Search Evasion Techniques
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Indicator Removal: Network Share Connection Removal Defense Evasion [Mitre]
Adversaries may remove share connections that are no longer useful in order to clean up traces of their operation. Windows shared drive and SMB/Windows Admin Shares connections can be removed when no longer needed. Net is an example utility that can be used to remove network share connections with the net use \system\share /delete command.
IsDebuggerPresent Anti-Debugging
This function checks specific flag in the Process Environment Block (PEB) for the field IsDebugged which will return zero if the process is not running into a debugger or a nonzero if a debugger is attached.
If you want to understand the underlying process of IsDebuggerPresent API you can check the code snippet section for the following method: IsDebugged Flag …
NtSetInformationThread Anti-Debugging
NtSetInformationThread can be used to hide threads from debuggers using the ThreadHideFromDebugger ThreadInfoClass (0x11 / 17). This is intended to be used by an external process, but any thread can use it on itself.
After the thread is hidden from the debugger, it will continue running but the debugger won’t receive events related to this thread. This thread …