Analysis

  • max time kernel
    94s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2024 08:37

General

  • Target

    2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe

  • Size

    72KB

  • MD5

    f262fcd17104f903e343fe739502f0d6

  • SHA1

    90f1aebffe5e3966a0ce94c9dc9ded1d9dcf8c61

  • SHA256

    620d13c4a73f2fef68c67391ab2cfa00dbe4443a673352df13cb265c2f00d5e1

  • SHA512

    7f6a336e3c62a59709f81e7ec39699086b514a493b1e51d00fc990459ce378e172de6bd7c98145e43a410ae963bd47ff4625ab0692aaf1fcee40c6db1658c531

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT6:ZRpAyazIliazT6

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 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-03_f262fcd17104f903e343fe739502f0d6_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1400
    • 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:2484

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

    392KB

    MD5

    870724f2d942b3676711b5bd44aeca60

    SHA1

    d9e6559ef4dd088a376da7cca69c604643e53308

    SHA256

    acb3ae71473c1cf5a54701dbc4eb8ea9ed8851a9321523689ab40936f64eef3d

    SHA512

    2fe0442f9a57a6116a7768614ab0b6984dfe667fbf36c900598176c1036862e83688fd43a82a9ae2d7f9f19599e31620d5cdf00845781740938cb587439a8114

  • C:\Users\Admin\AppData\Local\Temp\1rhFcMJBx9d0lGP.exe

    Filesize

    72KB

    MD5

    6517c0b003e7bffc76f5588efb9db530

    SHA1

    3a3114c52ff675cd0b92fc86f58775aeb0e08880

    SHA256

    f1f5aec3383abd1e388e556d73ad5fc801b829cf7412d262fdf2664960760370

    SHA512

    e1c3977a3e628a9ab2f51637c082eda629342c02d36ab40481ed95ba7aef9ac729ce248cc18c9b1fe5de49170771a4fbfffd3aa40f4790293114300a4e79f527

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432