Resubmissions

10-04-2024 02:28

240410-cyaxtsca43 10

10-04-2024 02:28

240410-cx45aaca36 10

10-04-2024 02:28

240410-cx4hrafc61 10

10-04-2024 02:28

240410-cx37zsfc6y 10

14-10-2023 01:16

231014-bm3ysshd6t 10

Analysis

  • max time kernel
    844s
  • max time network
    845s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:28

General

  • Target

    m1f1f3a069223072f8d6802a079235d.exe

  • Size

    306KB

  • MD5

    4b36dcaa94c3eca48a6292bd670ffe79

  • SHA1

    705484e61ac39ba02cc80903be0da6ce74333334

  • SHA256

    c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9

  • SHA512

    cf07d7f80264554eb3b945421ca41db38ff79707775d355d478c09f4b64d14f523339295aa4bc9b79c0dbb004e6756585bcf85edc8cbc2d16f7f0481be93513a

  • SSDEEP

    3072:71E/yXS0m2pOVLVewP2D/kIyC+mvXi1QJIkjXAToknBq9tT/8RJ6W3t3dpdQGqKI:7E2mDMtqa5EOTeKXAllKD9bmTneefA

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6209822134:AAHQxD-CI1YDVcNbXijXHlonsEUgv3dfYtg/sendMessage?chat_id=-1001529292045

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 12 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\m1f1f3a069223072f8d6802a079235d.exe
    "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1752
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2112
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2532
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2616
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2260
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2552
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2552 -s 1904
            4⤵
              PID:2412
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {24858305-6AD6-4D63-8B80-FB95E74240DD} S-1-5-21-1298544033-3225604241-2703760938-1000:IZKCKOTP\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:960
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.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:1324
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1324 -s 1512
            3⤵
              PID:1964

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          344B

          MD5

          511a2b2ee43889078073cc20f09e5cdf

          SHA1

          692542ced288358acf9caa86c3b3f1ca1bd9f852

          SHA256

          b45c33e294716be8bf796e481c46c8ac17f4b7f6cd20e8226be853b2e1d4b7c4

          SHA512

          0f8bfb521ffddd7c531949d40bb3a122764cce62e638fa874ebf871ad02ecd6c3c2118dc20abad346248c3eb95938cd012d6d53407958cf38fb678c23d54eb02

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

          Filesize

          344B

          MD5

          b063773983abc3f6828a3c1dd53db14d

          SHA1

          f44dc0db949ffb61534d427ae818553c524044de

          SHA256

          ae76af263d3d9fb01b9f3c0ba6ca5fe78bdfa218b23de82b25ceca04b18ce832

          SHA512

          2a0c1c99a2e0aa83011d3bb7fbe33925cecaa881790d6535981fc0b0d0d52310009208a4ed0b8ed023f2b497b388bd6fe3a875d1491aa276dceb55b9229cb146

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

          Filesize

          344B

          MD5

          b8ecfda6e653dfca8cb04296000deb7d

          SHA1

          270824c996513f389341545fae278ae6626ab78d

          SHA256

          3829391c926e1c20e30766b35eebdd7f6596d743aadddf0b441e01f91fbe7767

          SHA512

          4b27b78dcd1d48e7c1721e469d52c7ca94068d0d336d85968ed103fc85e5b275a7b31406331becb6db873b71d6f613901af50d5bdf14a509d02248b11b1dcb52

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

          Filesize

          344B

          MD5

          50c2ffca6c86ae714bbc469e684d8831

          SHA1

          0e5ae1e963f656402a91d9594f638f377ebdd284

          SHA256

          57574aa57492d77f5b3bd748d2b9c049bf3f65605675eb1fcb15f779022959eb

          SHA512

          720f649f8a037d4fde91b998270b7448112d131796909a4e6bfb2ee90c90f1e8609b5380a9dd0d263c7b0c5aff4e24eebf307f660b7c3327bfc4365f62484681

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

          Filesize

          344B

          MD5

          1e38f9744fa4f459c71f2e073a057a75

          SHA1

          625aadad59c4644432c281427e3ee6b2c5379466

          SHA256

          7a9b499e70168992cd760bf66f1fa56ad9401efebd2284f1ce273be54d785a3c

          SHA512

          29a617eb9e209b80579d3f2946795350a5c88897baf150f38fd30141895a5b422562116fa3a7bb936c964943f7d81d410609b6949eb3f2b88488210dc0963c76

        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe

          Filesize

          306KB

          MD5

          4b36dcaa94c3eca48a6292bd670ffe79

          SHA1

          705484e61ac39ba02cc80903be0da6ce74333334

          SHA256

          c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9

          SHA512

          cf07d7f80264554eb3b945421ca41db38ff79707775d355d478c09f4b64d14f523339295aa4bc9b79c0dbb004e6756585bcf85edc8cbc2d16f7f0481be93513a

        • C:\Users\Admin\AppData\Local\Temp\Cab4991.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab4A62.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar49A5.tmp

          Filesize

          171KB

          MD5

          9c0c641c06238516f27941aa1166d427

          SHA1

          64cd549fb8cf014fcd9312aa7a5b023847b6c977

          SHA256

          4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

          SHA512

          936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

        • C:\Users\Admin\AppData\Local\Temp\Tar4A96.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\d67800nkmj\port.dat

          Filesize

          4B

          MD5

          65d2ea03425887a717c435081cfc5dbb

          SHA1

          9cdda67ded3f25811728276cefa76b80913b4c54

          SHA256

          a85e9db4851f7cd3efb8db7bf69a07cfb97bc528b72785a9cff7bdfef7e2279d

          SHA512

          f620ea9ab05df05bb794a2add59a984419bcb1b76168eb7b5089e5f44d117d965f634c9a3cb48f5cbb6da5c04a1484b6e684a944e887b66aad5ddbdd6e32568d

        • memory/1324-344-0x000007FEF54B0000-0x000007FEF5E9C000-memory.dmp

          Filesize

          9.9MB

        • memory/1324-384-0x00000000010F0000-0x0000000001170000-memory.dmp

          Filesize

          512KB

        • memory/1324-383-0x000007FEF54B0000-0x000007FEF5E9C000-memory.dmp

          Filesize

          9.9MB

        • memory/1752-0-0x00000000002D0000-0x0000000000322000-memory.dmp

          Filesize

          328KB

        • memory/1752-5-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

          Filesize

          9.9MB

        • memory/1752-2-0x000000001AEA0000-0x000000001AF20000-memory.dmp

          Filesize

          512KB

        • memory/1752-1-0x000007FEF5EA0000-0x000007FEF688C000-memory.dmp

          Filesize

          9.9MB

        • memory/2552-11-0x000000001B340000-0x000000001B3C0000-memory.dmp

          Filesize

          512KB

        • memory/2552-342-0x000000001B340000-0x000000001B3C0000-memory.dmp

          Filesize

          512KB

        • memory/2552-341-0x000007FEF54B0000-0x000007FEF5E9C000-memory.dmp

          Filesize

          9.9MB

        • memory/2552-10-0x000007FEF54B0000-0x000007FEF5E9C000-memory.dmp

          Filesize

          9.9MB

        • memory/2552-9-0x00000000011F0000-0x0000000001242000-memory.dmp

          Filesize

          328KB