Analysis

  • max time kernel
    94s
  • max time network
    96s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-05-2024 06:31

General

  • Target

    2024-05-27_6f9920cf81c169dd0e4dad7ffedd4785_bkransomware.exe

  • Size

    71KB

  • MD5

    6f9920cf81c169dd0e4dad7ffedd4785

  • SHA1

    33f22f894b423c7956701307f6a7fb1721ad7756

  • SHA256

    d21df160b38e060e6552b89534a2e88f8b919a526a095a4307f0823db3e49b08

  • SHA512

    99dff00a65ed5c37d6b86e949618c2bf4aa00b076f44befa21d04301c3c1fa3653278001b28571d5d0677b92804fbb78ca4930571ba82da24757b3639c7d036c

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTG:ZRpAyazIliazTG

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\2024-05-27_6f9920cf81c169dd0e4dad7ffedd4785_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-27_6f9920cf81c169dd0e4dad7ffedd4785_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3816
    • 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:4768

Network

MITRE ATT&CK Matrix ATT&CK v13

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Modify Registry

1
T1112

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Collection

Data from Local System

1
T1005

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml
    Filesize

    394KB

    MD5

    6f74ef06da2705ffba5d7000ab5861a5

    SHA1

    bac6daccfad5377ece8b0c3a8094213cc8b02b79

    SHA256

    0b19d2417ab6b6f489bc3b43bb67068c0cf054343fe99d51bca13a84cf1cec58

    SHA512

    c5261ae42c1be608e8cf78e144bde806ffe4998880314119317f78fe52fe993a467797975f35cdf3de2ec64d62f18485a21cfc5cba234083e5d32911372cf9ed

  • C:\Users\Admin\AppData\Local\Temp\YSpBEsdHRLRAzC5.exe
    Filesize

    71KB

    MD5

    c02588eaf463b4f412e15a401bf24062

    SHA1

    73a460e4952628d15e0c5a49b9fbedb366b08589

    SHA256

    d3f871c7e9436e6bb878654719059308a5588de2ec7e1ee1d2b4a2edef0d6a9d

    SHA512

    30d6fb1d4723c8a2cbb100370c822df4747ae009ef1c2056083d0e8a73d8eb151e94cbffe42bfa51ac101b54e6655290f4682bfd84fabe4f7793391c6bcfca5b

  • C:\Windows\CTS.exe
    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432