Analysis

  • max time kernel
    147s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    27-11-2024 16:13

General

  • Target

    050736376a0870aea56e2faf90ea34aa7af231c7b2d3d209bcac91628eec77c9.exe

  • Size

    1.5MB

  • MD5

    06a72ba35aaff1b3ab0ea4d3e2e65451

  • SHA1

    656564a2afc61d10e70d4833a0a57ef046709963

  • SHA256

    050736376a0870aea56e2faf90ea34aa7af231c7b2d3d209bcac91628eec77c9

  • SHA512

    cffae7007d5b2a972f0f2e3fc044b6fb96a91b1d4609f575c113b8920dabb986e9709a3a599cd32d30b8681838cff797b198e3a9fbb543b5622e36143ab9a79b

  • SSDEEP

    24576:RWGddPN4jN35Ohf8aT7JYR/MNPjWXY1Q7/VJJzsaz:RLLW15OOsYR/wjWXY1QZNz

Malware Config

Extracted

Family

remcos

Botnet

$100 MILLION

C2

craekuro.duckdns.org:1950

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-YHG91Z

  • 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

  • ModiLoader, DBatLoader

    ModiLoader is a Delphi loader that misuses cloud services to download other malicious families.

  • Modiloader family
  • Remcos

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

  • Remcos family
  • ModiLoader Second Stage 1 IoCs
  • Executes dropped EXE 9 IoCs
  • Loads dropped DLL 4 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 10 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.

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\050736376a0870aea56e2faf90ea34aa7af231c7b2d3d209bcac91628eec77c9.exe
    "C:\Users\Admin\AppData\Local\Temp\050736376a0870aea56e2faf90ea34aa7af231c7b2d3d209bcac91628eec77c9.exe"
    1⤵
    • Adds Run key to start application
    • System Location Discovery: System Language Discovery
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2716
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Public\Libraries\dlftfmtN.cmd" "
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:816
      • C:\Windows\SysWOW64\esentutl.exe
        C:\\Windows\\System32\\esentutl /y C:\\Windows\\System32\\cmd.exe /d C:\\Users\\Public\\alpha.pif /o
        3⤵
          PID:2656
        • C:\Windows\SysWOW64\esentutl.exe
          C:\\Windows\\System32\\esentutl /y C:\\Windows\\System32\\ping.exe /d C:\\Users\\Public\\xpha.pif /o
          3⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          PID:2668
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c mkdir "\\?\C:\Windows "
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2608
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c mkdir "\\?\C:\Windows \SysWOW64"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2640
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c C:\\Users\\Public\\xpha.pif 127.0.0.1 -n 10
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          PID:2732
          • C:\Users\Public\xpha.pif
            C:\\Users\\Public\\xpha.pif 127.0.0.1 -n 10
            4⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            PID:1232
        • C:\Windows \SysWOW64\per.exe
          "C:\\Windows \\SysWOW64\\per.exe
          3⤵
          • Executes dropped EXE
          PID:2420
        • C:\Windows \SysWOW64\per.exe
          "C:\Windows \SysWOW64\per.exe"
          3⤵
          • Executes dropped EXE
          PID:2304
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c del "C:\Users\Public\xpha.pif"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2856
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c rmdir "C:\Windows \SysWOW64
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2936
        • C:\Users\Public\alpha.pif
          C:\\Users\\Public\\alpha.pif /c rmdir "C:\Windows \"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2924
      • C:\Windows\SysWOW64\esentutl.exe
        C:\\Windows\\System32\\esentutl.exe /y C:\Users\Admin\AppData\Local\Temp\050736376a0870aea56e2faf90ea34aa7af231c7b2d3d209bcac91628eec77c9.exe /d C:\\Users\\Public\\Libraries\\Ntmftfld.PIF /o
        2⤵
          PID:2300
        • C:\Windows\SysWOW64\colorcpl.exe
          C:\Windows\System32\colorcpl.exe
          2⤵
          • System Location Discovery: System Language Discovery
          PID:2248

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\remcos\logs.dat

        Filesize

        146B

        MD5

        b7a6d17a0622548ad90fdd5890fce517

        SHA1

        31ab99460b72c5da591f815ad7fc6964779afbb8

        SHA256

        5b80a47ce851134db1b38c7f76eaa39b4e8a6913fc738d000776bf8a0e1418d3

        SHA512

        fa155110387febd6037f71e8e702f2a41193478af800a8a0093f4bdf990c038cbb52ac389b450a51d6ccb5bc83e22027cbd44657196734ec2ebfb3e6d64c53a6

      • C:\Users\Public\Libraries\dlftfmtN.cmd

        Filesize

        60KB

        MD5

        b87f096cbc25570329e2bb59fee57580

        SHA1

        d281d1bf37b4fb46f90973afc65eece3908532b2

        SHA256

        d08ccc9b1e3acc205fe754bad8416964e9711815e9ceed5e6af73d8e9035ec9e

        SHA512

        72901adde38f50cf6d74743c0a546c0fea8b1cd4a18449048a0758a7593a176fc33aad1ebfd955775eefc2b30532bcc18e4f2964b3731b668dd87d94405951f7

      • C:\Windows \SysWOW64\per.exe

        Filesize

        94KB

        MD5

        869640d0a3f838694ab4dfea9e2f544d

        SHA1

        bdc42b280446ba53624ff23f314aadb861566832

        SHA256

        0db4d3ffdb96d13cf3b427af8be66d985728c55ae254e4b67d287797e4c0b323

        SHA512

        6e775cfb350415434b18427d5ff79b930ed3b0b3fc3466bc195a796c95661d4696f2d662dd0e020c3a6c3419c2734468b1d7546712ecec868d2bbfd2bc2468a7

      • \Users\Public\alpha.pif

        Filesize

        295KB

        MD5

        ad7b9c14083b52bc532fba5948342b98

        SHA1

        ee8cbf12d87c4d388f09b4f69bed2e91682920b5

        SHA256

        17f746d82695fa9b35493b41859d39d786d32b23a9d2e00f4011dec7a02402ae

        SHA512

        e12aad20c824187b39edb3c7943709290b5ddbf1b4032988db46f2e86da3cf7e7783f78c82e4dc5da232f666b8f9799a260a1f8e2694eb4d0cdaf78da710fde1

      • \Users\Public\xpha.pif

        Filesize

        15KB

        MD5

        6242e3d67787ccbf4e06ad2982853144

        SHA1

        6ac7947207d999a65890ab25fe344955da35028e

        SHA256

        4ca10dba7ff487fdb3f1362a3681d7d929f5aa1262cdfd31b04c30826983fb1d

        SHA512

        7d0d457e1537d624119a8023bcc086575696a5739c0460ef11554afac13af5e5d1edc7629a10e62834aba9f1b3ab1442011b15b4c3930399d91dca34b3b1cbaf

      • memory/2248-77-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-83-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-109-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-71-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-75-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-74-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-70-0x00000000031E0000-0x00000000041E0000-memory.dmp

        Filesize

        16.0MB

      • memory/2248-108-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-82-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-102-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-101-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-88-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-90-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-95-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2248-96-0x0000000002FD0000-0x000000000304F000-memory.dmp

        Filesize

        508KB

      • memory/2716-1-0x0000000003620000-0x0000000004620000-memory.dmp

        Filesize

        16.0MB

      • memory/2716-4-0x0000000000400000-0x0000000000588000-memory.dmp

        Filesize

        1.5MB

      • memory/2716-0-0x0000000000230000-0x0000000000231000-memory.dmp

        Filesize

        4KB

      • memory/2716-2-0x0000000003620000-0x0000000004620000-memory.dmp

        Filesize

        16.0MB