Resubmissions

08-03-2024 11:13

240308-nbr4daee4y 10

07-03-2024 08:19

240307-j78nsage2v 10

07-03-2024 06:01

240307-gq7n2seh58 10

Analysis

  • max time kernel
    143s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-03-2024 08:19

General

  • Target

    mhh.exe

  • Size

    21KB

  • MD5

    777642d092240d5237da22123428a3ec

  • SHA1

    d9c614c189c9d0050b841229fb63c4e2552163c0

  • SHA256

    4494b5ea65a0e3f79d85579866d94cd65f2d42182fbe051ffe286692d07f94f4

  • SHA512

    cb052654d4965da94545ce14aa122c36e8dcb46ee714e5cec6341af392381b155792d1c0d6f2490158c52aeeaa72b65dba1cfd9bd784523f489df0ec5583a42a

  • SSDEEP

    384:9+3MLWHn3kIUf16NveXpjr9VsjuJJ/r91CruUem:9Cn3kIi6NEpjr9yj6/r9Srem

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 IoCs
  • 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).

  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 54 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\mhh.exe
    "C:\Users\Admin\AppData\Local\Temp\mhh.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1632
    • 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:3744
      • 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:2440
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3700 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:872

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      21KB

      MD5

      777642d092240d5237da22123428a3ec

      SHA1

      d9c614c189c9d0050b841229fb63c4e2552163c0

      SHA256

      4494b5ea65a0e3f79d85579866d94cd65f2d42182fbe051ffe286692d07f94f4

      SHA512

      cb052654d4965da94545ce14aa122c36e8dcb46ee714e5cec6341af392381b155792d1c0d6f2490158c52aeeaa72b65dba1cfd9bd784523f489df0ec5583a42a

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

      Filesize

      104B

      MD5

      7ce89e17fe514cd4e316f22cb21d341e

      SHA1

      a4bbe08d6a0f4b5089b96051b76e8ee563202390

      SHA256

      341aaae527b38ee958efa8dc5ea799ae948cd9267f4c0b1525d771cc5f088c44

      SHA512

      abcb28dc211da1c8e5a5001160ba74daebeb3a7556c53679e8bc53aef60dea391423823fdc0f1742d5cc2e337e9c3b71444c7d660d4920678daf3a81fb4c71ec

    • memory/1632-0-0x0000000000240000-0x000000000024C000-memory.dmp

      Filesize

      48KB

    • memory/1632-1-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

      Filesize

      10.8MB

    • memory/1632-69-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

      Filesize

      10.8MB

    • memory/3744-14-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

      Filesize

      10.8MB

    • memory/3744-70-0x00007FF9840E0000-0x00007FF984BA1000-memory.dmp

      Filesize

      10.8MB