Analysis

  • max time kernel
    122s
  • max time network
    133s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    13-09-2023 11:19

General

  • Target

    Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

  • Size

    289KB

  • MD5

    88cfc2ccc0575567122d1d233f9eb1c3

  • SHA1

    4be67d0d801197f88c14d62f4495f17e89fc471f

  • SHA256

    41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4

  • SHA512

    a2dd9ab7a2fe2a6d596c78394f65956f3e8973940229b305e2d763be69ff9f27b1450b5e08ca57cd0886a873fb663daad20ca94d9262a6c80a582dfc5f2e42b7

  • SSDEEP

    6144:uHClm6SWPoK5Z0EwVSmRPQp+L5v9bbSUpi:uHCnZxb8hLLSUpi

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 6 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\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
    "C:\Users\Admin\AppData\Local\Temp\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2356
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "Xd2c386a3a6edfe99de10f6ce6b3659c4809a" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2312
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2700
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2716
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "Xd2c386a3a6edfe99de10f6ce6b3659c4809a" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2988
        • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
          "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1212
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1212 -s 2508
            4⤵
            • Program crash
            PID:2040
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {68CFDAFE-718F-4246-8740-865584944447} S-1-5-21-3849525425-30183055-657688904-1000:KGPMNUDG\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:548
      • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
        C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
        2⤵
        • Executes dropped EXE
        • Accesses Microsoft Outlook profiles
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • outlook_office_path
        • outlook_win_path
        PID:2184
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2184 -s 700
          3⤵
          • Program crash
          PID:2452

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      344B

      MD5

      628d43fa35b8fbed1c5e59bc4d4dda79

      SHA1

      d144cf07bb653a04fecc5bddbc8a91a925e80bac

      SHA256

      cd21e2e25989bbeca8f90db89b4889cce58cd45ffa9577325632a1b6a00e080c

      SHA512

      61436fcf74352434dabbffd844627fbaf3036f6d6e4ccf4dc5b274bdfd66b7495d46b2cdb9bcf5fc4aef5593ca29bc74bb50645be15e52c3bf019ba5a86517ef

    • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

      Filesize

      289KB

      MD5

      88cfc2ccc0575567122d1d233f9eb1c3

      SHA1

      4be67d0d801197f88c14d62f4495f17e89fc471f

      SHA256

      41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4

      SHA512

      a2dd9ab7a2fe2a6d596c78394f65956f3e8973940229b305e2d763be69ff9f27b1450b5e08ca57cd0886a873fb663daad20ca94d9262a6c80a582dfc5f2e42b7

    • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

      Filesize

      289KB

      MD5

      88cfc2ccc0575567122d1d233f9eb1c3

      SHA1

      4be67d0d801197f88c14d62f4495f17e89fc471f

      SHA256

      41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4

      SHA512

      a2dd9ab7a2fe2a6d596c78394f65956f3e8973940229b305e2d763be69ff9f27b1450b5e08ca57cd0886a873fb663daad20ca94d9262a6c80a582dfc5f2e42b7

    • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

      Filesize

      289KB

      MD5

      88cfc2ccc0575567122d1d233f9eb1c3

      SHA1

      4be67d0d801197f88c14d62f4495f17e89fc471f

      SHA256

      41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4

      SHA512

      a2dd9ab7a2fe2a6d596c78394f65956f3e8973940229b305e2d763be69ff9f27b1450b5e08ca57cd0886a873fb663daad20ca94d9262a6c80a582dfc5f2e42b7

    • C:\Users\Admin\AppData\Local\Temp\Cab4D29.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar4D3C.tmp

      Filesize

      163KB

      MD5

      9441737383d21192400eca82fda910ec

      SHA1

      725e0d606a4fc9ba44aa8ffde65bed15e65367e4

      SHA256

      bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

      SHA512

      7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

    • C:\Users\Admin\AppData\Local\xdh16uwiax\port.dat

      Filesize

      4B

      MD5

      4b7a55505729b7f664e7222960e9c2d5

      SHA1

      87920921c770b54d62fd553645a7fc579e1a9a7f

      SHA256

      cdd17cd0ba8b0ae28b6674eb62f8a5a3f0c311aac2b73b82f1eebaaf57cc1179

      SHA512

      60b98cc52594c056367b8d11285d882d2547590652572cd7fa81de218fc7aca77f49ce908e4d4820df1f794db122860c4dbcca0736fbb1d0431e9900bd7b584c

    • memory/1212-10-0x000007FEF49B0000-0x000007FEF539C000-memory.dmp

      Filesize

      9.9MB

    • memory/1212-11-0x000000001B010000-0x000000001B090000-memory.dmp

      Filesize

      512KB

    • memory/1212-9-0x0000000000010000-0x000000000005E000-memory.dmp

      Filesize

      312KB

    • memory/1212-88-0x000007FEF49B0000-0x000007FEF539C000-memory.dmp

      Filesize

      9.9MB

    • memory/1212-89-0x000000001B010000-0x000000001B090000-memory.dmp

      Filesize

      512KB

    • memory/2184-91-0x000007FEF49B0000-0x000007FEF539C000-memory.dmp

      Filesize

      9.9MB

    • memory/2184-111-0x000007FEF49B0000-0x000007FEF539C000-memory.dmp

      Filesize

      9.9MB

    • memory/2184-112-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB

    • memory/2356-0-0x00000000013A0000-0x00000000013EE000-memory.dmp

      Filesize

      312KB

    • memory/2356-5-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2356-2-0x000000001B380000-0x000000001B400000-memory.dmp

      Filesize

      512KB

    • memory/2356-1-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

      Filesize

      9.9MB