Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-05-2024 06:35

General

  • Target

    2024-05-27_96d4356130a5c6bdafa20c33e6864d57_bkransomware.exe

  • Size

    71KB

  • MD5

    96d4356130a5c6bdafa20c33e6864d57

  • SHA1

    ad14419cb285d90a77f2f413edac0467b89f70b7

  • SHA256

    f6aa4fbf74676f93337a17e15274ffc9450c2a627f38fe38e224f9de9da18e43

  • SHA512

    ff9e86c8014055878ab183c6d74c0f2bf15a7c5be5ffebba116d8f3f634a067cadd9363d0b463e82bffb7f74eccceafb9c6d843ac77695c6820128ca610c16e4

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTU8:ZRpAyazIliazTD

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_96d4356130a5c6bdafa20c33e6864d57_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-27_96d4356130a5c6bdafa20c33e6864d57_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3748
    • 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:4004

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

    392KB

    MD5

    38e0dd7569083ffa586fd697691fa9e1

    SHA1

    f3e40b3bd5ce90a460859c5201028e477e865df5

    SHA256

    633a4b7fc3c22e17c97666ee6a7169bc0c5c1ade80ac9592152405d9bafc7bbf

    SHA512

    67a0a1aa85f0e16d77d31ea242ce12c6c8291738cd30711f6ba20080a09c0cf134a27dc41164e1fcdde190bc081f1057f1a06632422c1877c026ebf4e5165271

  • C:\Users\Admin\AppData\Local\Temp\HqOBCStKVL52vRM.exe
    Filesize

    71KB

    MD5

    0d797156eb87a6e80a8f0db0553a7738

    SHA1

    4a0c3a561a06f630b6c5431d93fd45c9c99a7df6

    SHA256

    326a82c08e46c65ef8a206fa059aa06940aabc34addc4832674930b019c7980d

    SHA512

    e7d7b228f9ef68afecd07d69f6ee749a6d22a4085584d8be3e3bb4ac1e438d475b6889d205408fded56e983df7f407fa137cb346f9a5818f574bc5a41bd4a3b3

  • C:\Windows\CTS.exe
    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432