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
    299s
  • max time network
    306s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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#.

  • Checks computer location settings 2 TTPs 6 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 11 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 3 IoCs
  • 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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of WriteProcessMemory 22 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4112
    • 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⤵
      • Suspicious use of WriteProcessMemory
      PID:4788
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2388
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4764
        • 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:4592
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"
          3⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:1824
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpF04B.tmp" -C "C:\Users\Admin\AppData\Local\d67800nkmj"
            4⤵
              PID:1860
            • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
              "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:3332
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4740
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1416 --field-trial-handle=2280,i,716736634476467098,11449718822158202904,262144 --variations-seed-version /prefetch:8
        1⤵
          PID:2888
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          1⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1116
          • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
            "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
            2⤵
            • Executes dropped EXE
            PID:5064
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          1⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4508
          • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
            "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
            2⤵
            • Executes dropped EXE
            PID:1156
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          1⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1320
          • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
            "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
            2⤵
            • Executes dropped EXE
            PID:2104
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          1⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1600
          • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
            "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
            2⤵
            • Executes dropped EXE
            PID:776

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\m1f1f3a069223072f8d6802a079235d.exe.log

          Filesize

          847B

          MD5

          3308a84a40841fab7dfec198b3c31af7

          SHA1

          4e7ab6336c0538be5dd7da529c0265b3b6523083

          SHA256

          169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

          SHA512

          97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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

          Filesize

          306KB

          MD5

          4b36dcaa94c3eca48a6292bd670ffe79

          SHA1

          705484e61ac39ba02cc80903be0da6ce74333334

          SHA256

          c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9

          SHA512

          cf07d7f80264554eb3b945421ca41db38ff79707775d355d478c09f4b64d14f523339295aa4bc9b79c0dbb004e6756585bcf85edc8cbc2d16f7f0481be93513a

        • C:\Users\Admin\AppData\Local\Temp\tmpF04B.tmp

          Filesize

          13.3MB

          MD5

          89d2d5811c1aff539bb355f15f3ddad0

          SHA1

          5bb3577c25b6d323d927200c48cd184a3e27c873

          SHA256

          b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

          SHA512

          39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

        • C:\Users\Admin\AppData\Local\d67800nkmj\data\cached-microdesc-consensus.tmp

          Filesize

          2.7MB

          MD5

          a0db8a87f7b723266c8b04255da46b06

          SHA1

          4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

          SHA256

          60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

          SHA512

          41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

        • C:\Users\Admin\AppData\Local\d67800nkmj\data\cached-microdescs.new

          Filesize

          20.4MB

          MD5

          61f3b29535702448213fc8f0ce1f01d6

          SHA1

          cd6700fc1b27b80e131e12ef2e4ba70d01375303

          SHA256

          8ecd31cb649c985e5d1efe5a3d952d2a5d38411ed72c59fa0bd93c8bd6906ed8

          SHA512

          5fa174296b7fa057efc92e9dc83658a7bfce3fe9ae5ea7df765ebd8e00b1ccaea1d01b6c888ca875358ffa2fc2e5f32eb7bb0eb57bb18c74296a23ca988804a1

        • C:\Users\Admin\AppData\Local\d67800nkmj\host\hostname

          Filesize

          64B

          MD5

          42cd71e064ef0d7d549a2b5007057bd7

          SHA1

          699f7e4febf2620ab633481420fe859a91b71dd7

          SHA256

          0d06521db10fc7299fddd1bb94fe6103dcace28b6e63b21888092f378e847ef6

          SHA512

          45710d543be7146b1b6ed06c4091f78ef6c85c62317b62bfa41abb3b985550c3cd3c6593a8965ecd3d353be2e5acead2eb07399a923d1d9e697a2fceb7ea97cd

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

          Filesize

          4B

          MD5

          83da7c539e1ab4e759623c38d8737e9e

          SHA1

          719a4259ce7449d0e18f62063ac07e550ccad238

          SHA256

          f548d6697dd29f405ebb371d243002eb9babde9a3602aedbe5bc0d9ed1c6ff34

          SHA512

          092673c1429aa0000fcdcb610f32979427eb39da5981e243392b3f7d07b40eb8ce29045f3be0ef8563dddba88e226a25cf350aa9125b38d4aa9499f52ff1ac08

        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe

          Filesize

          7.4MB

          MD5

          88590909765350c0d70c6c34b1f31dd2

          SHA1

          129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

          SHA256

          46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

          SHA512

          a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

        • C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt

          Filesize

          218B

          MD5

          e13224c550d15d9bc87cf44652be569f

          SHA1

          c920915db4874bad51ccc34d2308d21ca1d5fb75

          SHA256

          6fbc1d3833c4f62e3485c4ba1d635cdae78cc96fdb36e277047eae01a4d91c1e

          SHA512

          e672ef58a29d92e597a8f890a7c32dbc6375ae84bdb14feb2cf12ec6ed5b037650d8821d7e5fe83d842ab351894fb15291700ee3995942b1b127d2adb9d102a0

        • memory/1116-79-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1116-80-0x0000019815AD0000-0x0000019815AE0000-memory.dmp

          Filesize

          64KB

        • memory/1116-83-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1320-105-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1320-103-0x00000228E9650000-0x00000228E9660000-memory.dmp

          Filesize

          64KB

        • memory/1320-102-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1600-107-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1600-109-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1824-53-0x000001F5ED910000-0x000001F5ED920000-memory.dmp

          Filesize

          64KB

        • memory/1824-12-0x000001F5ED910000-0x000001F5ED920000-memory.dmp

          Filesize

          64KB

        • memory/1824-52-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/1824-11-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/4112-2-0x0000024576DB0000-0x0000024576DC0000-memory.dmp

          Filesize

          64KB

        • memory/4112-1-0x00007FFEABB30000-0x00007FFEAC5F1000-memory.dmp

          Filesize

          10.8MB

        • memory/4112-0-0x000002455C7A0000-0x000002455C7F2000-memory.dmp

          Filesize

          328KB

        • memory/4112-6-0x00007FFEABB30000-0x00007FFEAC5F1000-memory.dmp

          Filesize

          10.8MB

        • memory/4508-97-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/4508-98-0x000001D95FF40000-0x000001D95FF50000-memory.dmp

          Filesize

          64KB

        • memory/4508-100-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/4740-17-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/4740-15-0x00007FFEAA6A0000-0x00007FFEAB161000-memory.dmp

          Filesize

          10.8MB

        • memory/4740-16-0x00000205DE160000-0x00000205DE170000-memory.dmp

          Filesize

          64KB