Analysis

  • max time kernel
    121s
  • max time network
    125s
  • 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 6 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 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:3024
    • 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:2768
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2412
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2688
        • 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:2700
        • 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:2668
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2668 -s 3112
            4⤵
            • Program crash
            PID:2904
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {E392EC7D-DD09-4E4D-9E0F-C95512F57B80} S-1-5-21-607259312-1573743425-2763420908-1000:NGTQGRML\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:692
      • 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:564
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 564 -s 3016
          3⤵
          • Program crash
          PID:2288

    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

      01d7f10e8b0db78e4255dd5ebdd2fbef

      SHA1

      813380d6364095c424cc79e0494b94a53085c921

      SHA256

      e4a2c38bcf2c23d5795c65ca42ae0c140274c37f6516180af2f7ecff91c32788

      SHA512

      91eb4b7e212da566b0d79293ebdfb9307412ebc7063db13924eb81beb3f89909805e9a552df8340ccfc02c6a9bd290c2cd84d3e4b8e524c0a08b580d44b76691

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

      Filesize

      344B

      MD5

      570c5df11682880a2d89ea35fe4c8a55

      SHA1

      1a8db316900c69a43adc208b57ebcc6ba5d7b9e1

      SHA256

      6d1261caf8b0abb94c80c8169af4cb7021843f397cb3fc226f3097ce990e2c75

      SHA512

      4998a8cb57552153b02d25c25e7a84cc9589a9fa55c9b07da8140858eb2c09daac4e585930f5e5fa1afe28ac2cbe490f3ab8f7cde398ceaa8f9684285be34146

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

      Filesize

      4B

      MD5

      7c0f63c15f8749d716ba1ac9121cc1a8

      SHA1

      e9685cf33b27028baae03480e332e453ace2abfb

      SHA256

      df33710fdefd14a5117159cb74c10e74d0f403d355a2f29a2a74d17499fbb60f

      SHA512

      c615875186d4d6c82f4f794b93dc5d6d453dd1541f70d52da7fb2ebb320f43988b6053cd3b982b82c96235b965d5118ba85008a0cd6f5e4d56c31c1a242f40e1

    • 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\Cab4203.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar4263.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/564-112-0x000000001B1C0000-0x000000001B240000-memory.dmp

      Filesize

      512KB

    • memory/564-89-0x000007FEF5590000-0x000007FEF5F7C000-memory.dmp

      Filesize

      9.9MB

    • memory/564-111-0x000007FEF5590000-0x000007FEF5F7C000-memory.dmp

      Filesize

      9.9MB

    • memory/2668-9-0x0000000000FA0000-0x0000000000FC4000-memory.dmp

      Filesize

      144KB

    • memory/2668-10-0x000007FEF5590000-0x000007FEF5F7C000-memory.dmp

      Filesize

      9.9MB

    • memory/2668-86-0x000007FEF5590000-0x000007FEF5F7C000-memory.dmp

      Filesize

      9.9MB

    • memory/2668-87-0x000000001ADA0000-0x000000001AE20000-memory.dmp

      Filesize

      512KB

    • memory/2668-11-0x000000001ADA0000-0x000000001AE20000-memory.dmp

      Filesize

      512KB

    • memory/3024-5-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

      Filesize

      9.9MB

    • memory/3024-1-0x000007FEF5F80000-0x000007FEF696C000-memory.dmp

      Filesize

      9.9MB

    • memory/3024-2-0x000000001B290000-0x000000001B310000-memory.dmp

      Filesize

      512KB

    • memory/3024-0-0x0000000000090000-0x00000000000B4000-memory.dmp

      Filesize

      144KB