Analysis

  • max time kernel
    121s
  • max time network
    121s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    12-06-2024 18:03

General

  • Target

    2024-06-12_a025e29726722d69fea098d6f481bb85_bkransomware.exe

  • Size

    135KB

  • MD5

    a025e29726722d69fea098d6f481bb85

  • SHA1

    b725653b4ecaf4abdedf430d803ab358267858df

  • SHA256

    3180ad517578b8327517e020661dd02304e534181496344dedbca86f4290e180

  • SHA512

    de99f4485a5bd18e0665e278515a4887705783312b2a9e5c8300945c9d5b0e0df3d725aabe05636f5021a644242abc6dbe8df6541d440d4c6da0027fa05a3d72

  • SSDEEP

    3072:ZhpAyazIlyazTP+92PXRyWLxO6I1UsvPGVA:hZMazj+0JLxOX1KW

Malware Config

Signatures

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-12_a025e29726722d69fea098d6f481bb85_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-12_a025e29726722d69fea098d6f481bb85_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:2288
    • C:\Users\Admin\AppData\Local\Temp\95wFoU3S4siUM3X.exe
      C:\Users\Admin\AppData\Local\Temp\95wFoU3S4siUM3X.exe
      2⤵
      • Executes dropped EXE
      PID:2060
    • 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:2916

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\95wFoU3S4siUM3X.exe

    Filesize

    135KB

    MD5

    a33fff9ccf410f818d2a7fdd67da07a6

    SHA1

    3d7225c264ae7e88b7932c2c37f40048e8be375b

    SHA256

    f2af3ae853de1847178215797f8bc5d7c3a585bc39adaa883bc5d99bf3b7b9e0

    SHA512

    76400809858c23867da039c443910c3e6b30e4275f0396fa4233366eb7d0cbd3b36e0e8f7ded9970a961ba6dfd26c7e8fa5879996a257390d66578b296b02f07

  • C:\Users\Admin\AppData\Local\Temp\95wFoU3S4siUM3X.exe

    Filesize

    64KB

    MD5

    e97c622b03fb2a2598bf019fbbe29f2c

    SHA1

    32698bd1d3a0ff6cf441770d1b2b816285068d19

    SHA256

    5c1af46c7300e87a73dacf6cf41ce397e3f05df6bd9c7e227b4ac59f85769160

    SHA512

    db70c62fb35a8e5b005f13b57c1ebbf6c465f6ff0524422294c43e27fb4aa79379dc1e300ad11dc2354405c43b192ae06b91c0f525a1f2617e4d14673651a87d

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25