Analysis

  • max time kernel
    154s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/10/2022, 00:33

General

  • Target
    6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7.exe
  • Size 497KB
  • Sample221029-awbegadff4
  • SHA256 6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • ISR Stealer

    ISR Stealer is a modified version of Hackhound Stealer written in visual basic.

  • ISR Stealer payload 1 IoCs
  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7.exe
    "C:\Users\Admin\AppData\Local\Temp\6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3292
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c copy "C:\Users\Admin\AppData\Local\Temp\6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7.exe" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\dnsmon.exe"
      2⤵
        PID:2064
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
        2⤵
          PID:5084
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:5004
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe"
            3⤵
            • Executes dropped EXE
            • Checks computer location settings
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1320
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /c reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows" /v "Load" /d "cmd /c C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe" /f
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:1808
              • C:\Windows\SysWOW64\reg.exe
                reg add "HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows" /v "Load" /d "cmd /c C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe" /f
                5⤵
                  PID:3608
              • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\dnsmon.exe
                "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\dnsmon.exe"
                4⤵
                • Executes dropped EXE
                • Checks computer location settings
                • Suspicious use of SetThreadContext
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:820
                • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
                  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
                  5⤵
                    PID:3328
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\System32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe"
                    5⤵
                    • Suspicious use of WriteProcessMemory
                    PID:2040
                    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
                      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe"
                      6⤵
                      • Executes dropped EXE
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      PID:812

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                natsv.exe.log

                • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\natsv.exe.log
                • Size 128B
                • SHA256 e24033ceec97fd03402b03acaaabd1d1e378e83bb1683afbccac760e00f8ead5
                • MD5 SHA1 SHA512

                dnsmon.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\dnsmon.exe
                • Size 497KB
                • SHA256 6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7
                • MD5 SHA1 SHA512 SSDEEP

                dnsmon.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\dnsmon.exe
                • Size 497KB
                • SHA256 6e540cf9eee4ad60a985bbaa05c31d20e96c33cde02ca2fdedc8893524894ad7
                • MD5 SHA1 SHA512 SSDEEP

                natsv.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
                • Size 24KB
                • SHA256 e1b1dc86ebe7440828efab389cb9edcfd639463a8ff64742818a84859a7ff417
                • MD5 SHA1 SHA512 SSDEEP

                natsv.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
                • Size 24KB
                • SHA256 e1b1dc86ebe7440828efab389cb9edcfd639463a8ff64742818a84859a7ff417
                • MD5 SHA1 SHA512 SSDEEP

                natsv.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
                • Size 24KB
                • SHA256 e1b1dc86ebe7440828efab389cb9edcfd639463a8ff64742818a84859a7ff417
                • MD5 SHA1 SHA512 SSDEEP

                natsv.exe

                • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\natsv.exe
                • Size 24KB
                • SHA256 e1b1dc86ebe7440828efab389cb9edcfd639463a8ff64742818a84859a7ff417
                • MD5 SHA1 SHA512 SSDEEP

                enterprisesec.config.cch

                • Path C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch
                • Size 514B
                • SHA256 d133a6e443c86364b0697f3d0362d336c551e064195043b880df5547ecbf851b
                • MD5 SHA1 SHA512

                security.config.cch

                • Path C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch
                • Size 514B
                • SHA256 d133a6e443c86364b0697f3d0362d336c551e064195043b880df5547ecbf851b
                • MD5 SHA1 SHA512

                memory/812-165-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/812-163-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/820-149-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/820-164-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/1320-150-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/1320-145-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/3292-133-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/3292-132-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/3292-151-0x0000000074A30000-0x0000000074FE1000-memory.dmp

                memory/5084-137-0x0000000000770000-0x00000000007B2000-memory.dmp