Analysis

  • max time kernel
    155s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-10-2022 20:25

General

  • Target

    99c89b7539f253d895631e0f4371a29e0aed7a66b0bc6a0bbdbbfcd60dda7136.exe

  • Size

    950KB

  • MD5

    66d7ba529e622874ade904cd081c0166

  • SHA1

    2ff4dda80a4e4aa9390097f689c0e0bcce1c2b76

  • SHA256

    99c89b7539f253d895631e0f4371a29e0aed7a66b0bc6a0bbdbbfcd60dda7136

  • SHA512

    280df746e26e3aab513364385fdafc4cfed861d2aee56fac9e78bd707d65f4873afc7e6ecae1fee589dd7fb1c372d1db8e7839ddd85fed14fefda10591cf1714

  • SSDEEP

    6144:a+nglw9ayQv3ahvyn/PU7O0KXgTTSj9ltfgIg+oa+ZEN2ERBOzi0q5Lm17z6qRBT:rjS3Yvyn/0TkLF+I0q5Lvqsgvzqa

Score
10/10

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Adds Run key to start application 2 TTPs 4 IoCs
  • Drops file in System32 directory 3 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 1 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 WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\99c89b7539f253d895631e0f4371a29e0aed7a66b0bc6a0bbdbbfcd60dda7136.exe
    "C:\Users\Admin\AppData\Local\Temp\99c89b7539f253d895631e0f4371a29e0aed7a66b0bc6a0bbdbbfcd60dda7136.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:5020
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c reg ADD HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run /v freizer /t REG_SZ /d C:\WINDOWS\system32\freizer.exe /f
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2080
      • C:\Windows\SysWOW64\reg.exe
        reg ADD HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run /v freizer /t REG_SZ /d C:\WINDOWS\system32\freizer.exe /f
        3⤵
        • Adds Run key to start application
        PID:2552
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c reg ADD HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run /v svchost /t REG_SZ /d C:\WINDOWS\system32\svchost.exe /f
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2256
      • C:\Windows\SysWOW64\reg.exe
        reg ADD HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run /v svchost /t REG_SZ /d C:\WINDOWS\system32\svchost.exe /f
        3⤵
        • Adds Run key to start application
        PID:2028
    • C:\windows\temp\33224.exe
      "C:\windows\temp\33224.exe"
      2⤵
      • Executes dropped EXE
      PID:3840

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Windows\Temp\33224.exe

    Filesize

    26KB

    MD5

    37f7b0efb7593d4f636e5a106e8a09b0

    SHA1

    dff40ff99d3dc9510f1db10ffe219039892f5808

    SHA256

    63bdaa0b87995260c596956694c5a2111d855032cbd8a1f2e9a7e9fc8bbfc03f

    SHA512

    9eb49cead844c69836dfe1f73258b38c90ef487de18cd8e9687cc335c47b345df3d56e96beed4ea17e09715b578fcbf7f9c10cc4786e1b97cdbc3cee0763089c

  • C:\windows\temp\33224.exe

    Filesize

    26KB

    MD5

    37f7b0efb7593d4f636e5a106e8a09b0

    SHA1

    dff40ff99d3dc9510f1db10ffe219039892f5808

    SHA256

    63bdaa0b87995260c596956694c5a2111d855032cbd8a1f2e9a7e9fc8bbfc03f

    SHA512

    9eb49cead844c69836dfe1f73258b38c90ef487de18cd8e9687cc335c47b345df3d56e96beed4ea17e09715b578fcbf7f9c10cc4786e1b97cdbc3cee0763089c

  • memory/2028-134-0x0000000000000000-mapping.dmp

  • memory/2080-132-0x0000000000000000-mapping.dmp

  • memory/2256-133-0x0000000000000000-mapping.dmp

  • memory/2552-135-0x0000000000000000-mapping.dmp

  • memory/3840-136-0x0000000000000000-mapping.dmp