![]() This has lead red teams and adversaries to use parent PID spoofing as an evasion method. Various EDR’s (endpoint detection and response) can detect this abnormal activity easily. For example if PowerShell is the child process and Microsoft Word is the parent then it is an indication of compromise. Finally, the forEach() call invokes dumpProcessInfo() on each process handle.Ĭompile Listing 3 and run the resulting application.Monitoring the relationships between parent and child processes is very common technique for threat hunting teams to detect malicious activities. (On my platform, the pathname isn't present when the process has terminated.) The limit(4) call yields a truncated stream of no more than four process handles. Main() invokes allProcesses() and chains the resulting process handles stream to a filter that yields a new stream of process handles where a process executable pathname is present. orElse(Duration.ofMillis(0)).toMillis()) Info.startInstant().orElse(Instant.now()).toString()) String args = info.arguments().orElse(new String) Static void dumpProcessInfo(ProcessHandle ph) Process p = new ProcessBuilder("notepad.exe", "C:\\temp Obtaining and outputting process information import java.io.IOException ĭumpProcessInfo(ProcessHandle.current()) Listing 2 presents the source code to an application that dumps this and other information on the current process and another process to the standard output. ProcessHandle.Info defines several methods that return process information, such as the process's executable pathname, the process's start time, and the process's user. In the second case, getPid() continues to return the PID after the process terminates. In the first case, start() throws java.io.IOException. Perhaps you're wondering what happens with getPid() when the process cannot be started or it terminates before this method is called. If you have a ProcessHandle object, you can obtain the PID of its associated process by invoking ProcessHandle's long getPid() method. Here's an example: 9480 Getting the PID from a process handle I observed a new window for notepad.exe along with an unsigned integer that varies from run to run. Run the resulting application as follows: java ProcessDemo ProcessBuilder is a much better alternative.Ĭompile Listing 1 as follows: javac ProcessDemo.java Process's getPid() method is subsequently invoked on the Process object and its value is output.īefore Java 5, the only way to spawn a new process was to use Runtime.getRuntime().exec(). The start() method is invoked to start notepad.exe, returning a Process object to interact with the new process. The class (introduced in Java 5) constructs a process builder for the Windows notepad.exe program. Process p = new ProcessBuilder("notepad.exe").start() Public static void main(String args) throws IOException Obtaining and outputting a PID import java.io.IOException The method's return type is long instead of int because PIDs are unsigned integers, the largest positive int value is around 2 million, and Linux can accommodate PIDs up to around 4 million. Process's long getPid() method returns the PID of the invoking process. You'll learn how to work with these methods along with various ProcessHandle and new Process methods in subsequent sections. The nested Info interface provides the following methods:Įach method returns a instance that may contain a non-null object reference or null, and is useful for avoiding. For example, getPid() invokes toHandle().getPid() and info() invokes toHandle().info(), which returns a ProcessHandle.Info object. Various Process methods delegate to their ProcessHandle counterparts by invoking toHandle() followed by the method name. ![]() ProcessHandle's methods are listed below: For example, toHandle() returns an object whose class implements ProcessHandle, and which is associated with this Process. More than half of these methods work with the new ProcessHandle interface, which identifies and provides control of native processes. Java 9 adds several new methods to the abstract Process class that let you identify direct child or descendent processes, obtain this Process's PID, return a snapshot of information about this Process, obtain a completable future to receive asynchronous notification when this Process exits, and more: ![]() Enhancing Process, and introducing ProcessHandle and ProcessHandle.Info This post introduces you to these upgrades. JEP 102: Process API Updates enhances the class and introduces the interface with its nested Info interface to overcome limitations that often force developers to resort to native code for example, to obtain the native process ID (PID). ![]()
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