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Disabling Antivirus
Some forms of malware are programmed to disable antivirus software and evade detection by security measures. These malicious programs can use specific commands or techniques to undermine the antivirus software's effectiveness and remain hidden from detection..
Read moreShortcut Hiding
Windows shortcut can be used to store code that downloads a malicious file from the internet, or that stores the malicious file directly within the shortcut itself. This can make it difficult for antivirus software to detect the malicious application, as the file is not stored in a typical location on the computer. Additionally, the use of a shortcut can …
Read moreWiping or Encrypting
Anti-forensic techniques are methods used by malware to prevent security professionals from detecting and analyzing it. One way that malware can accomplish this is by using wiping or encryption techniques to remove its own trace from the system.
In some cases, malware may use wiping or encryption as a decoy, in order to distract security professionals and hide its …
Read moreProcess Injection: Process Doppelgänging
![Defense Evasion [Mitre] icon](/media/2024/04/08/icons8-burglar.svg){kind=small}
Adversaries may inject malicious code into process via process doppelgänging in order to evade process-based defenses as well as possibly elevate privileges. Process doppelgänging is a method of executing arbitrary code in the address space of a separate live process.
Windows Transactional NTFS (TxF) was introduced in Vista as a method to perform safe file operations. To ensure data …
Read moreProcess Injection: ListPlanting
Adversaries may abuse list-view controls to inject malicious code into hijacked processes in order to evade process-based defenses as well as possibly elevate privileges. ListPlanting is a method of executing arbitrary code in the address space of a separate live process. Code executed via ListPlanting may also evade detection from security products since the execution is masked under a legitimate …
Read moreBad String Format
Bad string format is a technique used by malware to evade detection and analysis by OllyDbg, a popular debugger used by security researchers and analysts. This technique involves using malformed strings that exploit a known bug in OllyDbg, causing the debugger to crash or behave unexpectedly.
For example, the malware may use a string with multiple %s inputs, which …
Read morePerforming Code Checksum
Adversaries may use code checksumming to detect if their code has been modified or tampered with. This technique involves calculating a checksum or hash of the code, storing it, and then periodically checking the current checksum against the stored one. If the checksums do not match, it indicates that the code has been modified and the adversary's code can take …
Read moreInterrupts
Adversaries may use exception-based anti-debugging techniques to detect whether their code is being executed in a debugger. These techniques rely on the fact that most debuggers will trap exceptions and not immediately pass them to the process being debugged for handling.
By triggering an exception and checking whether it is handled properly, the adversary's code can determine whether it …
Read moreProcess Hollowing, RunPE
Process hollowing is a technique used by malware to evade detection by injecting malicious code into a legitimate process. This technique involves creating a new instance of a legitimate process and replacing its original code with the malicious payload.
The process is the following:
CreateProcess: in a suspended mode with the CreationFlag at 0x0000 0004.…
Process Camouflage, Masquerading
Masquerading is a technique used by malware to evade detection by disguising itself as a legitimate file. This is typically achieved by renaming the malicious file to match the name of a commonly found and trusted file, such as svchost.exe, and placing it in a legitimate folder.
Masquerading can occur when the name or location of an executable, …
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