A blocking-scanning manager (101) detects (200) attempted malicious behavior of running code (120). In response to detection, the blocking-scanning manager (101) blocks (206) the attempted malicious behavior. The blocking-scanning manager (101) generates (208) a signature to identify the code that attempted the malicious behavior. The blocking-scanning manager (101) detects (506) code identified by the signature. Responsive to detection, the blocking-scanning manager (101) blocks (508) execution of the identified code (122).