Search Evasion Techniques
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Masquerading: Right-to-Left Override Defense Evasion [Mitre]
Adversaries may abuse the right-to-left override (RTLO or RLO) character (U+202E) to disguise a string and/or file name to make it appear benign. RTLO is a non-printing Unicode character that causes the text that follows it to be displayed in reverse. For example, a Windows screensaver executable named March 25 \u202Excod.scr will display as March 25 rcs.docx. A JavaScript file …
Right-to-Left Override (RLO) Extension Spoofing Others
The Right-to-Left Override (RLO) character (U+202E) is a Unicode control character used for bidirectional text formatting. It affects the way text is displayed, causing text following the RLO character to be rendered from right to left, which is typically used in languages like Arabic and Hebrew.
However, malicious actors have found a way to exploit this Unicode character …
Masquerading: Match Legitimate Name or Location Defense Evasion [Mitre]
Adversaries may match or approximate the name or location of legitimate files or resources when naming/placing them. This is done for the sake of evading defenses and observation. This may be done by placing an executable in a commonly trusted directory (ex: under System32) or giving it the name of a legitimate, trusted program (ex: svchost.exe). In containerized environments, this …
File Melt Others
File melting is a technique that malware uses to delete itself after it has been installed on a system. This is often done in order to avoid detection by antivirus programs or other security measures. The process of file melting involves overwriting the file with random data, making it impossible to recover the original file or to detect the presence …
Big File Antivirus/EDR Evasion
Because of the imposed file size limit, you can trick the scanner into skipping a file by changing the file’s size to make it larger than the hard-coded size limit. This file size limit applies especially with heuristic engines based on static data (data extracted from the portable executable, or PE, header). This is an old trick still apply in …