Resubmissions

10-04-2024 02:38

240410-c4pceacb24 10

10-04-2024 02:37

240410-c4ne4scb23 10

10-04-2024 02:37

240410-c4llhsca99 10

10-04-2024 02:37

240410-c4jf6aca98 10

14-10-2023 01:31

231014-bxezqahg8w 10

Analysis

  • max time kernel
    845s
  • max time network
    917s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:37

General

  • Target

    k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

  • Size

    339KB

  • MD5

    1cab66a5c15f97f040fb23d354d04a9c

  • SHA1

    f0dbebd22b2c7bfedbefa4435b345c58416f9448

  • SHA256

    d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

  • SHA512

    a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

  • SSDEEP

    3072:gdrpN/JlLKd5hkad0lk0vGJGMlngDBXrkhamyeFykt9sxc8eTRLUvenjLM/zNlgl:0UGPUvva+lxXY6uXAJMI9bAV0D

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

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 6 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\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
    "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2972
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1652
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2620
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3000
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2584
        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2636
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2636 -s 1928
            4⤵
              PID:1740
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {D00FFEC7-BCB6-4B86-9D57-8744C8A637FA} S-1-5-21-3452737119-3959686427-228443150-1000:QGTQZTRE\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2424
        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:488
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 488 -s 2096
            3⤵
              PID:860

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          344B

          MD5

          f5f7a7e3b0a1b697fbbb0436b18e3dee

          SHA1

          1022d93e04944a63b5d669edcd0ade8842bb6a1f

          SHA256

          c19a06ea1ae49e6f8974d7595405fa9d7bdd2fbf3633a3f3028416b9ebbe6f36

          SHA512

          0f7ef576a46c583452fb78aee626be6c6ec9fc561538a0a9a8e7e4b05df3490596069e7cbc342280c89ef19b4443202b0169122e32bef71e2d7d180dab752bf6

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

          Filesize

          344B

          MD5

          298d89a8146e19ee13fc846545dba72d

          SHA1

          cb063fa7957b44c8f8dad531e6546bb52d59efda

          SHA256

          14108843206fbdb659fec8e6660dc444e81b03f601f35a8a5bbce6ce11707626

          SHA512

          a18b8ee7ce7d29ff400296f890d65c2e47cb5eaea6360026b15b120b5c0994539f58234370bbe410c5fdfe54d86275748f97c1779627529ecd3e03f9d67dd321

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

          Filesize

          344B

          MD5

          3ff83e909aff4b8d38d56ea2a8697340

          SHA1

          2f2faf44bb15417b0f516177d1a0266505056f05

          SHA256

          2853f4c66d23622eb769d54bda64397806381ac57c54c460cb2f0a464c0abe6a

          SHA512

          0cddf0bbd7ed63637dc3b9893ba7dc6cd15255456ae1eeb8b40d70851c7c565ed558d01f1f1a8794af9dfc7535cf3a8448a7f0e57798708465f33af019ab08ec

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

          Filesize

          344B

          MD5

          be2b9fd321e08d92b66b9969b85d7219

          SHA1

          d60a40f3f59168e839cad1febb702e313dbd4020

          SHA256

          8870e75b1f3b6ccac6da50c64f7944beda341bed1f0efc531b8856ffb267deba

          SHA512

          67827a55b340a40ac7c6ebfd7393a19a3ff510730a2dcd64996320a3d56a2be9653ecc8bc5ab1144c6d178bef7b73d862d54cc8dc9f6fa4302a1639890813157

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

          Filesize

          344B

          MD5

          3b04f6b63ecee87f18a829c77df67319

          SHA1

          674398be75b8a4ba0473ce5645bdecec65343d02

          SHA256

          4368f087601a9d00e5cf6f224e35bdd627195b20090079bec31b3cec4e53c411

          SHA512

          b73616cef149fabe4f5ef9e14f23de813934020a50494457a39cddcda5aa267012aee90b0fcab2931e96570e16d518278d9d8d5c9b432580d32ac0d5b65a2f2e

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

          Filesize

          344B

          MD5

          44c1d66c617798cdc0c2307951fc7afe

          SHA1

          3150a9011b022330e16034442b4a4c3c1c0975a0

          SHA256

          1356e292224643e230f9e863357e4edbf5cbd23b4d806d3a0cc2d826eb54677d

          SHA512

          10a7d0a0340ba4865253ef0155b6cf9aecbfe902218fdf22aa74042d32f632e57467635d7cb5503d95754f74983a0c96cbbaa8d45922f0f99d5c4564e754f861

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

          Filesize

          344B

          MD5

          9ce77531a8400972967d5278e33e0234

          SHA1

          4d0cc5895a538bbad5d22d382884ad42500d5f3c

          SHA256

          a2d00ccb7cb2841a3affa00cf7b781b61dc98168974744bb3081a21dfe99b259

          SHA512

          5518d9f37b0f4ad9f4f233f05ccf8f59d76feaa7c4c1c1726eb7cf4f0515cd7b3d7e97d08434afe0ea0c5b198e579b7f7471f61b2640a7723229ca53b5af0e13

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

          Filesize

          344B

          MD5

          53be8f9373ab9ecf80a281d6dd96dec4

          SHA1

          9c8ed66182e56988f053faafabc70563ab4c5668

          SHA256

          8734ce08e5005e9ed4f35b2c05a202a7a1f0de03143cfcf5d3b4e1d95b0b13a4

          SHA512

          18af044a17af365c5e3e8816c50243ca69b79db5fde70bae34a5a1eeb3d24f813626e31e6e10ffce7bc110f6d2770ef1b2ebf409423d37311745cb52bf6a0e1d

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

          Filesize

          344B

          MD5

          7076ea03f1598453b5bfd034be2938c9

          SHA1

          a0e1e3fde6697e692475d6b64e0d308660dd7249

          SHA256

          eb15e5ae9ce875932e019b5ef68118a3412e25955456d8d7a9e2e13432d24ad5

          SHA512

          0bd4ebb22e11ceedd38d9849dc107b4211970e459b4b3f2392e1aafd497d58e5c61c54f0a5e11135f8889620b8e7429ff07b704c68fd2a550c85379a2dc65ebb

        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

          Filesize

          339KB

          MD5

          1cab66a5c15f97f040fb23d354d04a9c

          SHA1

          f0dbebd22b2c7bfedbefa4435b345c58416f9448

          SHA256

          d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

          SHA512

          a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

        • C:\Users\Admin\AppData\Local\Temp\Cab3881.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Cab3967.tmp

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

        • C:\Users\Admin\AppData\Local\Temp\Tar3884.tmp

          Filesize

          171KB

          MD5

          9c0c641c06238516f27941aa1166d427

          SHA1

          64cd549fb8cf014fcd9312aa7a5b023847b6c977

          SHA256

          4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f

          SHA512

          936ed0c0b0a7ff8e606b1cc4175a1f9b3699748ccbba1c3aff96203033d2e9edabf090e5148370df42fbfc4e31d7229493706ff24f19ff42ff7bef74a6baad06

        • C:\Users\Admin\AppData\Local\Temp\Tar39AB.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\lcybndk48g\port.dat

          Filesize

          4B

          MD5

          598a90004bace6540f0e2230bdc47c09

          SHA1

          301560ebe21439685b64e4381373ef65741df19b

          SHA256

          00476816e43cf2efffdabdda7f55c5203bc9e28382c551f83931de02fd364a25

          SHA512

          e583a61b147e2d349d11ab07f097b7c46605c162a869ad2488ea634d2e43ba1ad732d3a457b0390b3df04c95fb3af75a4e97974e22913080edae1857f1f6ceb3

        • memory/488-506-0x000000001B3D0000-0x000000001B450000-memory.dmp

          Filesize

          512KB

        • memory/488-576-0x000000001B3D0000-0x000000001B450000-memory.dmp

          Filesize

          512KB

        • memory/488-575-0x000007FEF48E0000-0x000007FEF52CC000-memory.dmp

          Filesize

          9.9MB

        • memory/488-505-0x000007FEF48E0000-0x000007FEF52CC000-memory.dmp

          Filesize

          9.9MB

        • memory/2636-9-0x0000000000E70000-0x0000000000ECC000-memory.dmp

          Filesize

          368KB

        • memory/2636-11-0x000000001B350000-0x000000001B3D0000-memory.dmp

          Filesize

          512KB

        • memory/2636-574-0x000000001B350000-0x000000001B3D0000-memory.dmp

          Filesize

          512KB

        • memory/2636-573-0x000007FEF48E0000-0x000007FEF52CC000-memory.dmp

          Filesize

          9.9MB

        • memory/2636-10-0x000007FEF48E0000-0x000007FEF52CC000-memory.dmp

          Filesize

          9.9MB

        • memory/2972-2-0x000000001AC00000-0x000000001AC80000-memory.dmp

          Filesize

          512KB

        • memory/2972-0-0x00000000000C0000-0x000000000011C000-memory.dmp

          Filesize

          368KB

        • memory/2972-1-0x000007FEF52D0000-0x000007FEF5CBC000-memory.dmp

          Filesize

          9.9MB

        • memory/2972-5-0x000007FEF52D0000-0x000007FEF5CBC000-memory.dmp

          Filesize

          9.9MB