Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-02-2023 10:50

General

  • Target

    tmp.exe

  • Size

    6KB

  • MD5

    48a13c217c965ed66e5d6c018b89217b

  • SHA1

    2d8b62d02c73e7e2fc367fc64b51350564c7acb4

  • SHA256

    8650dcaece1489d98b7f6782ae638de33797f2a1018f949ec270054f0893aea0

  • SHA512

    b0e5556ad36a74ddfbbbfcd94f04635a614bc70d159aaab8fb540ecd0d823e14c2ed8687b95943cd992b434c37c9bfaa04db79c62f9d654b85616f45d275802a

  • SSDEEP

    96:4rs7rOMGPGDupbGL7g8y23I6mUUWH78kVl6l2xzNt:oKrsPGDupKL7nNhVlk2T

Malware Config

Extracted

Family

purecrypter

C2

https://onedrive.live.com/download?cid=A113DD34A0D77810&resid=A113DD34A0D77810%21121&authkey=APUVM8ZXD6Jpjd0

Extracted

Family

remcos

Botnet

RemoteHost

C2

top.thekillforabuse1.xyz:1068

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-R762FE

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Remcos

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • PureCrypter

    PureCrypter is a .NET malware loader first seen in early 2021.

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

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

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

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4800
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2444
    • C:\Users\Admin\AppData\Local\Temp\tmp.exe
      C:\Users\Admin\AppData\Local\Temp\tmp.exe
      2⤵
        PID:2672

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Registry Run Keys / Startup Folder

    1
    T1060

    Defense Evasion

    Modify Registry

    1
    T1112

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/2444-140-0x0000000007510000-0x0000000007B8A000-memory.dmp
      Filesize

      6.5MB

    • memory/2444-136-0x0000000004E60000-0x0000000005488000-memory.dmp
      Filesize

      6.2MB

    • memory/2444-134-0x0000000000000000-mapping.dmp
    • memory/2444-135-0x00000000023A0000-0x00000000023D6000-memory.dmp
      Filesize

      216KB

    • memory/2444-139-0x0000000005C90000-0x0000000005CAE000-memory.dmp
      Filesize

      120KB

    • memory/2444-137-0x0000000005590000-0x00000000055F6000-memory.dmp
      Filesize

      408KB

    • memory/2444-141-0x0000000006180000-0x000000000619A000-memory.dmp
      Filesize

      104KB

    • memory/2444-138-0x0000000005600000-0x0000000005666000-memory.dmp
      Filesize

      408KB

    • memory/2672-142-0x0000000000000000-mapping.dmp
    • memory/2672-143-0x0000000000400000-0x000000000047F000-memory.dmp
      Filesize

      508KB

    • memory/2672-144-0x0000000000400000-0x000000000047F000-memory.dmp
      Filesize

      508KB

    • memory/2672-145-0x0000000000400000-0x000000000047F000-memory.dmp
      Filesize

      508KB

    • memory/2672-146-0x0000000000400000-0x000000000047F000-memory.dmp
      Filesize

      508KB

    • memory/2672-147-0x0000000000400000-0x000000000047F000-memory.dmp
      Filesize

      508KB

    • memory/4800-133-0x0000000007480000-0x00000000074A2000-memory.dmp
      Filesize

      136KB

    • memory/4800-132-0x0000000000150000-0x0000000000158000-memory.dmp
      Filesize

      32KB