Resubmissions

10-04-2024 02:41

240410-c6hmmsfd7z 10

10-04-2024 02:41

240410-c6g14scb46 10

10-04-2024 02:41

240410-c6gqcacb45 10

10-04-2024 02:41

240410-c6f4tacb44 10

14-10-2023 01:33

231014-bysbfahh6s 10

Analysis

  • max time kernel
    1558s
  • max time network
    1558s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:41

General

  • Target

    x19a4f9f3d16fcc9779ba8ea79bf7.exe

  • Size

    392KB

  • MD5

    2299a17350433284e58bd0fcc10edf41

  • SHA1

    d477f1cd55365db00ca77cc5459afabe1ffc80b3

  • SHA256

    c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d

  • SHA512

    123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1

  • SSDEEP

    6144:5cJGLvLE5hu6Me646G0D1ecme1x9b31v4n:uUvLr6k9b5ecmed1v4

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 6 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe
    "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2320
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2480
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2728
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2160
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2668
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2696
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2696 -s 2628
            4⤵
              PID:1196
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {0A9798C1-13B7-4964-8FCF-E35CB88D0AD5} S-1-5-21-3452737119-3959686427-228443150-1000:QGTQZTRE\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2612
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:688
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 688 -s 3300
            3⤵
              PID:2116

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          ba24c1f7c40f6527483acf74fa6faf79

          SHA1

          b15be1cf3bd01acdec6595028c35327592c9f65e

          SHA256

          dbd9b34e03637d46381e9a4e16b1750641b4c6d4085027cc2c926fcd5e7db4bc

          SHA512

          989dc3a02585331dc4490ec21260ad89f5f3296256aaa45aa50826502cecf8365df376ed7146344dfb7ce1a538606846789c602d0edffcffb25d074329c48d8c

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          0ae26f5c81d9e2fad88f75ce395174c9

          SHA1

          8fff7ef926f4478e69f55cdf50dacc73ef9e8679

          SHA256

          71a592aded55b10d982f2f5e5fc7dcc2a7d43119806a24860c72eec1910c49f3

          SHA512

          742a2c30482b486b1050c60c4301029eea29df99f11016f3abed7b3f12442c7c3e74ac70abd6313a658badea1d807dc59b8779b625e291158af9bf9dab85e255

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          244178f33c4f4b794e90e08ee5455f92

          SHA1

          77af143d16e5d3f5893217c6aae7ff038bf38918

          SHA256

          67914d2c1b260c2eab18879280513e9d0c56032ff29ba3f8abd4f7b66b05fb1f

          SHA512

          bae431c0d320d4b4e43b91a8939d49fa2d67b350e9ea38141ccf66802c8e2e889878f4714646ea37fcd5e7d74205f3d110eaf903ebf6b037aaa6f485cb11591d

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          8ca9f12b07625f601a95e520c911667b

          SHA1

          3349d11730f084a7e664156212bb24394bd69c22

          SHA256

          607e9f9075e30d2adea6f05b0dcc7ef90fdf2b95041afad2211b7d43e527bb3d

          SHA512

          4a4c56a6f4615c2c00eff0ce9cea1dba21dcc1ed4a23609aa875932d0db385a249a9db323876734b51f3a83448033aaee331379edabc55c43b8e683fb3d902ee

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          9b0e614e2051170672dd10bdc2146620

          SHA1

          bdc029c05fe771c7e7e27e0ac756e79f4c3ae4c7

          SHA256

          7c81f050ddaf1d191cd8b362fde6e0ff25f7f881e96c2c95bbcdfccba012e69f

          SHA512

          20e900a51075d50535a4eb28808924b060f9e2a639e21bc66b6280e1106c9505f9855a544f748cb29cf168d69a935071d1785acc85077db00e5a0fa643252c5f

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          2fffeefc83710e4749b67efbd2a1a592

          SHA1

          e112b2842f8bba3e4e4617ec6157afdca8fd6634

          SHA256

          be1e4174322c3af1a21953a43e3dce8ea51b3c2b64761e2edbdf3a2f0f633888

          SHA512

          128e3391b99ad243edaf285aa99e104dcd5122107b21168256171f4f2ff5c2d593b7f16634c9850b2e26f27f45ac07361ead423a2da28566d4f2da1a5ea35f90

        • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

          Filesize

          344B

          MD5

          93a856381e02f89484eb0a6c7bb62c32

          SHA1

          593c60c5b0f3703c290d567a739a68fcbcbafff9

          SHA256

          1a9d04d6d2734f73958d29c06b9b1049b349fa901c8b5d332e6849b1fd0e90b9

          SHA512

          4a6f2642409c44aa47a7bcd809889bc91f2d19bc97e65418c23ed2e4f6bad850563c71a5b7c19d713c3bdc751442c26f6656ab519b41a45c693b3671ffae7204

        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe

          Filesize

          392KB

          MD5

          2299a17350433284e58bd0fcc10edf41

          SHA1

          d477f1cd55365db00ca77cc5459afabe1ffc80b3

          SHA256

          c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d

          SHA512

          123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1

        • C:\Users\Admin\AppData\Local\Temp\Cab3D5F.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab3E45.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar3D74.tmp

          Filesize

          171KB

          MD5

          9c0c641c06238516f27941aa1166d427

          SHA1

          64cd549fb8cf014fcd9312aa7a5b023847b6c977

          SHA256

          4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

          SHA512

          936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

        • C:\Users\Admin\AppData\Local\Temp\Tar3E5A.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\xtioxntk7k\port.dat

          Filesize

          4B

          MD5

          cf9819df265db90772d487d5b2cd3cf4

          SHA1

          f820d714b8c9ca9ca87c619f352da369535c1ce3

          SHA256

          0a1954a487177cc717104d967eb5962ee5c14970ef7f06a9e24b0363cdc6a334

          SHA512

          0abd2ac0bfb3c1c52b1c969fc5b66f810b7cb185ed1c98dc76f4962e38d33e3c0f76b6cce43d4671cf0ef349f6c5bc3aadd93bb0347ac8d7031600bf85f285b6

        • memory/688-517-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

          Filesize

          9.9MB

        • memory/688-518-0x000000001B2F0000-0x000000001B370000-memory.dmp

          Filesize

          512KB

        • memory/688-450-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

          Filesize

          9.9MB

        • memory/688-451-0x000000001B2F0000-0x000000001B370000-memory.dmp

          Filesize

          512KB

        • memory/2320-0-0x00000000000C0000-0x0000000000128000-memory.dmp

          Filesize

          416KB

        • memory/2320-5-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

          Filesize

          9.9MB

        • memory/2320-2-0x0000000000480000-0x0000000000500000-memory.dmp

          Filesize

          512KB

        • memory/2320-1-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

          Filesize

          9.9MB

        • memory/2696-11-0x00000000021A0000-0x0000000002220000-memory.dmp

          Filesize

          512KB

        • memory/2696-448-0x00000000021A0000-0x0000000002220000-memory.dmp

          Filesize

          512KB

        • memory/2696-447-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

          Filesize

          9.9MB

        • memory/2696-9-0x00000000000A0000-0x0000000000108000-memory.dmp

          Filesize

          416KB

        • memory/2696-10-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

          Filesize

          9.9MB