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2017 | OriginalPaper | Buchkapitel

Ransomware and the Legacy Crypto API

verfasst von : Aurélien Palisse, Hélène Le Bouder, Jean-Louis Lanet, Colas Le Guernic, Axel Legay

Erschienen in: Risks and Security of Internet and Systems

Verlag: Springer International Publishing

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Abstract

Ransomware are malicious software that encrypt their victim’s data and only return the decryption key in exchange of a ransom. After presenting their characteristics and main representatives, we introduce two original countermeasures allowing victims to decrypt their files without paying. The first one takes advantage of the weak mode of operation used by some ransomware. The second one intercept calls made to Microsoft’s Cryptographic API. Both methods must be active before the attack takes place, and none is general enough to handle all ransomware. Nevertheless our experimental results show that their combination can protect users from 50% of the active samples at our disposal.

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Titel: Ransomware and the Legacy Crypto API
verfasst von: Aurélien Palisse
Hélène Le Bouder
Jean-Louis Lanet
Colas Le Guernic
Axel Legay
Verlag: Springer International Publishing
Buch: Risks and Security of Internet and Systems
Print ISBN: 978-3-319-54875-3

Electronic ISBN: 978-3-319-54876-0

Copyright-Jahr: 2017
DOI: https://doi.org/10.1007/978-3-319-54876-0_2

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