A right-to-left override (RTLO) attack exploits user confidence in text files by converting the text file extension to a “.exe” executable file. An RTLO attack is a clever phishing technique that fools people into thinking they are accessing an innocuous text file when, in fact, they are launching a dangerous executable. It’s one of the methods ransomware developers use to get their virus onto company machines.
One of the most common attack routes for threat actors is email. Many of the most serious data breaches begin with phishing emails. Phishing emails can be used to mislead users into disclosing sensitive information, such as authentication credentials, or they can be used to trick users into running harmful software. The latter of these two categories is used by an RTLO attack.
One of the most common attack routes for threat actors is email. Many of the most serious data breaches begin with phishing emails. Phishing emails can be used to mislead users into disclosing sensitive information, such as authentication credentials, or they can be used to trick users into running harmful software. The latter of these two categories is used by an RTLO attack.
Malware assaults make use of a variety of executable files. Among the file kinds are:
- .exe
- .bat
- .cmd
- .vbs
- .ps1 (PowerShell)
- .com
Many email clients will prevent RTLO attacks, however zip packages containing malicious executables will go through. Anti-malware software will detect RTLO assaults as well, but users should be educated to examine file extensions and avoid opening files from strangers. Windows, on the other hand, conceals file extensions by default. Windows may be set to display file extensions, which aids in the detection of RTLO attacks.
Because attackers may assign any icon to a file, icons should not be utilized to determine file contents. To display file extensions in Windows Explorer, access the settings window by typing “folder options” in the Windows 10 search textbox. Uncheck the option “Hide extensions for recognized file types” in the Advanced Settings section and click “Ok.” This adjustment takes effect instantly, and the file extension will be shown in Explorer for all files. You may put it to the test by opening any folder and inspecting the files.
Always keep antivirus and antivirus software up to date with the latest patches and updates to help protect computers from infection. If a user is duped into opening the file, anti-malware software will detect many of the typical dangerous executables that endanger enterprise cybersecurity and data protection.
Because RTLO attacks are less widespread and less well-known, system administrators must take the required safeguards to protect user devices. Configure Windows to display file extensions, and utilize email cybersecurity to prevent executable files and dangerous material from being sent.
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