Analysis

  • max time kernel
    131s
  • max time network
    103s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-06-2024 00:24

General

  • Target

    2024-06-04_5fff1872ff95d09e59f17f44020f88e7_bkransomware.exe

  • Size

    71KB

  • MD5

    5fff1872ff95d09e59f17f44020f88e7

  • SHA1

    721f3517a4826dd530d28e1ddcf718383ecb4197

  • SHA256

    24cf61fc1f05c71abba8bba768cd57e1923aa612c787c9b7b7525158473b1c25

  • SHA512

    d1fc066814e1c45572803141eeb385a16dd30b643a6bf139fcf221193c833d4b085a3c63e212d7e374de17c1c18a49cc01005b00e0218ec9dd6b3f641f7c0dc9

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTK:ZhpAyazIlyazTK

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\2024-06-04_5fff1872ff95d09e59f17f44020f88e7_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-04_5fff1872ff95d09e59f17f44020f88e7_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:848
    • 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:4136

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

    d60f11cfc6761bdc3db0b904ede8c3e2

    SHA1

    e11b7e723cf63d2475131bfcbf46a177e0c4728c

    SHA256

    33b6781e804a30216d6155b2c6cbfb0bc538cd14adc548e0e95ef4a178ce52ec

    SHA512

    6c89a7c29b1d25f7f55d92af0e819365d153b74803c89c7cbba0248956a10e6da9c94b64b21215a8efb5dee3e7b953d1fb90a4cca66d3e5eaf85cf299cfb2965

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

    Filesize

    71KB

    MD5

    eda76a744b262248ac7bf5b070c949b8

    SHA1

    d7b68794dc1c353919cad40f2138252ab3d81e53

    SHA256

    9cec0460de8127b6b7e6c687b9bf3f53d61a6bb52e740f01e7e3c2c8998369eb

    SHA512

    c2c893717fc5cd9d1c822e381ab9bf080506920b109f6e252d950ac07303de3107d671528d133ade7330db0bb90c75e99b08fb238a460d59d96b4b5e24640106

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25