Analysis

  • max time kernel
    118s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    13-09-2023 16:29

General

  • Target

    B9a5797cb584014f3fede.exe

  • Size

    530KB

  • MD5

    862e7aeb18ba5892f51b5712a213a614

  • SHA1

    99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

  • SHA256

    44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

  • SHA512

    678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

  • SSDEEP

    6144:XHClm6SWPoK5Z0EwVSmRPQd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHd8JyO:XHCnZxb88RatpvnzZjDv7oj19yTNTY

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582

Signatures

  • 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 8 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\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1628
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2640
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2740
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2760
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2508
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1472
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1472 -s 1132
            4⤵
            • Program crash
            PID:2832
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {F5CDC913-BE30-42BB-A222-707239B5C381} S-1-5-21-2180306848-1874213455-4093218721-1000:XEBBURHY\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:2236
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        2⤵
        • Executes dropped EXE
        • Accesses Microsoft Outlook profiles
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • outlook_office_path
        • outlook_win_path
        PID:2264
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2264 -s 3192
          3⤵
          • Program crash
          PID:2000

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      344B

      MD5

      903dd579a3c16a31e65b7f7fff7300fa

      SHA1

      08a3c2408a2d0591555771b1c31bd235226bce76

      SHA256

      505b16985dc84971eaba917db8f9406b8f23d051a7415f6a900a4c2b4952ca18

      SHA512

      74e341696693481fb84be0a079a974f03af7c6d38dbe4e2bff92787f1248e279148c6d954fe04efdf8dfe991b00f3b722ba09b88d8e69e5833eacc5a8faced6d

    • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

      Filesize

      530KB

      MD5

      862e7aeb18ba5892f51b5712a213a614

      SHA1

      99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

      SHA256

      44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

      SHA512

      678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

    • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

      Filesize

      530KB

      MD5

      862e7aeb18ba5892f51b5712a213a614

      SHA1

      99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

      SHA256

      44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

      SHA512

      678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

    • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

      Filesize

      530KB

      MD5

      862e7aeb18ba5892f51b5712a213a614

      SHA1

      99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

      SHA256

      44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

      SHA512

      678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

    • C:\Users\Admin\AppData\Local\Temp\Cab55A2.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar55E3.tmp

      Filesize

      163KB

      MD5

      9441737383d21192400eca82fda910ec

      SHA1

      725e0d606a4fc9ba44aa8ffde65bed15e65367e4

      SHA256

      bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

      SHA512

      7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

    • C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat

      Filesize

      4B

      MD5

      8a0cd50ecce34cfd150d3d512ccf42cf

      SHA1

      dd44a7e0c789baf2c33278b65a8d82359863658c

      SHA256

      b8efa9f64b3e6e239999946db7be898ddf0b428b568eddb804447bfa39dd4568

      SHA512

      5ce3ca00ae8b2130cf0a02c1c6dce4747d8ad21eabd7afeaa5098e2bfee5a9776f41d347fceb89b70400061d8dd9e76fa6b3407455ebde0632e933d4564d43b2

    • memory/1472-10-0x000007FEF4BB0000-0x000007FEF559C000-memory.dmp

      Filesize

      9.9MB

    • memory/1472-11-0x000000001B460000-0x000000001B4E0000-memory.dmp

      Filesize

      512KB

    • memory/1472-9-0x0000000000BB0000-0x0000000000C3A000-memory.dmp

      Filesize

      552KB

    • memory/1472-81-0x000007FEF4BB0000-0x000007FEF559C000-memory.dmp

      Filesize

      9.9MB

    • memory/1628-5-0x000007FEF55A0000-0x000007FEF5F8C000-memory.dmp

      Filesize

      9.9MB

    • memory/1628-0-0x0000000000120000-0x00000000001AA000-memory.dmp

      Filesize

      552KB

    • memory/1628-2-0x0000000000350000-0x00000000003D0000-memory.dmp

      Filesize

      512KB

    • memory/1628-1-0x000007FEF55A0000-0x000007FEF5F8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2264-83-0x000007FEF4BB0000-0x000007FEF559C000-memory.dmp

      Filesize

      9.9MB

    • memory/2264-110-0x000007FEF4BB0000-0x000007FEF559C000-memory.dmp

      Filesize

      9.9MB

    • memory/2264-111-0x000000001B4A0000-0x000000001B520000-memory.dmp

      Filesize

      512KB