Resubmissions

10-04-2024 02:52

240410-dcqxlaff2v 10

10-04-2024 02:52

240410-dcqltscc72 10

10-04-2024 02:51

240410-dcm6pscc67 10

10-04-2024 02:51

240410-dcmj6scc66 10

14-10-2023 04:10

231014-erhp7sga6y 10

Analysis

  • max time kernel
    595s
  • max time network
    600s
  • 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 02:51

General

  • Target

    f21559ac7c67d871d4f05.exe

  • Size

    327KB

  • MD5

    78fd6df30f791c7b5f45dca0b4c952a5

  • SHA1

    d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

  • SHA256

    dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

  • SHA512

    abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

  • SSDEEP

    6144:Vc6sWfGY/yODx332tOIXlU1QWZxXAnuHW9bbGDwVdqe1mM:Ps+CXIAuGG8dA

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot5968091729:AAHVag_ncx5c5AIYERGTqv9kr7clJT1_HDU/sendMessage?chat_id=-1001962300376

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Checks computer location settings 2 TTPs 12 IoCs

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

  • Executes dropped EXE 22 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
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of WriteProcessMemory 34 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\f21559ac7c67d871d4f05.exe
    "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3632
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3544
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3164
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4232
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1540
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.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:4140
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp5D24.tmp" -C "C:\Users\Admin\AppData\Local\z1jp774dks"
            4⤵
              PID:2776
            • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
              "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:4496
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1804
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2076
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2924
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4692
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2260
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2132
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2772
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4920
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1284
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3964
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2556
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1240
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4736
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1196
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:400
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3508
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4968
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5072
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1564
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4904

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\f21559ac7c67d871d4f05.exe.log

        Filesize

        847B

        MD5

        3308a84a40841fab7dfec198b3c31af7

        SHA1

        4e7ab6336c0538be5dd7da529c0265b3b6523083

        SHA256

        169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

        SHA512

        97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe

        Filesize

        327KB

        MD5

        78fd6df30f791c7b5f45dca0b4c952a5

        SHA1

        d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

        SHA256

        dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

        SHA512

        abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

      • C:\Users\Admin\AppData\Local\Temp\tmp5D24.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

      • C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-microdesc-consensus.tmp

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

      • C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-microdescs.new

        Filesize

        5.6MB

        MD5

        034f3125b4c26b1fb31b38e0b8726f1f

        SHA1

        11209cfe21e921412d9a9ce49491f23d0bd5b15d

        SHA256

        26fec4e4f9243613eae60171f860c4e9035553ec63054a144b825c16b7d5e0fe

        SHA512

        a4b4214bcc210d85bb85c4a6d640e66ac9c431ff10b3dff2a74e051ff89ed2a007c39c3ca39f20b756a94ce39f4d1c49542d58968f147b5a5405cda5e64f0708

      • C:\Users\Admin\AppData\Local\z1jp774dks\host\hostname

        Filesize

        64B

        MD5

        fb21077235900d68f8895871d39b29ab

        SHA1

        a6893e82462ecca02bb657818188030ad542b0fd

        SHA256

        0a3bebc6c89cdf58d69f4f8abf6654fb7739347d4e8b859d49b8af44ff18be67

        SHA512

        18497a224ac10c11ae3739ede5e18565158ac98948e0a76ca4fa8e048adf14c3f1df5fff124a8f4af9cd9f272c65532c1ea620eaf11b2424153ba22802adfe52

      • C:\Users\Admin\AppData\Local\z1jp774dks\port.dat

        Filesize

        4B

        MD5

        c1a3d34711ab5d85335331ca0e57f067

        SHA1

        8c08849e51e962ed716f8b22cf79c399be5034d7

        SHA256

        eac627facfe5f552055d76c0196a0ffc413dfeb940bc0ccb85b60fcaf7b773f5

        SHA512

        dff23d88e0738b650ac46f1a2bab08588fae87a49731ff875b9be1433bd0aab6f3870a86f383a6ffb6363162bf9b8ab96be9f720ffc7e7133d86a14e37ce8b4a

      • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe

        Filesize

        7.4MB

        MD5

        88590909765350c0d70c6c34b1f31dd2

        SHA1

        129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

        SHA256

        46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

        SHA512

        a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

      • C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt

        Filesize

        218B

        MD5

        9e84e964b521b91eda926560ea389c43

        SHA1

        8dd28a62c8c1e4cd9d0707d54a3220cde4e07ff1

        SHA256

        a63295928b35f44ac250fa2f0343b1c279c10cae6452a605c0a383ffad86d2b0

        SHA512

        6c987d545b27c707b895272b043023293f81df1ab9f657de034d5e22047e41efd5d294b7c87d4a8039629e23f66068509063e02916f136d9a25e136a5d78f4f9

      • memory/400-151-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/400-149-0x00000224D4800000-0x00000224D4810000-memory.dmp

        Filesize

        64KB

      • memory/400-148-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1284-122-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1284-120-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1564-169-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1564-172-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1564-170-0x00000248F3730000-0x00000248F3740000-memory.dmp

        Filesize

        64KB

      • memory/1804-57-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/1804-58-0x00000231C2F70000-0x00000231C2F80000-memory.dmp

        Filesize

        64KB

      • memory/1804-61-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2260-102-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2260-103-0x000001D6F4D00000-0x000001D6F4D10000-memory.dmp

        Filesize

        64KB

      • memory/2260-105-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2556-134-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2556-132-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2772-114-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2772-112-0x0000015A2FDE0000-0x0000015A2FDF0000-memory.dmp

        Filesize

        64KB

      • memory/2772-111-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2924-86-0x000001DFE0660000-0x000001DFE0670000-memory.dmp

        Filesize

        64KB

      • memory/2924-85-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/2924-88-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/3632-6-0x00007FFB677A0000-0x00007FFB68261000-memory.dmp

        Filesize

        10.8MB

      • memory/3632-0-0x000001EA30350000-0x000001EA303A8000-memory.dmp

        Filesize

        352KB

      • memory/3632-3-0x00007FFB677A0000-0x00007FFB68261000-memory.dmp

        Filesize

        10.8MB

      • memory/3632-4-0x000001EA32170000-0x000001EA32180000-memory.dmp

        Filesize

        64KB

      • memory/4140-12-0x000002434FE60000-0x000002434FE70000-memory.dmp

        Filesize

        64KB

      • memory/4140-11-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/4140-55-0x000002434FE60000-0x000002434FE70000-memory.dmp

        Filesize

        64KB

      • memory/4140-54-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/4736-146-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/4736-144-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/4968-157-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB

      • memory/4968-159-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

        Filesize

        10.8MB