Resubmissions

10-04-2024 02:49

240410-da1n1sfe7v 10

10-04-2024 02:49

240410-daz3gscc34 10

10-04-2024 02:48

240410-dazfyscc32 10

10-04-2024 02:48

240410-dayvesfe7s 10

14-10-2023 03:45

231014-ea62gage69 10

Analysis

  • max time kernel
    357s
  • max time network
    518s
  • platform
    windows7_x64
  • resource
    win7-20240215-en
  • resource tags

    arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:48

General

  • Target

    B9a5797cb584014f3fede.exe

  • Size

    530KB

  • MD5

    862e7aeb18ba5892f51b5712a213a614

  • SHA1

    99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

  • SHA256

    44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

  • SHA512

    678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

  • SSDEEP

    6144:XHClm6SWPoK5Z0EwVSmRPQd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHd8JyO:XHCnZxb88RatpvnzZjDv7oj19yTNTY

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582

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 1 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\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2204
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2052
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2124
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2596
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2608
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2556
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2556 -s 2376
            4⤵
              PID:2596
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {E9073ACC-163E-4C5E-9FD1-7FF548CB4C3A} S-1-5-21-2248906074-2862704502-246302768-1000:GHPZRGFC\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2756
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:2808
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2808 -s 1916
            3⤵
              PID:2536

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          344B

          MD5

          76c67c6d64d345000ecabfc16ba75732

          SHA1

          a1e791034d68783d013ead4ba5c54837aa68398d

          SHA256

          3fea551a5546a8385c8c3db021cf466cf490789d8290bd362b371ca002ca1cae

          SHA512

          64f3fd6d507e9d364f1f15f0fe05338a698103dacd4cae308ba0fe70568dbbbc95efb7779482b4a5ccf31554b538bb69d136aacdac8df5cf94328cf753bdf84f

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

          Filesize

          344B

          MD5

          ca2c13e18b7a88ab29896cf40e61f21d

          SHA1

          334ae46eab3ba393c9b4666bbca5dd9fd6036ac7

          SHA256

          9593252b92b04e4b98adfe75df0e67d0e4e98568b8de1d3bdfa4a684742207f2

          SHA512

          fd2ce643e02591ec3a997619c7b36508fb2fc4d3bbcc556b61ba8f0e680354250c104ae9c32c1298d410d2f6af7e2cba673d0d5ea622376ca0661cf00b257c07

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

          Filesize

          344B

          MD5

          c72ed469d6728368fbfdef101498476f

          SHA1

          eeef3f9c6ab3cfa95a138a0c1a19fa98a6ebbf92

          SHA256

          e14866264753026a0678b334ce6b9b333b50dac6c02534634c6d379c361a857a

          SHA512

          dfd99db379a2e5e7ee975f0de401fd2400dabe24174412dfdc30b8678bd35c87ed333551ce41aeab6cab216be447bee5630333e0691e72d01c99745a017e3c3b

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

          Filesize

          344B

          MD5

          137c0eec130c843034ec5370cdc2425c

          SHA1

          2f2d46ad6fc959aad39894db28b7faae2d85d91b

          SHA256

          1e99680863e774871269625c233714fa7e1e1ac71bd7907db3faa39fe78c9362

          SHA512

          7b61f8248b6e8da5bcd8c14ebd9511b7127cfde6994145ca46106d85c7742b4837f370b95ec0fc2e0cc82c4c9da861b9544ed5f5ebc9616a8d33394c8664eacd

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

          Filesize

          344B

          MD5

          15cc695a7b0ceb8cc0fe2b61cc0aabcb

          SHA1

          c11d1871c6277bf3e581a39f584df1e565d1a82d

          SHA256

          929b0b733bd759758713484f0ce58f74f02b4084412eaca73c4f8059cefe6e37

          SHA512

          8aec2859b4e45f6f4766a07eb8f75e7de4443b1d154176b9daa13d1deef55bf1206e22e557e85a71c3625ea38d63851be7043a78593d0dc046b86a461a32d635

        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

          Filesize

          530KB

          MD5

          862e7aeb18ba5892f51b5712a213a614

          SHA1

          99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

          SHA256

          44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

          SHA512

          678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

        • C:\Users\Admin\AppData\Local\Temp\Cab28D8.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab2909.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar296B.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat

          Filesize

          4B

          MD5

          aa36c88c27650af3b9868b723ae15dfc

          SHA1

          c352b4186577a7e29e886023443d331f41e022f2

          SHA256

          f2c8a205eccaca21250b2ab19655462e91b28f93a94118821e8e1ec4124abf4b

          SHA512

          0672b2ffc8b42d3d4b2b9adef1e8dfb43fad0ce6f059970ef45f098c0dbbaf1bad47857799987b88fcb9dff10a292eb85547bccfc1c94c81d5aabfdbc3306906

        • memory/2204-5-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

          Filesize

          9.9MB

        • memory/2204-0-0x00000000012B0000-0x000000000133A000-memory.dmp

          Filesize

          552KB

        • memory/2204-2-0x000000001B060000-0x000000001B0E0000-memory.dmp

          Filesize

          512KB

        • memory/2204-1-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

          Filesize

          9.9MB

        • memory/2556-10-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

          Filesize

          9.9MB

        • memory/2556-11-0x0000000000B40000-0x0000000000BC0000-memory.dmp

          Filesize

          512KB

        • memory/2556-9-0x00000000013E0000-0x000000000146A000-memory.dmp

          Filesize

          552KB

        • memory/2556-346-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

          Filesize

          9.9MB

        • memory/2808-248-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

          Filesize

          9.9MB

        • memory/2808-347-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

          Filesize

          9.9MB

        • memory/2808-348-0x000000001AD00000-0x000000001AD80000-memory.dmp

          Filesize

          512KB