Analysis

  • max time kernel
    120s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    03-06-2024 09:30

General

  • Target

    2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe

  • Size

    71KB

  • MD5

    3213c6175c2f1919a41d773c7d62d395

  • SHA1

    f89f3488d223f1ac843900669ea39f5faee55ad0

  • SHA256

    3ce3210ade8bb1bc8281b764344310669f6582c14900970aa5d97876893fd08e

  • SHA512

    678e84271b9b95101862ebda3d2fa7da8b4c9b71a3e01ca892bdb9956751c9e2c9859e84885e36b0021874924881a7c8b3e20aec3bc212e44a70c24320dc0a07

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT7:ZRpAyazIliazT7

Malware Config

Signatures

  • 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.

  • 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 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2180
    • 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:548

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\AqVKpp27m9KIvGl.exe

    Filesize

    71KB

    MD5

    5b9e752f11a2f0e7b80c96313650ddad

    SHA1

    41c5364f97b32ceff0becc49702a56b60bf8645a

    SHA256

    fd428d85e21799bfcd24cfba1449866e971e6bff040d2907b21dba8bcb37f5c4

    SHA512

    19495cd2f8b23616d15822f26582849d2b12919d1cceac14c1c3513850a25a3a0648c7096728f03978d00750438034b5e6e4eb58e9a4adfd3b68fffc4c34e618

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432