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Analysis

  • max time kernel
    120s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    11/05/2024, 15:33

General

  • Target

    2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe

  • Size

    262KB

  • MD5

    c4de79253987ef24561160b0fda73dee

  • SHA1

    ad307e6ff2f85567effc74de749f40600ff1615d

  • SHA256

    9b04e4fc6e74cd2505d574668d0f88d79679af1f12d380d2136f2a785056d9ea

  • SHA512

    22ba6ef98d1c3023e77dd2b3989b626da6fc8b57881da07474be933d041a72be1205ebd8c33964d24080b7ccb6ae75540e257fda414f60bc9302ec939ac8d83e

  • SSDEEP

    6144:hZMazhUuJd8Al7t3t891EMu+dKCwLa+gavuMU:hS0WuvrJd8/Es4ana2MU

Malware Config

Signatures

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 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 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-11_c4de79253987ef24561160b0fda73dee_bkransomware.exe"
    1⤵
    • Loads dropped DLL
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2084
    • C:\Users\Admin\AppData\Local\Temp\l3D5IFGWcIeg1nn.exe
      C:\Users\Admin\AppData\Local\Temp\l3D5IFGWcIeg1nn.exe
      2⤵
      • Executes dropped EXE
      PID:2668
    • 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:1336

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25

  • \Users\Admin\AppData\Local\Temp\l3D5IFGWcIeg1nn.exe

    Filesize

    191KB

    MD5

    94a363cd532d88ac33997c25657a19b5

    SHA1

    a98f1a8361d0183651c0ef457b9ac4339e429bea

    SHA256

    13b98844b2fa4a39a4d8ebb414fc79450d5ab4f0c8f5141ac06d40b2a0431ea4

    SHA512

    3b1c87a67f63e4276453ec1e322f0c13896dd0524ef35f4e4037a481ce354feaa98440f85b784c0b90a900c59ef115654f687457180ea433ea0100427f5c26f5