Search Evasion Techniques
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Obscuring Control Flow Anti-Disassembly
Obscuring control flow is an anti-disassembling technique that involves using methods of flow control that are difficult or impossible for disassemblers and debuggers to follow. This can make it more difficult for analysts to understand the program's behavior and can also make it more difficult for other tools, such as debuggers, to accurately interpret the program.
One example of …
Guard Pages Anti-Debugging
Memory breakpoints are a technique used by malware to detect if a debugger is present. This technique involves setting up a "guard page" in memory, which is a page of memory that is protected by the operating system and cannot be accessed by normal code. If a debugger is present, the malware can use this guard page to detect its …
Injection using Shims Process Manipulating
Microsoft provides Shims to developers mainly for backward compatibility. Shims allow developers to apply fixes to their programs without the need of rewriting code. By leveraging shims, developers can tell the operating system how to handle their application. Shims are essentially a way of hooking into APIs and targeting specific executables. Malware can take advantage of shims to target an …
Indicator Removal: Clear Windows Event Logs Anti-Forensic Defense Evasion [Mitre]
Event logging is a process that records important software and hardware events from various sources and stores them in a centralized location called an event log. This service is commonly used by applications and operating systems to track and troubleshoot issues, and can be a valuable tool for forensic investigations.
Event logs can provide valuable information about the actions …
Process Reimaging Process Manipulating
Process Reimaging is a technique used to evade detection by endpoint security solutions. It is a variation of the Process Hollowing or Process Doppelganging techniques, which are used to execute arbitrary code in the context of another process.
The Windows operating system has inconsistencies in how it determines the locations of process image FILE_OBJECTs, which can impact the ability …
Breaking BaDDEr Process Manipulating
Dynamic Data Exchange (DDE) is a protocol that allows applications to share data with each other. The Dynamic Data Exchange Management Library (DDEML) is a set of functions that facilitate data sharing using the DDE protocol. DDE and DDEML are commonly used in Microsoft Office to enable data to be shared between applications. In October 2017, a vulnerability was discovered …
Killing Windows Event Log Anti-Forensic
Killing the Windows Event Log is a technique used by malware to prevent security professionals from detecting and analyzing it. Svchost.exe is a process that manages services on Windows operating systems.
By grouping multiple services into a single process, Svchost.exe conserves computing resources and reduces resource consumption. However, this also means that Svchost.exe manages the Event Log service, which …
Hide Artifacts: Hidden Files and Directories Defense Evasion [Mitre]
Adversaries may set files and directories to be hidden to evade detection mechanisms. To prevent normal users from accidentally changing special files on a system, most operating systems have the concept of a ‘hidden’ file. These files don’t show up when a user browses the file system with a GUI or when using normal commands on the command line. Users …
Hijack Execution Flow: Path Interception by Search Order Hijacking Defense Evasion [Mitre]
Adversaries may execute their own malicious payloads by hijacking the search order used to load other programs. Because some programs do not call other programs using the full path, adversaries may place their own file in the directory where the calling program is located, causing the operating system to launch their malicious software at the request of the calling program.
…Exploitation for Defense Evasion Defense Evasion [Mitre]
Adversaries may exploit a system or application vulnerability to bypass security features. Exploitation of a software vulnerability occurs when an adversary takes advantage of a programming error in a program, service, or within the operating system software or kernel itself to execute adversary-controlled code. Vulnerabilities may exist in defensive security software that can be used to disable or circumvent them.
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