The challenge used in this post belongs to incident-response-challenge.In Image File Execution Options, we notice the value name GloabalFlag existsĪnd under SilentProcessExit key, and notepad.exe subkey, we notice the monitoring process is an executable under temp directory which will run whenever a silent exit occurs for notepad.exe The bugger API serves as an alternate transport for Chromes remote debugging protocol. System Regsitry hives are in C:\Windows\System32\config, we’ll only parse Software registry hive We’ll check both registry keys that we have mentioned using Registry Explorer as the evidence mentions Global Flags in the provided evidence This challenge tells an occasional popup for CMD happens which seems to be a persistence pattern. Used tools here will be Registry Explorer to navigate through the registry keys Let’s check 7th medium challenge (Universal) in () website and try to solve it. Now every silent exit of notepad.exe will trigger calc.exe to be run. MonitorProcess value to be calc.exe, and ReportingMode to 1, We’ll create SilentProcessExit key under CurrentVersion, and under this key we’ll add subkey named notepad.exe We’ll run calc.exe once notepad.exe is silently exiting.įirst, we’ll enable silent process exit monitoring by adding GlobalFlag name with hexadecimal value of 200 in notepad.exe key under IFEO key HKLM\Software\Microsoft\Windows NT\CurrentVersion\SilentProcessExit This can be set in the following registry key When a process is created, a debugger present in an application’s IFEO will be prepended to the application’s name, effectively launching the new process under the debugger (e.g., C:dbgntsd.exe -g notepad.exe). Silent exit for an application means the application has been terminated in one of two ways Self termination by calling ExitProcess Another process terminates the monitored process by calling TerminateProcess IFEOs enable a developer to attach a debugger to an application. Launch a process/program when another application silently exits The following example tells the debugger for notepad.exe will be calc.exeĪs below, Debugger is now calc.exe, whenever notepad.exe is set to be executed, the debugger “calc” will be run ProcessName is a registry key that has the name of the process we would like to attach a debugger to it. HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ This allows to run the debugger/application at the time of running the application we wish to debug.Ĭreate a debugger to a process in this registry key IFEO is a feature which lets developers attach a debugger to an application/process. What is Image File Execution Options (IFEO)?
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