Analysis

  • max time kernel
    117s
  • max time network
    132s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    14-09-2023 05:54

General

  • Target

    I63f8affb2294c837814c33f5446924ba.exe

  • Size

    89KB

  • MD5

    dfb3936eb972928af9ec106505364786

  • SHA1

    06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

  • SHA256

    2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

  • SHA512

    e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

  • SSDEEP

    1536:/JVNAuC4/P1xAqm9wRC+IWMVYJGOupb1cus6SQsjhp5cNbMQaZ9bqk4gxmsuZmQ+:fN//HAqm9wRC+IWMVYJGOubXsjL5wvsD

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 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\I63f8affb2294c837814c33f5446924ba.exe
    "C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3016
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\I63f8affb2294c837814c33f5446924ba.exe" &&START "" "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1664
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2636
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2500
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "I63f8affb2294c837814c33f5446924ba" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2520
        • C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe
          "C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.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:2468
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2468 -s 3048
            4⤵
            • Program crash
            PID:928
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {A9280A71-3820-4FA6-AC7C-5E96F04BAEC3} S-1-5-21-2180306848-1874213455-4093218721-1000:XEBBURHY\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:2004
      • C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe
        C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.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:2880
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2880 -s 3108
          3⤵
          • Program crash
          PID:1884

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      344B

      MD5

      2fdf523d06d257380477ff63bd62b72c

      SHA1

      0051832b2902b10f053ba4cf215a5b6c361af6f2

      SHA256

      593a7d7306e41edd6bb2a305d1fb7450d9772561e0100bc012e938cc1cfd0b5c

      SHA512

      de690ea11cdf4723b2dd49a7ed9751bb63f471fdb0e4bd4f26d4d4576b5de244808ce88a72e4179c6f85154a9a6a3cd4b23bbeee2c5436872c82c73556e08a86

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

      Filesize

      344B

      MD5

      46b84581f58b334af1e48e90d9ba1e07

      SHA1

      74584ff0464724dd00f7d46f12bb88eed2db0472

      SHA256

      d4321fe9176fca54d5ee2026d8a60526b3b233aa0bfe12f80c317b70475c99b2

      SHA512

      a18ebfa036abd0a4468ae7956bfd2e18451fe07ac79201ebcbe7227754f95d50e419778efa6c45c8064c5c3b23c867cb58c6953ab150c890ee599ccfbb3bf507

    • C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe

      Filesize

      89KB

      MD5

      dfb3936eb972928af9ec106505364786

      SHA1

      06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

      SHA256

      2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

      SHA512

      e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

    • C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe

      Filesize

      89KB

      MD5

      dfb3936eb972928af9ec106505364786

      SHA1

      06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

      SHA256

      2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

      SHA512

      e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

    • C:\Users\Admin\AppData\Local\EsetSecurity\I63f8affb2294c837814c33f5446924ba.exe

      Filesize

      89KB

      MD5

      dfb3936eb972928af9ec106505364786

      SHA1

      06a05bf8d2675ea58e44d3fdc0d9e610be021ca8

      SHA256

      2d1765fd2323db0b7a1b2a4413f793bb6b3a544ed7ba19c1b0d9c4db80747a93

      SHA512

      e71c24d1804792be45281e70e97d909817e18d0948dcaf86b3e49d22d9f085278b8d043613f1fee0468a28f9e10218ac2cce3315e4c1575f242b324f606e950f

    • C:\Users\Admin\AppData\Local\Temp\Cab5286.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar5335.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

    • C:\Users\Admin\AppData\Local\jdm9hu6p1h\port.dat

      Filesize

      4B

      MD5

      e3ea33961a7c5b1ec04d6c97aa3b5379

      SHA1

      a51a0312093b0b280af66804ff464d5003d762aa

      SHA256

      ee43ec7cc83b9a0fe422f2b26a3ad983c9ca579ca7bce87d07d971642d9c50eb

      SHA512

      18d2570d9ac78946175cdcfb6e106677898ee6f94a9eb412a302192cdf45967ce0887c95d92e89d64af9f667c91d0c94b600675c23d0e34dac959ae5b3fb4076

    • memory/2468-10-0x000007FEF4B10000-0x000007FEF54FC000-memory.dmp

      Filesize

      9.9MB

    • memory/2468-11-0x000000001AB10000-0x000000001AB90000-memory.dmp

      Filesize

      512KB

    • memory/2468-9-0x0000000000030000-0x000000000004C000-memory.dmp

      Filesize

      112KB

    • memory/2468-76-0x000007FEF4B10000-0x000007FEF54FC000-memory.dmp

      Filesize

      9.9MB

    • memory/2468-77-0x000000001AB10000-0x000000001AB90000-memory.dmp

      Filesize

      512KB

    • memory/2880-80-0x0000000002210000-0x0000000002290000-memory.dmp

      Filesize

      512KB

    • memory/2880-79-0x000007FEF4B10000-0x000007FEF54FC000-memory.dmp

      Filesize

      9.9MB

    • memory/2880-102-0x000007FEF4B10000-0x000007FEF54FC000-memory.dmp

      Filesize

      9.9MB

    • memory/3016-2-0x000000001B1D0000-0x000000001B250000-memory.dmp

      Filesize

      512KB

    • memory/3016-5-0x000007FEF5500000-0x000007FEF5EEC000-memory.dmp

      Filesize

      9.9MB

    • memory/3016-1-0x000007FEF5500000-0x000007FEF5EEC000-memory.dmp

      Filesize

      9.9MB

    • memory/3016-0-0x0000000000AE0000-0x0000000000AFC000-memory.dmp

      Filesize

      112KB