Analysis

  • max time kernel
    152s
  • max time network
    72s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    04-12-2022 17:51

General

  • Target

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0.exe

  • Size

    172KB

  • MD5

    1e149467daa9277f9a2e36ad1be60090

  • SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

  • SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

  • SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • SSDEEP

    3072:9YTA7Jhf//HJG3xwQhy2rXSzrpuUODQc:9P1pGBV0FzrTOF

Score
10/10

Malware Config

Signatures

  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 29 IoCs
  • Maps connected drives based on registry 3 TTPs 4 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Drops autorun.inf file 1 TTPs 1 IoCs

    Malware can abuse Windows Autorun to spread further via attached volumes.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0.exe
    "C:\Users\Admin\AppData\Local\Temp\a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1488
    • C:\Users\Admin\AppData\Local\Temp\a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0.exe
      74
      2⤵
      • Modifies visiblity of hidden/system files in Explorer
      • Loads dropped DLL
      • Adds Run key to start application
      • Maps connected drives based on registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2032
      • C:\Users\Admin\coutuit.exe
        "C:\Users\Admin\coutuit.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1480
        • C:\Users\Admin\coutuit.exe
          74
          4⤵
          • Modifies visiblity of hidden/system files in Explorer
          • Executes dropped EXE
          • Adds Run key to start application
          • Maps connected drives based on registry
          • Drops autorun.inf file
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of SetWindowsHookEx
          PID:616

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Replication Through Removable Media

1
T1091

Persistence

Hidden Files and Directories

1
T1158

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Hidden Files and Directories

1
T1158

Modify Registry

2
T1112

Discovery

Query Registry

1
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

2
T1082

Lateral Movement

Replication Through Removable Media

1
T1091

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\coutuit.exe
    Filesize

    172KB

    MD5

    1e149467daa9277f9a2e36ad1be60090

    SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

    SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

    SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • C:\Users\Admin\coutuit.exe
    Filesize

    172KB

    MD5

    1e149467daa9277f9a2e36ad1be60090

    SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

    SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

    SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • C:\Users\Admin\coutuit.exe
    Filesize

    172KB

    MD5

    1e149467daa9277f9a2e36ad1be60090

    SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

    SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

    SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • \Users\Admin\coutuit.exe
    Filesize

    172KB

    MD5

    1e149467daa9277f9a2e36ad1be60090

    SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

    SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

    SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • \Users\Admin\coutuit.exe
    Filesize

    172KB

    MD5

    1e149467daa9277f9a2e36ad1be60090

    SHA1

    4561d52a35b80e9634633a30a6d55ebf429fd368

    SHA256

    a5ca923dceb0aee349e59666f287352d18f9dc79234fbe02d935ad2ccc8cdfc0

    SHA512

    d55acbc094757e15f33e89fbb047205f6421af4a1a4e5f638e2e6e7be1f28d8f5bf789cd0a80852894e0e30f12bbca39ae73bdc8d7cb993a26aefef6fce3c285

  • memory/616-81-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/616-78-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/616-72-0x00000000004010EC-mapping.dmp
  • memory/1480-66-0x0000000000000000-mapping.dmp
  • memory/2032-56-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/2032-63-0x0000000076681000-0x0000000076683000-memory.dmp
    Filesize

    8KB

  • memory/2032-62-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/2032-59-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/2032-80-0x0000000000400000-0x0000000000413000-memory.dmp
    Filesize

    76KB

  • memory/2032-57-0x00000000004010EC-mapping.dmp