Search For Content
Search Result
15 item(s) found so far for this keyword.
Domain Member
This technique determines if a host is a member of an Active Directory Domain without API calls. It helps prevent malicious payload execution in enterprise sandboxes that are not members of an Active Directory domain. The validation is done by checking the "LoggonServer" and "ComputerName" environment variables. If the host is logged into a domain controller, the "LoggonServer" value will …
Read moreProcess Injection: Dynamic-link Library Injection
![Defense Evasion [Mitre] icon](/media/2024/04/08/icons8-burglar.svg){kind=small}
Adversaries may inject dynamic-link libraries (DLLs) into processes in order to evade process-based defenses as well as possibly elevate privileges. DLL injection is a method of executing arbitrary code in the address space of a separate live process.
DLL injection is commonly performed by writing the path to a DLL in the virtual address space of the target process …
Read moreRootkit
Adversaries may use rootkits to hide the presence of programs, files, network connections, services, drivers, and other system components. Rootkits are programs that hide the existence of malware by intercepting/hooking and modifying operating system API calls that supply system information.
Rootkits or rootkit enabling functionality may reside at the user or kernel level in the operating system or lower, …
Read moreAPI Obfuscation
API obfuscation is a technique used by malware to make it more difficult for security analysts to understand and analyze the code. This is typically done by using a technique called API hashing, which replaces the names of API functions with a hashed value. When an analyst runs the malware through a disassembler tool, the hashed values are printed instead …
Read moreDisabling Event Tracing for Windows (ETW)
Many EDR solutions leverage Event Tracing for Windows (ETW) extensively. ETW allows for extensive instrumentation and tracing of a process functionality and WINAPI calls. It has components in the kernel, to register callbacks for system calls and other kernel operations, but also consists of a userland component that is part of ntdll.dll.
Since ntdll.dll is a DLL loaded into …
Read moreWindows Event Log Evasion via Native APIs
Attackers can leverage native Windows API calls to install malicious services without generating correlating entries in the event log. Using native APIs to install services instead of the standard API calls allow attackers to bypass security controls and event logging. This technique was utilised by Stuxnet.
Services are typically created through a standard Windows API call CreateServiceA or CreateService …
CPU Counting
In many sandboxes, due to virtualization constraints, the number of CPUs may be limited to one. However, in the real world, all x86 CPUs have been sold with multiple cores or at least hyperthreading for over a decade.
As a result, it is sometimes possible to detect virtualization or sandboxing by examining the number of CPUs on the system. …
Read moreProcess Injection: Portable Executable Injection
Adversaries may inject portable executables (PE) into processes in order to evade process-based defenses as well as possibly elevate privileges. PE injection is a method of executing arbitrary code in the address space of a separate live process.
PE injection is commonly performed by copying code (perhaps without a file on disk) into the virtual address space of the …
Read moreProcess Injection: Thread Execution Hijacking
Adversaries may inject malicious code into hijacked processes in order to evade process-based defenses as well as possibly elevate privileges. Thread Execution Hijacking is a method of executing arbitrary code in the address space of a separate live process.
Thread Execution Hijacking is commonly performed by suspending an existing process then unmapping/hollowing its memory, which can then be replaced …
Read moreProcess Injection: Asynchronous Procedure Call
Adversaries may inject malicious code into processes via the asynchronous procedure call (APC) queue in order to evade process-based defenses as well as possibly elevate privileges. APC injection is a method of executing arbitrary code in the address space of a separate live process.
APC injection is commonly performed by attaching malicious code to the APC Queue of a …
Read more