Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250211-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250211-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/02/2025, 13:34

General

  • Target

    Windows_Security_Patch_KB5021130.exe

  • Size

    618KB

  • MD5

    4b7cb7621606abd6ffb6d38bafafb8e9

  • SHA1

    831c1c044cdf6515ce3444444242015e8b52271f

  • SHA256

    1744bcc45c4af593d5f3a72c972bc86d1158fb3408fe03db2d80d28b2c51d7c8

  • SHA512

    98437691db7c50e50ece2de7caffddfe6a5bcb17af69754377bfbb195865a1362df6e911dfd6b7c9ebb17f98fae27c743a8518dc9348bcc10962f53e87e89d3a

  • SSDEEP

    12288:BrtxWWIHuw2W41RfGx6UL7Uhd9BKcaQID8G3e3JgFaX:BanHubW4DfGUtKcadQ3JO0

Malware Config

Extracted

Family

remcos

Botnet

googlegroupaccount2

C2

107.174.65.146:1194

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    googlegroupaccount.exe

  • copy_folder

    googlegroupaccount

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    googlegroupaccount

  • mouse_option

    false

  • mutex

    Rmc-3UY7X7

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Remcos family
  • Detected Nirsoft tools 2 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 1 IoCs

    Password recovery tool for various web browsers

  • Downloads MZ/PE file 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 6 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: MapViewOfSection 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Windows_Security_Patch_KB5021130.exe
    "C:\Users\Admin\AppData\Local\Temp\Windows_Security_Patch_KB5021130.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3568
    • C:\Users\Admin\AppData\Local\Temp\Windows_Security_Patch_KB5021130.exe
      "C:\Users\Admin\AppData\Local\Temp\Windows_Security_Patch_KB5021130.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2832
      • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
        "C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2860
        • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
          "C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2912
          • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
            C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe /stext "C:\Users\Admin\AppData\Local\Temp\yqpkfavgc"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            PID:3792
          • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
            C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe /stext "C:\Users\Admin\AppData\Local\Temp\akcdfsghqukhw"
            5⤵
            • Executes dropped EXE
            • Accesses Microsoft Outlook accounts
            • System Location Discovery: System Language Discovery
            PID:1748
          • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
            C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe /stext "C:\Users\Admin\AppData\Local\Temp\kminglrbeccuywre"
            5⤵
            • Executes dropped EXE
            PID:3408
          • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe
            C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe /stext "C:\Users\Admin\AppData\Local\Temp\kminglrbeccuywre"
            5⤵
            • Executes dropped EXE
            • Suspicious use of UnmapMainImage
            PID:4560
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 4560 -s 12
              6⤵
              • Program crash
              PID:448
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 4560 -ip 4560
    1⤵
      PID:1416
    • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
      "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI1IiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODM0MTAiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NTUzNjg2NzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1NDcwMTg0MTQ4Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
      1⤵
      • System Location Discovery: System Language Discovery
      • System Network Configuration Discovery: Internet Connection Discovery
      PID:5076

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\yqpkfavgc

      Filesize

      4KB

      MD5

      18aaad48016d645ad439f178b27d0fb5

      SHA1

      b7b0f41b7e09b23ea220d2775242b779df74eec1

      SHA256

      e7a2cb979d8bccf31603e66a4b54542df0659773cc8718d532a1074d7f5ad558

      SHA512

      f2d6bd5dd24f3e69db77637eff8c74df749d13f259ea9e5036686c2371c97b1e046c5a01a41be8d076c9eda24bb8c6e72b63c1cbf02cd3d8f319bbff2e636464

    • C:\Users\Admin\AppData\Roaming\googlegroupaccount\googlegroupaccount.exe

      Filesize

      618KB

      MD5

      4b7cb7621606abd6ffb6d38bafafb8e9

      SHA1

      831c1c044cdf6515ce3444444242015e8b52271f

      SHA256

      1744bcc45c4af593d5f3a72c972bc86d1158fb3408fe03db2d80d28b2c51d7c8

      SHA512

      98437691db7c50e50ece2de7caffddfe6a5bcb17af69754377bfbb195865a1362df6e911dfd6b7c9ebb17f98fae27c743a8518dc9348bcc10962f53e87e89d3a

    • memory/1748-48-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/1748-51-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/1748-53-0x0000000000400000-0x0000000000462000-memory.dmp

      Filesize

      392KB

    • memory/2832-20-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2832-3-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2832-4-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2832-7-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2832-9-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2860-22-0x0000000073ADE000-0x0000000073ADF000-memory.dmp

      Filesize

      4KB

    • memory/2860-34-0x0000000073AD0000-0x0000000074280000-memory.dmp

      Filesize

      7.7MB

    • memory/2860-23-0x0000000073AD0000-0x0000000074280000-memory.dmp

      Filesize

      7.7MB

    • memory/2912-67-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-45-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-35-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-27-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-29-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-28-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-36-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-37-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-38-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-39-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-79-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-42-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-43-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-68-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-78-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-75-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-32-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-74-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-40-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-72-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-71-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-69-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/2912-62-0x0000000010000000-0x0000000010019000-memory.dmp

      Filesize

      100KB

    • memory/2912-66-0x0000000010000000-0x0000000010019000-memory.dmp

      Filesize

      100KB

    • memory/2912-65-0x0000000010000000-0x0000000010019000-memory.dmp

      Filesize

      100KB

    • memory/3568-17-0x0000000073AD0000-0x0000000074280000-memory.dmp

      Filesize

      7.7MB

    • memory/3568-0-0x0000000073ADE000-0x0000000073ADF000-memory.dmp

      Filesize

      4KB

    • memory/3568-1-0x0000000000290000-0x0000000000332000-memory.dmp

      Filesize

      648KB

    • memory/3568-2-0x00000000051E0000-0x0000000005784000-memory.dmp

      Filesize

      5.6MB

    • memory/3568-6-0x0000000073AD0000-0x0000000074280000-memory.dmp

      Filesize

      7.7MB

    • memory/3792-52-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/3792-50-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/3792-46-0x0000000000400000-0x0000000000478000-memory.dmp

      Filesize

      480KB

    • memory/4560-55-0x0000000000400000-0x0000000000424000-memory.dmp

      Filesize

      144KB