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
    122s
  • max time network
    258s
  • 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 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\m1f1f3a069223072f8d6802a079235d.exe
    "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1948
    • 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:1416
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2904
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2500
        • 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:2640
        • 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:2644
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2644 -s 1328
            4⤵
              PID:1180
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {459700DD-E3AF-4E7F-BA8D-102806B55254} S-1-5-21-3787592910-3720486031-2929222812-1000:HSNHLVYA\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2364
        • 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:2172
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2172 -s 1320
            3⤵
              PID:2124

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

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

          Filesize

          304B

          MD5

          4528a14b7b85658a1cafec75fe4efbd2

          SHA1

          3ed5c8eeb21118b66b659507954bbb1e777b519b

          SHA256

          cf0eb2f0a7e931ed1861c27a3719bbdda23403a3e9275fcfd7a65893cd011b67

          SHA512

          acbd9a30c32156a07cb8c77ac7abca99bfa6b4e14aed76fd65e4d50622cf15f131692bdc6886cba6f67d33e8c6ae603613bb8126f43d36ab2f6452a7f036c52e

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

          Filesize

          304B

          MD5

          e355e9f8901ef9f7469c61fd77bb6063

          SHA1

          f917acd9985b24155ae04e9ab970eda5bda0c854

          SHA256

          c9220800b7a25a9b71a3248c2b8f3ceabd9ed166b6b1f4214922e1aaee7db728

          SHA512

          06960ccc407adab8c10ff505585e18c5c5018d4853d75e381124a185d0f38f6309dc6536099aa11718b84d1e8a65a2760b9ee953bfda43047ca0ec5919a29c6d

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

          Filesize

          304B

          MD5

          9e9a417f91c06f0556e0efe8e1a98687

          SHA1

          50e3a1e193b370fcd30fffef2df367c5b5e66701

          SHA256

          035102d2112690bf3171e8c9e9b78c4673361547ccf1b5c3fe102548a701c3a9

          SHA512

          40325f8725771084fd37f865f71a760befda6116010ca3569d714f8d8a72b5f0ddf0819547dffdb8665876a8088f5247bf8915f3dc9d1f8a3a79bd8301fd7542

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

          Filesize

          306KB

          MD5

          4b36dcaa94c3eca48a6292bd670ffe79

          SHA1

          705484e61ac39ba02cc80903be0da6ce74333334

          SHA256

          c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9

          SHA512

          cf07d7f80264554eb3b945421ca41db38ff79707775d355d478c09f4b64d14f523339295aa4bc9b79c0dbb004e6756585bcf85edc8cbc2d16f7f0481be93513a

        • C:\Users\Admin\AppData\Local\Temp\Cab78CB.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab78DD.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar795F.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

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

          Filesize

          4B

          MD5

          f19c44d068fecac1d6d13a80df4f8e96

          SHA1

          cf414a477b183215e009258e28a04bb2015a90cf

          SHA256

          000c15d0ea8224c9649c9adee30c3030ee769b2b5f6d6594f94d446adf60396b

          SHA512

          178a7f8941402a1ae09793297ae9e430ef6e06a9d35648bc6087899ad79cbbd3c09f30a5eae1c7cec8c316f5dba9a275ec3d4d0e720c028e0533b3595d08dedf

        • memory/1948-0-0x00000000013A0000-0x00000000013F2000-memory.dmp

          Filesize

          328KB

        • memory/1948-5-0x000007FEF5890000-0x000007FEF627C000-memory.dmp

          Filesize

          9.9MB

        • memory/1948-2-0x000000001ADD0000-0x000000001AE50000-memory.dmp

          Filesize

          512KB

        • memory/1948-1-0x000007FEF5890000-0x000007FEF627C000-memory.dmp

          Filesize

          9.9MB

        • memory/2172-14-0x000007FEF4EA0000-0x000007FEF588C000-memory.dmp

          Filesize

          9.9MB

        • memory/2172-209-0x000007FEF4EA0000-0x000007FEF588C000-memory.dmp

          Filesize

          9.9MB

        • memory/2644-11-0x000000001B450000-0x000000001B4D0000-memory.dmp

          Filesize

          512KB

        • memory/2644-10-0x000007FEF4EA0000-0x000007FEF588C000-memory.dmp

          Filesize

          9.9MB

        • memory/2644-9-0x0000000000E60000-0x0000000000EB2000-memory.dmp

          Filesize

          328KB

        • memory/2644-208-0x000007FEF4EA0000-0x000007FEF588C000-memory.dmp

          Filesize

          9.9MB