Search Evasion Techniques
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Detecting Window with FindWindow API Anti-Debugging Anti-Monitoring
The FindWindowA / FindWindowW function can be used to search for windows by name or class.
It is also possible to use EnumWindows API in conjunction with GetWindowTextLength and GetWindowText to locate a piece of string that could reveal the presence of a known debugger.
Some Known Debuggers
- ImmunityDebugger
- OllyDbg
- IDA
- x64dbg / …
Detecting Running Process: EnumProcess API Sandbox Evasion Anti-Debugging Anti-Monitoring
Anti-monitoring is a technique used by malware to prevent security professionals from detecting and analyzing it. One way that malware can accomplish this is by using the EnumProcess function to search for specific processes, such as ollydbg.exe or wireshark.exe, which are commonly used by security professionals to monitor and analyze running processes on a system.
By detecting these processes …
API Obfuscation Anti-Disassembly
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 …
API Hammering Sandbox Evasion
API hammering is a technique used to delay sandbox analysis and thus avoid malware capability analysis reporting. This technique consists of calling a large amount of benign APIs like "printf" in a loop.
DNS API Injection Process Manipulating
DNS API injection is a technique used by malware to evade detection by intercepting and modifying DNS (Domain Name System) requests made by a host system. The technique involves injecting code into the DNS API (Application Programming Interface) of the host system, which is a set of functions and protocols that allow communication with the DNS service. By injecting code …
Windows Event Log Evasion via Native APIs Anti-Forensic
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 …
Obfuscated Files or Information: Dynamic API Resolution Defense Evasion [Mitre]
Adversaries may obfuscate then dynamically resolve API functions called by their malware in order to conceal malicious functionalities and impair defensive analysis. Malware commonly uses various Native API functions provided by the OS to perform various tasks such as those involving processes, files, and other system artifacts.
API functions called by malware may leave static artifacts such as strings …
ConsoleWindowClass Process Manipulating
One method that has been used to achieve process injection is by manipulating the User Data of a window object.
The User Data of a window is a small amount of memory that is usually used to store a pointer to a class object. This memory can be set using the SetWindowLongPtr API and the GWLP_USERDATA parameter. In the …
Execution Guardrails: Environmental Keying Defense Evasion [Mitre]
Adversaries may environmentally key payloads or other features of malware to evade defenses and constraint execution to a specific target environment. Environmental keying uses cryptography to constrain execution or actions based on adversary supplied environment specific conditions that are expected to be present on the target. Environmental keying is an implementation of Execution Guardrails that utilizes cryptographic techniques for deriving …
Access Token Manipulation: Parent PID Spoofing Process Manipulating Defense Evasion [Mitre]
Adversaries may spoof the parent process identifier (PPID) of a new process to evade process-monitoring defenses or to elevate privileges. New processes are typically spawned directly from their parent, or calling, process unless explicitly specified.
One way of explicitly assigning the PPID of a new process is via the CreateProcess API call, which supports a parameter that defines the …