Analysis

  • max time kernel
    118s
  • max time network
    124s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    08-09-2023 09:46

General

  • Target

    369204590CE91E77109E21A298753522.exe

  • Size

    119KB

  • MD5

    369204590ce91e77109e21a298753522

  • SHA1

    e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

  • SHA256

    a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

  • SHA512

    bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

  • SSDEEP

    3072:P56Q4BB1q/hJcq4YZRKsySYSLLx9yLjj6TG6WVt9bm+EFyW43LORzMJS/3:Fha6BuQdwLKTGLt9bmhD4q1Mc

Malware Config

Signatures

  • Detect Gurcu Stealer V3 payload 7 IoCs
  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • 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.

  • Program crash 2 IoCs
  • 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 behavior: EnumeratesProcesses 2 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\369204590CE91E77109E21A298753522.exe
    "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1692
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\369204590CE91E77109E21A298753522.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2588
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2660
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2704
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "369204590CE91E77109E21A298753522" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2836
        • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
          "C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2608
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2608 -s 3116
            4⤵
            • Program crash
            PID:1444
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {14D71E3C-0CE5-4569-9B58-7D7DE380F8AE} S-1-5-21-86725733-3001458681-3405935542-1000:ZWKQHIWB\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:824
      • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
        C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe
        2⤵
        • 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:2020
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2020 -s 2884
          3⤵
          • Program crash
          PID:2000

    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

      6c41edc6b0b9217b04eb6d2d5ea3fa10

      SHA1

      336eeb06a8abdf283b2e3b53464d191ac9940bff

      SHA256

      72f848da2c4b38ba8d453e89a8b346452e6c71714c646ba6466078d3a36589de

      SHA512

      7041510c4eb7d8e686851fbbee5a06b4e447e32e5476517e8c566723c20a627c4ff16f2b1d69eb494e91213649eb3da22a9f2521553c893c2debc7cbef311e6b

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

      Filesize

      304B

      MD5

      0988741a70d5aed8bfc8233b892d2205

      SHA1

      cef3fab8d6c9d7a4b5dfe73eaefce77667544b66

      SHA256

      e77c3f3681bcb76094a0cfe70700ad9c58e0bb6f4ca3804dd495e29740896164

      SHA512

      6e9577a29907850a5e91fa93d7d882593dcd1c26025e975273add071741862a71b02f1ec3d6b89f60008d578b021c75a2fbfa2a055835ec819e18061e0d489ff

    • C:\Users\Admin\AppData\Local\84tnjh4449\port.dat

      Filesize

      4B

      MD5

      7695ea769f021803c508817dd374bb27

      SHA1

      33c27df10ca3bacf99aec5e5db8e769963e41fdd

      SHA256

      9d0f9740bf708828641fecffa4c14fa25d195953b513e82203fd62533512d55d

      SHA512

      4f933afd509b9a374275022830b9f7cefa58ae8a87e9df793afab0ee0f99f8deb3348c74c053573b071098682fe0beb6eda56f5a2d8a1f879f3a555f3fc51bff

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\EsetSecurity\369204590CE91E77109E21A298753522.exe

      Filesize

      119KB

      MD5

      369204590ce91e77109e21a298753522

      SHA1

      e981f0c86c42e9e8fcbc7dcff0e05c35887a3869

      SHA256

      a245b51ab711d20b944edca262659dba3a0ee6d1590c8f55a858ce82e2a1c647

      SHA512

      bf4367a692eb1f4c31533ee1391cfc1708c75bf726dd5287ac0fa2e602664fa3a74458ded18c1831db16f0462b202f79b10d0f82f3bcb98423a460002e04cf32

    • C:\Users\Admin\AppData\Local\Temp\Cab849E.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar84DF.tmp

      Filesize

      163KB

      MD5

      9441737383d21192400eca82fda910ec

      SHA1

      725e0d606a4fc9ba44aa8ffde65bed15e65367e4

      SHA256

      bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

      SHA512

      7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

    • C:\Users\Admin\AppData\Local\Temp\installUtilLog.txt

      Filesize

      82B

      MD5

      1d2c0986ba3c3af924ad4b8776a45190

      SHA1

      e4199810598c592fb4304eb37cf90d2ce2065a11

      SHA256

      8f8cc850ea7e227ba100ad943c4c9000857e39d66a0aa6a245f599e6868d04c2

      SHA512

      275f4de2999bc947be2a179aab2ed6e33d7591d3464d3ba43d3ca1b6fc0ada3aae2090f39dc3620bfcfa57824e26aba7b401145137f87115bbd4c3589a291524

    • memory/1692-2-0x000000001B0E0000-0x000000001B160000-memory.dmp

      Filesize

      512KB

    • memory/1692-0-0x0000000000170000-0x0000000000194000-memory.dmp

      Filesize

      144KB

    • memory/1692-5-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

      Filesize

      9.9MB

    • memory/1692-1-0x000007FEF5BD0000-0x000007FEF65BC000-memory.dmp

      Filesize

      9.9MB

    • memory/2020-79-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB

    • memory/2020-80-0x000000001B4A0000-0x000000001B520000-memory.dmp

      Filesize

      512KB

    • memory/2020-102-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB

    • memory/2608-9-0x0000000000940000-0x0000000000964000-memory.dmp

      Filesize

      144KB

    • memory/2608-76-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB

    • memory/2608-77-0x000000001B160000-0x000000001B1E0000-memory.dmp

      Filesize

      512KB

    • memory/2608-11-0x000000001B160000-0x000000001B1E0000-memory.dmp

      Filesize

      512KB

    • memory/2608-10-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB