Analysis

  • max time kernel
    120s
  • 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 5 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 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).

  • 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 4 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:2056
    • 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:1692
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2140
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2280
        • 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:2768
        • 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:2932
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2932 -s 3060
            4⤵
            • Program crash
            PID:1460
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {5D8EB511-77CD-44A5-9645-71388058095C} S-1-5-21-2180306848-1874213455-4093218721-1000:XEBBURHY\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:2612
      • 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:2928
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2928 -s 3136
          3⤵
          • Program crash
          PID:2200

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      344B

      MD5

      76f00ac285f258782317be0e8d041c84

      SHA1

      cb6eac17017671666baa6e8f5f79d8256b666c69

      SHA256

      2c761b18173d939b777dc7b65768bc14241269e2c64c91aeec418030edc99c1e

      SHA512

      b298c1b933b1d202fa56297fa3bd9085f24701e9e5a2270ee48ecc1729ed94225293cc39e631f53a4af375c0e8102ccf2bf19ebdbd33a1906abe0dcf74d37c7e

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

      Filesize

      344B

      MD5

      b2da9236aae5ad538a5f0338bdaf76bc

      SHA1

      48bbae732d72524a287a93350c07525c1c534966

      SHA256

      04ce788de210bc919c18fbdbb12dccd9624c5240e3a898b6f0d16aca4e1ffb5c

      SHA512

      97cbd8fcb1a2dd70dc557f047d9e299e508c9f490e060bcf1fd3a2397cc2b850ae8a3a7184278db087468dbd371b342412829e55d19e88c27aa15b95339aa455

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

      Filesize

      4B

      MD5

      33b9c7c18ec3acc3747c41e70e9bb3d6

      SHA1

      fce7b95fb26969af8afd58102677dd04da9a9f09

      SHA256

      a818957b3a1f9857b721ff8ff9127e971302607b483b24a8d7b82ca8c2edff35

      SHA512

      dc242acec23a862f7672d0637926897e19d108ce568e7e0b2effbb4baa5a611f9c89e2386c7d5913c8f876fc60266846c2d6c1d98d9cf50738d013fb49d1b6df

    • 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\Cab53ED.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar5509.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/2056-0-0x0000000001190000-0x00000000011B4000-memory.dmp

      Filesize

      144KB

    • memory/2056-5-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

      Filesize

      9.9MB

    • memory/2056-2-0x000000001ACE0000-0x000000001AD60000-memory.dmp

      Filesize

      512KB

    • memory/2056-1-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

      Filesize

      9.9MB

    • memory/2928-89-0x000007FEF4B90000-0x000007FEF557C000-memory.dmp

      Filesize

      9.9MB

    • memory/2928-90-0x000000001B1D0000-0x000000001B250000-memory.dmp

      Filesize

      512KB

    • memory/2928-111-0x000007FEF4B90000-0x000007FEF557C000-memory.dmp

      Filesize

      9.9MB

    • memory/2932-11-0x000000001B2F0000-0x000000001B370000-memory.dmp

      Filesize

      512KB

    • memory/2932-10-0x000007FEF4B90000-0x000007FEF557C000-memory.dmp

      Filesize

      9.9MB

    • memory/2932-9-0x0000000001300000-0x0000000001324000-memory.dmp

      Filesize

      144KB

    • memory/2932-86-0x000007FEF4B90000-0x000007FEF557C000-memory.dmp

      Filesize

      9.9MB