c43393d3087

      SHA1

      502620245be1d0912ab9c4fb5390ab14e27778a8

      SHA256

      88702c38b8bea9555a13ae747cbfdf2947fff6060f4fef75486025e0152ddf3a

      SHA512

      24fdd6761b29eb62ecfefa7a5ed15705645c3a303ada3728823382ba38e08eae12f15840fb65361391cff1ba4cad55fdfb6e0144c9e95b7e7fbe928319d732bb

    • memory/2396-0-0x00000000002D0000-0x0000000000308000-memory.dmp

      Filesize

      224KB

    • memory/2396-1-0x00007FF914C93000-0x00007FF914C95000-memory.dmp

      Filesize

      8KB

    • memory/2720-14-0x00007FF914EE3000-0x00007FF914EE5000-memory.dmp

      Filesize

      8KB

    • memory/2720-481-0x00007FF914EE3000-0x00007FF914EE5000-memory.dmp

      Filesize

      8KB