Reading That Condition
$mz at 0—- file starts withMZ(a PE).filesize < 500KB—- cheap early filter; skip big files.$api and 2 of ($s1, $s2, $hex)—- must import-look-like injection and match at least two of the family markers.- Combining a cheap anchor with specific markers keeps rules fast and low false-positive.
Key Takeaway
Good conditions balance specific (few false positives) with general (catches variants).