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
    1556s
  • max time network
    1559s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:49

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 10 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:2192
    • 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:2372
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2788
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2684
        • 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:2624
        • 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:2648
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2648 -s 2336
            4⤵
              PID:2516
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {FC2A29EF-BF7A-4BB0-B46D-49CD5881F157} S-1-5-21-778096762-2241304387-192235952-1000:AYFLYVMK\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2464
        • 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:528
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 528 -s 972
            3⤵
              PID:2032

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

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

          Filesize

          344B

          MD5

          39f94244113951a737d19a68046fd128

          SHA1

          6f505d6e5765d7b4633097afc15dd4de078decbb

          SHA256

          0d041df8a2ca4005739a6e01ca12fdbc0e6ac9a4b9283dea8df918c57973a9c1

          SHA512

          c451ce426a979f03100c45a06f61e8b64117b52ed04d0dd452966f03eb8528cfc3015742b1706b9cb9ac0bb076a9b05af7080ef73e38257409c814c6e9f0bbe5

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

          Filesize

          344B

          MD5

          2286ef4c005fabbf791cfb7deb85e192

          SHA1

          80133935a3eacd9132174520f0d79cfab6b932aa

          SHA256

          bbe4cb5ed6d45f5f13fcb7e2ee7909350e58912c301853d371dc8a2fce847dde

          SHA512

          1594a29da2784f68074866c6ffc3d71b8b37b92ce5ea349b3387f1ecd594b4afa0465de5d14549a33632f79e5aadb2ef2adad9ef851a4a1fd7a36700bf32a87c

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

          Filesize

          344B

          MD5

          377301db8dd9a3e25f064f80ce957659

          SHA1

          6f6ce6d4579aaf0ac303c34cdd3b6522d0055a57

          SHA256

          2ae906f89033509109917ede6d69d4f89129e7f6545d05680f897376345af460

          SHA512

          934c4421e6566f1987eaa2be383a03be969651004b0417bb54436ce4504aef67cf9f707144138b8e7dd8f36ef4fea4e831b55a66e3e45d6d85765247ad78295a

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

          Filesize

          344B

          MD5

          17fe23755461a017c3448c56a50cfc55

          SHA1

          99d8ae8cefcb3ade1b4044491fc07809365bea32

          SHA256

          53b06b5afaa5d36647fd7dddea0d7b3409bed5807ddb5db8398a2fbcd86d1cda

          SHA512

          657bf40445f76010e7140c9b465182976c67fe327125870d528014273647944387c00d5684a1a4d4a90f27b8dcbf57249c0808a832064b4801d4cf721fc76fe4

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

          Filesize

          344B

          MD5

          2de1f2c941e6ecabf18ab26925f809ee

          SHA1

          ddc9fdd7831507320951e4139e1d53fde0530154

          SHA256

          58f5c284b1e88805256de3229584541d10198871e7a0278de0b9c7c93754c1dd

          SHA512

          e9f5c4e592eb21b6088f293a2e7ed5a6fba7253667362901d337ef9623db5d1e584839a835d8f7f29a305719128e697ed92fb4bb135100be8aa2c8ec754f19d3

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

          Filesize

          344B

          MD5

          fafe68a9fe2e1c5a134c30ea988b81e8

          SHA1

          d5fb3603d499e866e2f9f28e2f1d6100f0d1c542

          SHA256

          87d1ab5e141a76a25032b5454051ee9a1fefe23ad05a2ebb0ab59c405afaede0

          SHA512

          ad24d18bb8a61f0ed520a1aadced8ab806f1c251e6dc697b748b4925b8e0c315388ee8bb18bf1fe3050759cae5847e78e6d1f8f42c42a06a61ff395212d08517

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

          Filesize

          530KB

          MD5

          862e7aeb18ba5892f51b5712a213a614

          SHA1

          99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

          SHA256

          44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

          SHA512

          678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

        • C:\Users\Admin\AppData\Local\Temp\Cab7986.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Tar79B8.tmp

          Filesize

          171KB

          MD5

          9c0c641c06238516f27941aa1166d427

          SHA1

          64cd549fb8cf014fcd9312aa7a5b023847b6c977

          SHA256

          4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

          SHA512

          936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

        • C:\Users\Admin\AppData\Local\Temp\Tar7A7B.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

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

          Filesize

          4B

          MD5

          325995af77a0e8b06d1204a171010b3a

          SHA1

          100b228db4a44137777412c9816c87aba4b37cc5

          SHA256

          9552186d84ad5c6e459ce386f5ba884aa4219a0c763bc285da9edb9b03180f93

          SHA512

          3ee6e23d87b07d221587f3077c525dbccd8a43237368569559ba195f8cab900b25cec3df152b7b4f59f8eb57bdc9fb0063da378af60e7cc9e131838f38d64e1d

        • memory/528-267-0x000007FEF4B00000-0x000007FEF54EC000-memory.dmp

          Filesize

          9.9MB

        • memory/528-295-0x000007FEF4B00000-0x000007FEF54EC000-memory.dmp

          Filesize

          9.9MB

        • memory/528-296-0x000000001B120000-0x000000001B1A0000-memory.dmp

          Filesize

          512KB

        • memory/2192-5-0x000007FEF54F0000-0x000007FEF5EDC000-memory.dmp

          Filesize

          9.9MB

        • memory/2192-2-0x0000000002220000-0x00000000022A0000-memory.dmp

          Filesize

          512KB

        • memory/2192-1-0x000007FEF54F0000-0x000007FEF5EDC000-memory.dmp

          Filesize

          9.9MB

        • memory/2192-0-0x0000000000C40000-0x0000000000CCA000-memory.dmp

          Filesize

          552KB

        • memory/2648-10-0x000007FEF4B00000-0x000007FEF54EC000-memory.dmp

          Filesize

          9.9MB

        • memory/2648-265-0x000007FEF4B00000-0x000007FEF54EC000-memory.dmp

          Filesize

          9.9MB

        • memory/2648-11-0x000000001AE00000-0x000000001AE80000-memory.dmp

          Filesize

          512KB

        • memory/2648-9-0x0000000000350000-0x00000000003DA000-memory.dmp

          Filesize

          552KB