Analysis

  • max time kernel
    79s
  • max time network
    81s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-02-2023 08:15

General

  • Target

    Yfnrxjtz.exe

  • Size

    40.1MB

  • MD5

    ada8e3c4cf912f0d95b90bcba4c35bf9

  • SHA1

    2c3dd9fb668c241b7155cf35afd4b570d74fc436

  • SHA256

    e9b31a5fc7aeb80fb74a0d2c1a09037a3147a971eec398b0b49340fbac7c70ae

  • SHA512

    b315989a8d5fecc0392432468e54f8e8cf11ec2878637998d379f41a4fae40d8fbeb44f4fa7c1de8d17c3f06610318621c5f4baa6c6849eea31f6bf52d26b13b

  • SSDEEP

    12288:09eu4QUqmzouRvfkK10/ngIlubJA7pXUKPpj1RgL7/Wx5QblAc6FgMHOygt:09B4cuRHLkVS8pjTDzClp6FFu/

Malware Config

Extracted

Family

remcos

Botnet

Feb-AED-2023

C2

pentester01.duckdns.org:53077

pentester0.accesscam.org:56796

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    WeTransfer.exe

  • copy_folder

    WeTransfer

  • 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

    Wetransfer

  • mouse_option

    false

  • mutex

    Wtr-T1D6TL

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    WeTransfer

  • 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.

  • Remcos

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

  • ModiLoader Second Stage 1 IoCs
  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 3 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 5 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 5 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 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 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 6 IoCs
  • Modifies registry class 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious behavior: MapViewOfSection 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 7 IoCs
  • Suspicious use of WriteProcessMemory 58 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Yfnrxjtz.exe
    "C:\Users\Admin\AppData\Local\Temp\Yfnrxjtz.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3192
    • C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
      "C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Public\mwfztjxrnfY.docx" /o ""
      2⤵
      • Checks processor information in registry
      • Enumerates system info in registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of SetWindowsHookEx
      PID:4252
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Public\Libraries\YfnrxjtzO.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3444
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /S /D /c" ECHO F"
        3⤵
          PID:2376
        • C:\Windows\SysWOW64\xcopy.exe
          xcopy "easinvoker.exe" "C:\Windows \System32\" /K /D /H /Y
          3⤵
          • Enumerates system info in registry
          PID:1588
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /S /D /c" ECHO F"
          3⤵
            PID:1768
          • C:\Windows\SysWOW64\xcopy.exe
            xcopy "netutils.dll" "C:\Windows \System32\" /K /D /H /Y
            3⤵
            • Enumerates system info in registry
            PID:1776
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /S /D /c" ECHO F"
            3⤵
              PID:640
            • C:\Windows\SysWOW64\xcopy.exe
              xcopy "KDECO.bat" "C:\Windows \System32\" /K /D /H /Y
              3⤵
              • Enumerates system info in registry
              PID:4208
            • C:\Windows \System32\easinvoker.exe
              "C:\Windows \System32\easinvoker.exe"
              3⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:4776
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\windows \system32\KDECO.bat""
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:4040
                • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                  powershell -WindowStyle Hidden -inputformat none -outputformat none -NonInteractive -Command "Add-MpPreference -ExclusionPath 'C:\Users'"
                  5⤵
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:4596
            • C:\Windows\SysWOW64\PING.EXE
              ping 127.0.0.1 -n 6
              3⤵
              • Runs ping.exe
              PID:4452
          • C:\Users\Public\Libraries\ztjxrnfY.pif
            C:\Users\Public\Libraries\ztjxrnfY.pif
            2⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious behavior: MapViewOfSection
            • Suspicious use of WriteProcessMemory
            PID:380
            • C:\Users\Public\Libraries\ztjxrnfY.pif
              C:\Users\Public\Libraries\ztjxrnfY.pif /stext "C:\Users\Admin\AppData\Local\Temp\fyglwmhnsh"
              3⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              PID:4816
            • C:\Users\Public\Libraries\ztjxrnfY.pif
              C:\Users\Public\Libraries\ztjxrnfY.pif /stext "C:\Users\Admin\AppData\Local\Temp\psleweapgpkjx"
              3⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook accounts
              PID:4492
            • C:\Users\Public\Libraries\ztjxrnfY.pif
              C:\Users\Public\Libraries\ztjxrnfY.pif /stext "C:\Users\Admin\AppData\Local\Temp\zvqwpxljuxcwhyjy"
              3⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2328

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Registry Run Keys / Startup Folder

        1
        T1060

        Defense Evasion

        Modify Registry

        1
        T1112

        Credential Access

        Credentials in Files

        1
        T1081

        Discovery

        Query Registry

        3
        T1012

        System Information Discovery

        4
        T1082

        Remote System Discovery

        1
        T1018

        Collection

        Data from Local System

        1
        T1005

        Email Collection

        1
        T1114

        Command and Control

        Web Service

        1
        T1102

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\fyglwmhnsh
          Filesize

          4KB

          MD5

          d06ebab8b0513f602e535079a9ebbeea

          SHA1

          d29472e6eb5a72f0353d70b97a33337b255b487e

          SHA256

          0c9e16830ccc6495def187adde2137ac07a566e1534e5714f626dcd68d28094c

          SHA512

          002df6f401950fd24d5976a47c58e9e2c58cef7d4fdec69f815fb6a00fb1e1a8963a4a7bf52056e61d6f6875edec393c466742c3031dd5f88802b45ddadca209

        • C:\Users\Public\Libraries\KDECO.bat
          Filesize

          155B

          MD5

          213c60adf1c9ef88dc3c9b2d579959d2

          SHA1

          e4d2ad7b22b1a8b5b1f7a702b303c7364b0ee021

          SHA256

          37c59c8398279916cfce45f8c5e3431058248f5e3bef4d9f5c0f44a7d564f82e

          SHA512

          fe897d9caa306b0e761b2fd61bb5dc32a53bfaad1ce767c6860af4e3ad59c8f3257228a6e1072dab0f990cb51c59c648084ba419ac6bc5c0a99bdffa569217b7

        • C:\Users\Public\Libraries\YfnrxjtzO.bat
          Filesize

          411B

          MD5

          55aba243e88f6a6813c117ffe1fa5979

          SHA1

          210b9b028a4b798c837a182321dbf2e50d112816

          SHA256

          5a11c5641c476891aa30e7ecfa57c2639f6827d8640061f73e9afec0adbbd7d2

          SHA512

          68009c4c9bbea75a3bfa9f79945d30957a95691ea405d031b4ca7f1cb47504bbc768fcae59173885743ad4d6cfdd2313c3fe0acb515e34e5c809ecdc7f45e307

        • C:\Users\Public\Libraries\easinvoker.exe
          Filesize

          128KB

          MD5

          231ce1e1d7d98b44371ffff407d68b59

          SHA1

          25510d0f6353dbf0c9f72fc880de7585e34b28ff

          SHA256

          30951db8bfc21640645aa9144cfeaa294bb7c6980ef236d28552b6f4f3f92a96

          SHA512

          520887b01bda96b7c4f91b9330a5c03a12f7c7f266d4359432e7bacc76b0eef377c05a4361f8fa80ad0b94b5865699d747a5d94a2d3dcdb85dabf5887bb6c612

        • C:\Users\Public\Libraries\netutils.dll
          Filesize

          110KB

          MD5

          b375e74a145c45d07190212e9157e5f8

          SHA1

          59d3de7748e1090ce95523601224ce5ab6cc4a3a

          SHA256

          6ec341496722bfdde504d430a7ece494701a9369b1fa5376ec488a77ab3c1744

          SHA512

          859737afb6108f131c0ac35560878359505c4f7fdd01ce468c04b15848df71f70987552a831a43ce948a37c9b1d6a434ff7f6fb5946f3730049b924d5b462ef0

        • C:\Users\Public\Libraries\ztjxrnfY.pif
          Filesize

          66KB

          MD5

          c116d3604ceafe7057d77ff27552c215

          SHA1

          452b14432fb5758b46f2897aeccd89f7c82a727d

          SHA256

          7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

          SHA512

          9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

        • C:\Users\Public\Libraries\ztjxrnfY.pif
          Filesize

          66KB

          MD5

          c116d3604ceafe7057d77ff27552c215

          SHA1

          452b14432fb5758b46f2897aeccd89f7c82a727d

          SHA256

          7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

          SHA512

          9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

        • C:\Users\Public\Libraries\ztjxrnfY.pif
          Filesize

          66KB

          MD5

          c116d3604ceafe7057d77ff27552c215

          SHA1

          452b14432fb5758b46f2897aeccd89f7c82a727d

          SHA256

          7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

          SHA512

          9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

        • C:\Users\Public\Libraries\ztjxrnfY.pif
          Filesize

          66KB

          MD5

          c116d3604ceafe7057d77ff27552c215

          SHA1

          452b14432fb5758b46f2897aeccd89f7c82a727d

          SHA256

          7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

          SHA512

          9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

        • C:\Users\Public\Libraries\ztjxrnfY.pif
          Filesize

          66KB

          MD5

          c116d3604ceafe7057d77ff27552c215

          SHA1

          452b14432fb5758b46f2897aeccd89f7c82a727d

          SHA256

          7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

          SHA512

          9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

        • C:\Users\Public\mwfztjxrnfY.docx
          Filesize

          11KB

          MD5

          afcdfbf26d955c1744deb027b9ac779a

          SHA1

          762134703e1bdc080bef4a3403458e96222ce2e9

          SHA256

          97dd5df916f0abb3df966133b95cc3d4891de3bb0c2e4c002f83d571a05e6a3d

          SHA512

          5ae36b60bcef5fd9f32738340a2e8b60edf924781ad68d7ae1654413cb0f4c6d0ecf876b93b3e3ccec3cbbfe387533880511ff2c1a3482fe716dac6d007476a2

        • C:\Windows \System32\easinvoker.exe
          Filesize

          128KB

          MD5

          231ce1e1d7d98b44371ffff407d68b59

          SHA1

          25510d0f6353dbf0c9f72fc880de7585e34b28ff

          SHA256

          30951db8bfc21640645aa9144cfeaa294bb7c6980ef236d28552b6f4f3f92a96

          SHA512

          520887b01bda96b7c4f91b9330a5c03a12f7c7f266d4359432e7bacc76b0eef377c05a4361f8fa80ad0b94b5865699d747a5d94a2d3dcdb85dabf5887bb6c612

        • C:\Windows \System32\easinvoker.exe
          Filesize

          128KB

          MD5

          231ce1e1d7d98b44371ffff407d68b59

          SHA1

          25510d0f6353dbf0c9f72fc880de7585e34b28ff

          SHA256

          30951db8bfc21640645aa9144cfeaa294bb7c6980ef236d28552b6f4f3f92a96

          SHA512

          520887b01bda96b7c4f91b9330a5c03a12f7c7f266d4359432e7bacc76b0eef377c05a4361f8fa80ad0b94b5865699d747a5d94a2d3dcdb85dabf5887bb6c612

        • C:\Windows \System32\netutils.dll
          Filesize

          110KB

          MD5

          b375e74a145c45d07190212e9157e5f8

          SHA1

          59d3de7748e1090ce95523601224ce5ab6cc4a3a

          SHA256

          6ec341496722bfdde504d430a7ece494701a9369b1fa5376ec488a77ab3c1744

          SHA512

          859737afb6108f131c0ac35560878359505c4f7fdd01ce468c04b15848df71f70987552a831a43ce948a37c9b1d6a434ff7f6fb5946f3730049b924d5b462ef0

        • C:\Windows \System32\netutils.dll
          Filesize

          110KB

          MD5

          b375e74a145c45d07190212e9157e5f8

          SHA1

          59d3de7748e1090ce95523601224ce5ab6cc4a3a

          SHA256

          6ec341496722bfdde504d430a7ece494701a9369b1fa5376ec488a77ab3c1744

          SHA512

          859737afb6108f131c0ac35560878359505c4f7fdd01ce468c04b15848df71f70987552a831a43ce948a37c9b1d6a434ff7f6fb5946f3730049b924d5b462ef0

        • C:\windows \system32\KDECO.bat
          Filesize

          155B

          MD5

          213c60adf1c9ef88dc3c9b2d579959d2

          SHA1

          e4d2ad7b22b1a8b5b1f7a702b303c7364b0ee021

          SHA256

          37c59c8398279916cfce45f8c5e3431058248f5e3bef4d9f5c0f44a7d564f82e

          SHA512

          fe897d9caa306b0e761b2fd61bb5dc32a53bfaad1ce767c6860af4e3ad59c8f3257228a6e1072dab0f990cb51c59c648084ba419ac6bc5c0a99bdffa569217b7

        • memory/380-185-0x0000000010000000-0x0000000010019000-memory.dmp
          Filesize

          100KB

        • memory/380-188-0x0000000010000000-0x0000000010019000-memory.dmp
          Filesize

          100KB

        • memory/380-189-0x0000000010000000-0x0000000010019000-memory.dmp
          Filesize

          100KB

        • memory/380-172-0x00000000006E0000-0x000000000075C000-memory.dmp
          Filesize

          496KB

        • memory/380-171-0x0000000010590000-0x000000001060F000-memory.dmp
          Filesize

          508KB

        • memory/380-190-0x00000000006E0000-0x000000000075C000-memory.dmp
          Filesize

          496KB

        • memory/380-192-0x0000000010000000-0x0000000010019000-memory.dmp
          Filesize

          100KB

        • memory/380-167-0x0000000000000000-mapping.dmp
        • memory/640-143-0x0000000000000000-mapping.dmp
        • memory/1588-138-0x0000000000000000-mapping.dmp
        • memory/1768-140-0x0000000000000000-mapping.dmp
        • memory/1776-141-0x0000000000000000-mapping.dmp
        • memory/2328-177-0x0000000000000000-mapping.dmp
        • memory/2328-181-0x0000000000400000-0x0000000000424000-memory.dmp
          Filesize

          144KB

        • memory/2376-137-0x0000000000000000-mapping.dmp
        • memory/3192-170-0x0000000010590000-0x000000001060F000-memory.dmp
          Filesize

          508KB

        • memory/3192-166-0x0000000010590000-0x000000001060F000-memory.dmp
          Filesize

          508KB

        • memory/3192-132-0x00000000023E0000-0x000000000240C000-memory.dmp
          Filesize

          176KB

        • memory/3444-135-0x0000000000000000-mapping.dmp
        • memory/4040-151-0x0000000000000000-mapping.dmp
        • memory/4208-144-0x0000000000000000-mapping.dmp
        • memory/4252-194-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-195-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-197-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-196-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-163-0x00007FFBA4B80000-0x00007FFBA4B90000-memory.dmp
          Filesize

          64KB

        • memory/4252-134-0x0000000000000000-mapping.dmp
        • memory/4252-157-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-158-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-156-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-164-0x00007FFBA4B80000-0x00007FFBA4B90000-memory.dmp
          Filesize

          64KB

        • memory/4252-159-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4252-160-0x00007FFBA7350000-0x00007FFBA7360000-memory.dmp
          Filesize

          64KB

        • memory/4452-153-0x0000000000000000-mapping.dmp
        • memory/4492-180-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/4492-175-0x0000000000000000-mapping.dmp
        • memory/4492-191-0x0000000000400000-0x0000000000457000-memory.dmp
          Filesize

          348KB

        • memory/4596-154-0x0000000000000000-mapping.dmp
        • memory/4596-162-0x00007FFBC8900000-0x00007FFBC93C1000-memory.dmp
          Filesize

          10.8MB

        • memory/4596-161-0x00007FFBC8900000-0x00007FFBC93C1000-memory.dmp
          Filesize

          10.8MB

        • memory/4596-155-0x000002501C930000-0x000002501C952000-memory.dmp
          Filesize

          136KB

        • memory/4776-146-0x0000000000000000-mapping.dmp
        • memory/4816-183-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/4816-179-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/4816-182-0x0000000000400000-0x0000000000478000-memory.dmp
          Filesize

          480KB

        • memory/4816-173-0x0000000000000000-mapping.dmp