Analysis

  • max time kernel
    103s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7v200722
  • submitted
    02/09/2020, 13:25

General

  • Target
    DIL-Statement Overdues & Listed Invoice-August 2020.exe
  • Size 518KB
  • Sample200902-3bhdsaw8ee
  • SHA256 fd5a7b200d38d962d9dc74639994bb1ecf989ecc189a5c2d06bc5196120f4ea5
  • MD5 SHA1 SHA512
Score
7/10

Malware Config

Signatures

  • Loads dropped DLL 6 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • JavaScript code in executable 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Modifies registry key 1 TTPs 3 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious use of WriteProcessMemory 511 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\DIL-Statement Overdues & Listed Invoice-August 2020.exe
    "C:\Users\Admin\AppData\Local\Temp\DIL-Statement Overdues & Listed Invoice-August 2020.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:628
    • C:\Windows\SysWOW64\Notepad.exe
      "C:\Windows\System32\Notepad.exe"
      2⤵
        PID:1920
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c C:\Users\Public\Natso.bat
          3⤵
            PID:1084
            • C:\Windows\SysWOW64\reg.exe
              reg delete hkcu\Environment /v windir /f
              4⤵
              • Modifies registry key
              PID:1832
            • C:\Windows\SysWOW64\reg.exe
              reg add hkcu\Environment /v windir /d "cmd /c start /min C:\Users\Public\x.bat reg delete hkcu\Environment /v windir /f && REM "
              4⤵
              • Modifies registry key
              PID:1564
            • C:\Windows\SysWOW64\schtasks.exe
              schtasks /Run /TN \Microsoft\Windows\DiskCleanup\SilentCleanup /I
              4⤵
                PID:1912
              • C:\Windows\SysWOW64\reg.exe
                reg delete hkcu\Environment /v windir /f
                4⤵
                • Modifies registry key
                PID:288
            • C:\Windows\SysWOW64\cmd.exe
              cmd /c C:\Users\Public\Natso.bat
              3⤵
                PID:1144
            • C:\Program Files (x86)\internet explorer\ieinstal.exe
              "C:\Program Files (x86)\internet explorer\ieinstal.exe"
              2⤵
              • Loads dropped DLL
              PID:436

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                memory/436-248-0x0000000000400000-0x0000000000554000-memory.dmp

                memory/436-250-0x0000000000400000-0x0000000000554000-memory.dmp

                memory/628-242-0x0000000050480000-0x000000005049A000-memory.dmp

                memory/628-0-0x0000000003C10000-0x0000000003C65000-memory.dmp

                memory/1920-4-0x0000000000120000-0x0000000000121000-memory.dmp

                memory/1920-2-0x00000000000E0000-0x00000000000E1000-memory.dmp

                memory/1920-243-0x0000000003C80000-0x0000000003C81000-memory.dmp