Problem
Compressed sponsorship assets contain files whose extensions are obscured by misleading filenames.
Solution
Root Cause / Diagnostic:
Threat actors pack compressed archives with deceptive filenames utilizing right-to-left override (RLTO) Unicode characters or excessive spacing (e.g., Asset_Brief_______________________.exe). When unpacked, the visual interface truncates the executable extension, misleading the creator into executing malicious code.
Actionable Fix:
1. Archive Content Inspection via CLI / 7-Zip: Inspect archive contents using 7-Zip or command-line tools to review raw un-truncated file extensions and file properties before extraction.
2. Unicode Spoofing Detection: Deploy endpoint security rules that detect and flag the use of the Right-to-Left Override Unicode character (U+202E) in filenames.
3. Prohibit Archive Execution from Downloads: Block binary execution directly within archive utility temporary extraction directories (%TEMP%\*).
Pro Tip:
Be wary of files in zip folders with super long names or weird blank spaces before the file extension. Hackers use spacing tricks and Unicode characters to hide the fact that a file is actually an .exe file.
Threat actors pack compressed archives with deceptive filenames utilizing right-to-left override (RLTO) Unicode characters or excessive spacing (e.g., Asset_Brief_______________________.exe). When unpacked, the visual interface truncates the executable extension, misleading the creator into executing malicious code.
Actionable Fix:
1. Archive Content Inspection via CLI / 7-Zip: Inspect archive contents using 7-Zip or command-line tools to review raw un-truncated file extensions and file properties before extraction.
2. Unicode Spoofing Detection: Deploy endpoint security rules that detect and flag the use of the Right-to-Left Override Unicode character (U+202E) in filenames.
3. Prohibit Archive Execution from Downloads: Block binary execution directly within archive utility temporary extraction directories (%TEMP%\*).
Pro Tip:
Be wary of files in zip folders with super long names or weird blank spaces before the file extension. Hackers use spacing tricks and Unicode characters to hide the fact that a file is actually an .exe file.