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Peter Ferrie
Virus Bulletin, February 2011, pp. 4-7
ISSN 0956-9979
February 2011

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Imagine a JavaScript encoding method that produces files that contain no alphanumeric characters, only symbols such as ‘$’, ‘_’, and ‘+’. It would be difficult to imagine how it could possibly work, but unfortunately one such encoder exists. It is called ‘JJEncode’. A demonstration version is freely available from the author’s website, and has already been used in malware. This article provides a detailed description of how it works.

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