Analysis

  • max time kernel
    22s
  • max time network
    147s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250410-en
  • resource tags

    arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    17/04/2025, 02:49

General

  • Target

    Kubba.exe

  • Size

    676KB

  • MD5

    332aa2564ed356587d489977705fb53a

  • SHA1

    333847db1556bd2845e616cdbcda32452204e817

  • SHA256

    6d73791cb1c08f5c2c98760bee7cc2fce021b022e2e420ad2e18588daf37c045

  • SHA512

    92b47205a445f0af0505fcfc23cbd0cc2a8bb769969ea8975cac054940a63a5a8674ed4fe82e5527b92347db0ff9c4e384a77d053792dc9954f00723237516c5

  • SSDEEP

    12288:0Y/WcAdxdOYu0IDH4DUAemK9n4ycm5hMFHeG5r5ICyx27ZTJ2lp5siBeFsk:0Y/WcGxdO+IDhAerd7+r5xAwRJ2lpTqZ

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

196.251.115.182:2404

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • 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

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-J42W19

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Guloader family
  • Guloader,Cloudeye

    A shellcode based downloader first seen in 2020.

  • Remcos

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

  • Remcos family
  • Detected Nirsoft tools 4 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 2 IoCs

    Password recovery tool for various web browsers

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 4 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs
  • Drops file in System32 directory 4 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Kubba.exe
    "C:\Users\Admin\AppData\Local\Temp\Kubba.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in System32 directory
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:4680
    • C:\Users\Admin\AppData\Local\Temp\Kubba.exe
      "C:\Users\Admin\AppData\Local\Temp\Kubba.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4576
      • C:\ProgramData\Remcos\remcos.exe
        "C:\ProgramData\Remcos\remcos.exe"
        3⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • System Location Discovery: System Language Discovery
        PID:2428
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1164
    • C:\ProgramData\Remcos\remcos.exe
      C:\ProgramData\Remcos\remcos.exe
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      PID:5448
  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3088
    • C:\ProgramData\Remcos\remcos.exe
      C:\ProgramData\Remcos\remcos.exe
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in System32 directory
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      PID:5708
      • C:\ProgramData\Remcos\remcos.exe
        C:\ProgramData\Remcos\remcos.exe
        3⤵
          PID:3220
          • C:\Windows\SysWOW64\recover.exe
            C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\bpecfkqf"
            4⤵
              PID:4528
            • C:\Windows\SysWOW64\recover.exe
              C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\erjugdbzwjk"
              4⤵
                PID:1980
              • C:\Windows\SysWOW64\recover.exe
                C:\Windows\SysWOW64\recover.exe /stext "C:\Users\Admin\AppData\Local\Temp\olpfhvmajrcpqxu"
                4⤵
                  PID:1220
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
            1⤵
              PID:5028
              • C:\ProgramData\Remcos\remcos.exe
                C:\ProgramData\Remcos\remcos.exe
                2⤵
                  PID:440
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c "C:\ProgramData\Remcos\remcos.exe"
                1⤵
                  PID:3320
                  • C:\ProgramData\Remcos\remcos.exe
                    C:\ProgramData\Remcos\remcos.exe
                    2⤵
                      PID:3976
                      • C:\ProgramData\Remcos\remcos.exe
                        C:\ProgramData\Remcos\remcos.exe
                        3⤵
                          PID:5872

                    Network

                    MITRE ATT&CK Enterprise v16

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    • C:\ProgramData\Remcos\remcos.exe

                      Filesize

                      676KB

                      MD5

                      332aa2564ed356587d489977705fb53a

                      SHA1

                      333847db1556bd2845e616cdbcda32452204e817

                      SHA256

                      6d73791cb1c08f5c2c98760bee7cc2fce021b022e2e420ad2e18588daf37c045

                      SHA512

                      92b47205a445f0af0505fcfc23cbd0cc2a8bb769969ea8975cac054940a63a5a8674ed4fe82e5527b92347db0ff9c4e384a77d053792dc9954f00723237516c5

                    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

                      Filesize

                      1KB

                      MD5

                      517b42c897481d3ef87c7d3590dc4556

                      SHA1

                      52db14d62d6e762bf4ee6458d4e562abffe66dd1

                      SHA256

                      8b03de3b33087141fa82c1e1cd7e6c704a47d755316c62cbaa63b5eb84192af5

                      SHA512

                      86c0d25d1825b6dbf3b415ec3e5ce87a55177bf9c9e6ff176dd98b8a44fe9082ae457d2b8c01c4f24c0e1e530c99307bce3c5600f1d1c9964e24551d99175b11

                    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B3513D73A177A2707D910183759B389B_D1B2C3FDC4CC18AB2F25B2BB5E2D4A02

                      Filesize

                      471B

                      MD5

                      1d4632adbc075ecbc910f1dc1ea7aab7

                      SHA1

                      aefef0d5a36d2ccbb0269d89acd7607c185563b9

                      SHA256

                      da21852c5ec264fdf502462af387cc11b877e6df1a9cf6aa11634f084bde188f

                      SHA512

                      e024a6cc7f80cf0b70479bb3d98593f7b2ee07ecf37eaa892a828f889614cdce3a6a3cb203a02d7150b593f2f48e9bf1e80635b07f2fe6d2a7f5685f6b9fe34b

                    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

                      Filesize

                      410B

                      MD5

                      0961b58804bb9d5cf5749c059d1da383

                      SHA1

                      5d910bd9c58d09be3710ec02ea7b337991d13d1d

                      SHA256

                      6240310af6f045ace5f91dbf2c363f2fdbbcb0aae1154d305a97f4da124d3824

                      SHA512

                      6b786a3afc7415db215b694ff05a97689f7360a4cf97f97d43aa6e919d387f721c1c42f4740b21f0050131f8d30509a3654ebaf6c0bdd4d7aaf8df515c90203e

                    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B3513D73A177A2707D910183759B389B_D1B2C3FDC4CC18AB2F25B2BB5E2D4A02

                      Filesize

                      402B

                      MD5

                      dd35865ddf6b7c7d5f1c30a16c95a984

                      SHA1

                      6441a64ddc3927d0b94ef6d29b85c4b0a84e5805

                      SHA256

                      8db40e473e1ee5e01f9cb6f8f380840b5ecbcb949fee379c93342191f952d75a

                      SHA512

                      f40261fe5919d4743cceaf6a897a299ded4ea841aaf645773963161506f3ba7bef7da886f85c869d708807cc948a7d1e7a2d1f53e2542e6761c458e0db99aae3

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

                      Filesize

                      2B

                      MD5

                      f3b25701fe362ec84616a93a45ce9998

                      SHA1

                      d62636d8caec13f04e28442a0a6fa1afeb024bbb

                      SHA256

                      b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

                      SHA512

                      98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

                    • C:\Users\Admin\AppData\Local\Temp\nsoDC58.tmp\System.dll

                      Filesize

                      12KB

                      MD5

                      cff85c549d536f651d4fb8387f1976f2

                      SHA1

                      d41ce3a5ff609df9cf5c7e207d3b59bf8a48530e

                      SHA256

                      8dc562cda7217a3a52db898243de3e2ed68b80e62ddcb8619545ed0b4e7f65a8

                      SHA512

                      531d6328daf3b86d85556016d299798fa06fefc81604185108a342d000e203094c8c12226a12bd6e1f89b0db501fb66f827b610d460b933bd4ab936ac2fd8a88

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Bagwash.Vas

                      Filesize

                      342KB

                      MD5

                      54eeb211f2c4c70869673e021074ee0e

                      SHA1

                      4287659180864df64e2a79c5af9024ef1545c9ba

                      SHA256

                      edbd395f51ebbd89112dfdd14e1d69010e28d0e82fcf12b9df1633c2d7850c46

                      SHA512

                      2584ba6ba63ff831ba2cc11da771df77fc4e254287561c184af83bd02b858f6a7d625da2664619984f2f5b785e25af037d06521d484f3a23b51c3a7acc5c27a8

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Lamper.jpg

                      Filesize

                      97KB

                      MD5

                      76aa50f1e0bcb4ed44e0da686fb1115a

                      SHA1

                      c2083f4218ab03cb5dd7e1fa12cc5b026a2b63fb

                      SHA256

                      d7e7113a11841604012fdcb8037ca28de5161a3b9ccffcb8440fba1847e128d8

                      SHA512

                      9e295d7881d9e7341f1082221bb5f5ebeee0fa9cb02c6c5ae58194037be23611e5e3a910101afa7509467445a430f459fb3c54016e2874df45781882a0498be4

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\Nonvitreous.Ens

                      Filesize

                      51KB

                      MD5

                      954e674acf3dd9eb2071954b08f6cdca

                      SHA1

                      46a6cc706e97f17eb7f20114def5d7f5a4a7692a

                      SHA256

                      66da0f0edf2b1b158729486c7c5ca48cce7490c36ffdd4d794da528d8f033f85

                      SHA512

                      b95a07d56fa9948622407391179bae4ac5af9101a34fb914208535a27f236b5c14b581800f063841bd13c3483ccda6826715260774d4c4da18a6091c434a787c

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\blev.sic

                      Filesize

                      321KB

                      MD5

                      2bd23a1fe1db40048da512bea4500417

                      SHA1

                      983f7443e7c4c8a37cc92b06b9aefee6e6bf57b9

                      SHA256

                      f90b84e5e4fad7afcec2a9f9d29fbacde444ff121f6b1801c2dce6748fb05068

                      SHA512

                      e0ce68c81576f52643b59ac448b949617810a62f9b093073304a443d879ab671b006a58c0e50b29197bf053c4d8c01670a3b9efe0d564dd9dd85e160bd281509

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\colleens.txt

                      Filesize

                      370B

                      MD5

                      313a9633a58de00315d4b8a88456dbd4

                      SHA1

                      ac8642ba8fc5ad947be76992b388ba90c1f4f29d

                      SHA256

                      cab61979083d60310c85253bc87b5047a40869b56f1d78885f45556a809f47e8

                      SHA512

                      c274194f91eff6525d039f602bce9294ebfd805ee1382946a3f89fdf6e6c7e315ff50462c54c51a80da97de66c75e2b450d626b28ac31f391c85f9a6de1f87d1

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\fagkyndige.ini

                      Filesize

                      39B

                      MD5

                      cfc5144c3a75d5f817151ecf6e59b0f3

                      SHA1

                      324399c734ad798dd6f1eead4534f6f9e6bbdd21

                      SHA256

                      e8ec675329b6f0e7223548d4dae4fe8787e077ea654913ab4509d927ad5e0bba

                      SHA512

                      1e91beba4352d45e4a784956c4b2c7cd19f3cc38bece8aa1f0729e4a4b6f334d8b55ff1083bf42c942b7c755740adae4e316654828c4c004bc838671505b2adb

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\myocardium.set

                      Filesize

                      394KB

                      MD5

                      e394eba898e6c64de87228a8e2f86480

                      SHA1

                      56d3342568f90282edcb24da3d79559316d1f181

                      SHA256

                      f2eaac6d269bf7ba5e033a525359ea1865dcb4008f8d320fa1883e90705b74f2

                      SHA512

                      bd99eaf068ac0309ddf6ebfe7862dcd33b5fbb4cb350a7f18791d984600e70978e00348a32e0e8157e8a145eb50c18dd9617684ae3f009932eacdc67ba115413

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\myocardium.set

                      Filesize

                      128KB

                      MD5

                      936d66491f2ce399ed7e05c25f99aa42

                      SHA1

                      cdf308c12744648b05a25f521b062a8a4189edd5

                      SHA256

                      dc4f8119951815c8003228a91dbe919e51864932ce81726f1a151e8a02edc3b0

                      SHA512

                      f74d3bd919f5e537ea78f90270de3ee9e9027d478e51aed7549950c240215b77cce42c9d5bfb0ea2000fae51d2843c4bea90a1909dd67b92f3a943a0ec67ccb4

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\noncontestable.sys

                      Filesize

                      356KB

                      MD5

                      1c0e5e3fad38ad4c071145b0c91b1c75

                      SHA1

                      d4332d34c719454b251de7fea2f7ebf74e9ce59f

                      SHA256

                      c9d19087bf0a5cce7b23a791be76d2ed701b7dce69f86baefaa99e7a19fb1567

                      SHA512

                      9b71e0ac39de87e365d87df4052922d545f90e9b899b962459b9f9e5598a19a36ce247e03cc916d76feef53c5a54a6ae7bb8694e08cfa28822a522f2782a6689

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\opkast.jpg

                      Filesize

                      8KB

                      MD5

                      a798defe4bd96ce304a2b64ba9db9451

                      SHA1

                      ebe61d1bb9f882db6779e125239c94e24fa31ac8

                      SHA256

                      4c4e725a9de497a0171cb912ae1039cf782bdda0791bc15e6960c643f36282b7

                      SHA512

                      6e5b183e0fd717c7f56318f6cb8b2e273c5541d1c0205cb9af317d66a062613c9d5e08d601ed8164c6bb785349482f2406db34254bc886898a165b3608aebd69

                    • C:\Users\Admin\hjemmefronter\Synthetase54\Xylophagan\wineshop.ini

                      Filesize

                      616B

                      MD5

                      059cb6042549f01a636176876a196d29

                      SHA1

                      434624b61da12f82cd9dd001cf89071e289d6692

                      SHA256

                      c937269a7ddc6b76b73dd9cbd9e64b318665f2c622b00a7ab6e8d0cc31583c2c

                      SHA512

                      6fdd35b9bd2494f7a4831779cf5e55aa7620cc41c08915aca25279dc071f2016e6960c9c50a4d709a64a7b2d01234b11144e82159ad8a671535cade0c66ee208

                    • memory/1220-173-0x0000000000400000-0x0000000000424000-memory.dmp

                      Filesize

                      144KB

                    • memory/1220-175-0x0000000000400000-0x0000000000424000-memory.dmp

                      Filesize

                      144KB

                    • memory/1220-176-0x0000000000400000-0x0000000000424000-memory.dmp

                      Filesize

                      144KB

                    • memory/1980-177-0x0000000000400000-0x0000000000462000-memory.dmp

                      Filesize

                      392KB

                    • memory/1980-162-0x0000000000400000-0x0000000000462000-memory.dmp

                      Filesize

                      392KB

                    • memory/1980-163-0x0000000000400000-0x0000000000462000-memory.dmp

                      Filesize

                      392KB

                    • memory/3220-182-0x0000000033F90000-0x0000000033FA9000-memory.dmp

                      Filesize

                      100KB

                    • memory/3220-187-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-118-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-202-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-198-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-197-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-196-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-123-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-127-0x0000000001780000-0x0000000002D08000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/3220-195-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-188-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-116-0x0000000001780000-0x0000000002D08000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/3220-184-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/3220-179-0x0000000033F90000-0x0000000033FA9000-memory.dmp

                      Filesize

                      100KB

                    • memory/3220-183-0x0000000033F90000-0x0000000033FA9000-memory.dmp

                      Filesize

                      100KB

                    • memory/4528-161-0x0000000000400000-0x000000000047D000-memory.dmp

                      Filesize

                      500KB

                    • memory/4528-159-0x0000000000400000-0x000000000047D000-memory.dmp

                      Filesize

                      500KB

                    • memory/4576-76-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/4576-77-0x00007FFFA1D80000-0x00007FFFA1F89000-memory.dmp

                      Filesize

                      2.0MB

                    • memory/4576-33-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/4576-39-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/4576-32-0x00007FFFA1D80000-0x00007FFFA1F89000-memory.dmp

                      Filesize

                      2.0MB

                    • memory/4576-22-0x00007FFFA1D80000-0x00007FFFA1F89000-memory.dmp

                      Filesize

                      2.0MB

                    • memory/4576-37-0x0000000001780000-0x0000000002D08000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/4680-18-0x00007FFFA1D81000-0x00007FFFA1EAA000-memory.dmp

                      Filesize

                      1.2MB

                    • memory/4680-17-0x0000000003430000-0x00000000049B8000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/4680-19-0x00007FFFA1D80000-0x00007FFFA1F89000-memory.dmp

                      Filesize

                      2.0MB

                    • memory/4680-20-0x0000000003430000-0x00000000049B8000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/4680-23-0x0000000003430000-0x00000000049B8000-memory.dmp

                      Filesize

                      21.5MB

                    • memory/5872-194-0x0000000000460000-0x0000000001777000-memory.dmp

                      Filesize

                      19.1MB

                    • memory/5872-193-0x0000000001780000-0x0000000002D08000-memory.dmp

                      Filesize

                      21.5MB