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Analysis

  • max time kernel
    143s
  • 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
    07/06/2024, 22:43

General

  • Target

    2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe

  • Size

    135KB

  • MD5

    77d75393a71b68e6d4315225d2776c12

  • SHA1

    88124a6e0dade8408d687b9bcac066275c8aea8e

  • SHA256

    a697fa27a6a63f248d12c4716bf5feaf678c09aeea695bd8e8a0fd8829e94287

  • SHA512

    22dd2c6a7fe273abe440d2463d3b04e28e79d8ce1d7d9b266c6f56ea075065369f6bf5b2941a360dee313db55bded95386850e806193dc4c813b60848adac16f

  • SSDEEP

    3072:ZRpAyazIliazTJM8yKI7swt99g0kFZeAmkD5zXv:xZ8azFdyLTt9UFcAmkZ

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 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-07_77d75393a71b68e6d4315225d2776c12_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3452
    • C:\Users\Admin\AppData\Local\Temp\m8FhYtsJ57ViW4Q.exe
      C:\Users\Admin\AppData\Local\Temp\m8FhYtsJ57ViW4Q.exe
      2⤵
      • Executes dropped EXE
      PID:1104
    • 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:3832
  • 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=1416 --field-trial-handle=3240,i,13319578961094268484,16557498665191861597,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:4836

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      789KB

      MD5

      612d539f332504d27446f9b46cb954c0

      SHA1

      0c87d98d00686e6d12123613cd47f8b45684397e

      SHA256

      dd153332eb24465ddab430b54802fde1d3ed05568c8641633c40b1342fde708e

      SHA512

      08cb2b99300e2919657898dba8a097cdd8ce1b60a48aa5e9db8177daef87b0433ede08a6432042f882c4faa115adb0d6bb018965fada99f281d574f134e121e1

    • C:\Users\Admin\AppData\Local\Temp\m8FhYtsJ57ViW4Q.exe

      Filesize

      64KB

      MD5

      a32a382b8a5a906e03a83b4f3e5b7a9b

      SHA1

      11e2bdd0798761f93cce363329996af6c17ed796

      SHA256

      75f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346

      SHA512

      ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c

    • C:\Windows\CTS.exe

      Filesize

      71KB

      MD5

      f9d4ab0a726adc9b5e4b7d7b724912f1

      SHA1

      3d42ca2098475924f70ee4a831c4f003b4682328

      SHA256

      b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

      SHA512

      22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432