UNPACKING FLASH EXPLOITS WITH AN ACTIONSCRIPT EMULATOR
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United States of America Patent
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N/A
Issued Date -
May 1, 2014
app pub date -
Nov 1, 2012
filing date -
Nov 1, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and systems for detecting an attempt to load embedded Flash are provided. According to one embodiment, an ActionScript emulator running on a computer system receives a Flash file to be tested. The ActionScript emulator implements a modified version of a class typically implemented by an ActionScript virtual machine. The ActionScript emulator reveals one or more tagged data blocks (tags) contained within the Flash file by decoding the Flash file. The ActionScript emulator determines whether the one or more tags are capable of containing ActionScript bytecode (ABC) by evaluating the one or more tags. When an affirmative determination results with respect to a tag of the one or more tags, then the ActionScript emulator interprets and executes the ABC associated with the tag. Responsive to invocation of a predetermined method of the modified class by the ABC, the ActionScript emulator reports existence of embedded Flash within the Flash file.
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