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Code Transposition
Code transposition is a technique used by malware authors to evade detection and analysis by rearranging the instructions of a piece of code without changing its behavior. This technique is used to make the code more difficult to read and understand for disassemblers and reverse engineers, as well as to hide the true intent of the code.
There are …
Read moreOpaque Predicate
Opaque predicate is a term used in programming to refer to decision making where there is only one possible outcome. This can be achieved through the use of complex or hard-to-understand logic, such as calculating a value that will always return True.
Opaque predicates are often used as anti-disassembling techniques, as they can make it difficult for an analyst …
Read moreKill Process
Malware often employs techniques to evade detection and hinder the efforts of security experts in analyzing its behavior. One notable method involves terminating processes associated with anti-virus software or monitoring tools.
For example, malware may specifically target processes like wireshark.exe, ida.exe, or procmon.exe, which are frequently used by analysts to observe and scrutinize running processes on a system. By …
Read moreIndicator Removal: Clear Windows Event Logs
![Defense Evasion [Mitre] icon](/media/2024/04/08/icons8-burglar.svg){kind=small}
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 …
Read moreFast Flux
Fast flux is a technique used by botnets to conceal the location of their phishing and malware delivery sites by using a constantly changing network of compromised hosts as proxies. This makes it difficult for law enforcement and other security actors to track down and shut down the sites, as the IP addresses of the sites are constantly changing.
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Read moreProcess Reimaging
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 …
Read moreChecking Malware Name
Malware can use various techniques to evade detection by security analysts and researchers. One such technique is to check the name of the malware sample before fully executing on the infected machine. If the sample has been renamed to a blacklisted name, such as "malware.exe" or "sample.exe", or even with the file hash, the malware can detect this and change …
Read moreDNS API Injection
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 …
Read moreAnti Yara Rules
Yara rules are used by malware researchers to identify and classify malware based on specific characteristics and behaviors. These rules are powerful because they allow researchers to quickly and accurately detect malware, even if it has been modified to avoid detection. However, attackers can also modify their malware to avoid detection by Yara rules.
This is often seen with …
Read moreExecution Guardrails: Environmental Keying
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 …
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