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
    359s
  • max time network
    552s
  • 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 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 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:2324
    • 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:2528
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2644
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2656
        • 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:3008
        • 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:2736
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2736 -s 1384
            4⤵
              PID:3052
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {19CC533C-7A01-4001-9737-843A1EB9FE54} S-1-5-21-2297530677-1229052932-2803917579-1000:HKULBIBU\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:936
        • 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:716
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 716 -s 1324
            3⤵
              PID:1864

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          344B

          MD5

          d60318c320e73be135a17267319e0d79

          SHA1

          086086eb8eb689c69323cd1831363872c2d2af6b

          SHA256

          2003004c2609492f47f3b20a8f92a625b8444b15f1adbf0bacf87cb5a4dcceb5

          SHA512

          83885e93da13f539c5dfdf71841cc48b9d703560e7eb07dbc441db61210ee158f67be9fe76eb3c2b57ce76d851b0d09d0d42b4114f8b5969c1abc7ad9e1c4794

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

          Filesize

          344B

          MD5

          3ae0d1d9093a2121cff255ca2ebaff16

          SHA1

          a002da2867c692330d967d87d86e882c4e8a3dd9

          SHA256

          726287cd2ba8035783f8ef8aa3b8711cfb002cd0e8cb20aeb0c39033214152b0

          SHA512

          106f50c866bc7c82ae904ad92b6fd6311c52502a978c04ff4432dbb7aa554caa6e0c95507a2d0dac44add45bf8bba926e113cb35de1a1df7e9f30acc803b1ff3

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

          Filesize

          344B

          MD5

          d607edfb0fa879463aa79c77fac0e156

          SHA1

          e0db3baf30bbe44a655e627fc925abb9e823aab3

          SHA256

          2600b4573fca2ee03bfddada78d505f9857385681ef6bcce6278d204f0f73608

          SHA512

          40c147f607b872b50bff197e6c3e5629f7ead61d87c04ee1903a60bb8ecf168c403eb6213e4e47903860d364c6df0c27322ba3c56a52db34bbeef315aadf70fb

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

          Filesize

          344B

          MD5

          82d3e2197ac61cce4fa8765183077be9

          SHA1

          e87942bf004af1aa38a114af7234069cd68277fe

          SHA256

          2497fc11e3f742bccd4a5f854a4276d88350293668ef7dec7ead65a62b59d6ec

          SHA512

          ff9f594b3ba469b85681737be6cbda26e1c652209d3ad5a7d5cd02e3cafc2b07c6108bba0c80aea90ef01428fb173eed5def10aa2de21729d77508271a781f09

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

          Filesize

          306KB

          MD5

          4b36dcaa94c3eca48a6292bd670ffe79

          SHA1

          705484e61ac39ba02cc80903be0da6ce74333334

          SHA256

          c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9

          SHA512

          cf07d7f80264554eb3b945421ca41db38ff79707775d355d478c09f4b64d14f523339295aa4bc9b79c0dbb004e6756585bcf85edc8cbc2d16f7f0481be93513a

        • C:\Users\Admin\AppData\Local\Temp\Cab2F1F.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab2F5F.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar2FC2.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

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

          Filesize

          4B

          MD5

          f752582986d70327ae2e8dd9aea7f976

          SHA1

          01e42ae96b86995418054197a131c84b4a874cb5

          SHA256

          1d89cd7e54411b3939127ffd58882dbd517a06b1707f21ae3dd1856fe9e4c07e

          SHA512

          1ca44e4a630f10a3546ad9df259aa5b11cc4897ab785eca9ae4c0f0233acbca1c38d199911003d502c6b26705045a610412b66f389cde262fff58377c4fc7eca

        • memory/716-211-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/716-176-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2324-0-0x0000000000FA0000-0x0000000000FF2000-memory.dmp

          Filesize

          328KB

        • memory/2324-5-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

          Filesize

          9.9MB

        • memory/2324-2-0x000000001B0B0000-0x000000001B130000-memory.dmp

          Filesize

          512KB

        • memory/2324-1-0x000007FEF5C40000-0x000007FEF662C000-memory.dmp

          Filesize

          9.9MB

        • memory/2736-10-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2736-174-0x000000001B430000-0x000000001B4B0000-memory.dmp

          Filesize

          512KB

        • memory/2736-173-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2736-11-0x000000001B430000-0x000000001B4B0000-memory.dmp

          Filesize

          512KB

        • memory/2736-9-0x0000000000B70000-0x0000000000BC2000-memory.dmp

          Filesize

          328KB