Analysis

  • max time kernel
    145s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-06-2024 07:42

General

  • Target

    2024-06-01_948fc3db93f39956720672a129137317_bkransomware.exe

  • Size

    168KB

  • MD5

    948fc3db93f39956720672a129137317

  • SHA1

    d495202dc69bc9e0eaf51cddeca0d5168417eda9

  • SHA256

    460b7f1e0a91b9c5ab96217d923d2f164b439fbbfac76e1245ca8d08ebe47216

  • SHA512

    c6ded6b00ec81a418cb3b43de9fb92b7320477e8aecaf779538d062e0d6204e290c37f8f97c1ed7f1df3ea9ddd9df0002ac2f786b800e883b8dab329a11200bd

  • SSDEEP

    3072:ZRpAyazIliazTIR5nf2BKJUD8yMujohKNUDAmQoBCYA:xZ8azUR5nfZi8yMuGAZoHA

Malware Config

Signatures

  • Executes dropped EXE 2 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 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-01_948fc3db93f39956720672a129137317_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-01_948fc3db93f39956720672a129137317_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2136
    • C:\Users\Admin\AppData\Local\Temp\KKAs03FUKDjWfJb.exe
      C:\Users\Admin\AppData\Local\Temp\KKAs03FUKDjWfJb.exe
      2⤵
      • Executes dropped EXE
      PID:4504
    • C:\Windows\CTS.exe
      "C:\Windows\CTS.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:3768
  • 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=4048 --field-trial-handle=2292,i,2103142837140538807,15881446839139365070,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:2256

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

      Filesize

      789KB

      MD5

      b23cdfcf9b0015c42cbd20381fb13a60

      SHA1

      658ac2c6b8daa3bf3564883ca9c6fafabc78dd97

      SHA256

      0620943920a63ac48ddb5309e5480b85343778ef21cc182e56f46b010585010a

      SHA512

      93a5eacedda5bfc6c3a865aee0f452b2409d565625eacaa777e4d9a089d28746d143036dedb16b0a52522ff2e46ffa9bc3cf1a501cf6e76a13fcd464458d26f5

    • C:\Users\Admin\AppData\Local\Temp\KKAs03FUKDjWfJb.exe

      Filesize

      97KB

      MD5

      0655a0af4a2ff9bf591f614ba8f5721f

      SHA1

      b10d53dccec179109aff61b86ecca65be816f3c4

      SHA256

      d1a473a0dd813bd3565b810dcb8ff8bc7907478a994c564d55200925894e0d32

      SHA512

      9051043e6711b1f1b73f4137a8e4c16362c6be5d6c01b15f0430920ce096adf0b9f6a344462aadc5c2847ab5c0d9682df13803351449462dc5dda6059319d45f

    • C:\Windows\CTS.exe

      Filesize

      71KB

      MD5

      f9d4ab0a726adc9b5e4b7d7b724912f1

      SHA1

      3d42ca2098475924f70ee4a831c4f003b4682328

      SHA256

      b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

      SHA512

      22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432