Entries by Rodolfo Saccani

The mysterious protocols: SPF, DKIM and DMARC explained

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Email is an ancient thing, it was born much longer before the Internet. The first email system was born in 1965 at MIT. At that time email communication was limited within the boundaries of a single mainframe, those huge and very expensive and delicate multi-user computers that occupied entire air-conditioned rooms and required continuous supervision. […]

Email trojan horse: application/html entity

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We just discovered a new trick that is currently being used to slip malicious html files through email security solutions and,  in some cases, through antivirus engines. The trick is quite simple: declaring an email entity as “application/html” instead of “text/html”. “application/html” is an invalid type and this allows it to slip through some checks. […]

Phishing campaign uses Google reCAPTCHA to avoid Sandbox detection

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Recent email phishing campaigns are using Google reCAPTCHA as part of their efforts to bypass click-time protection sandboxing, requiring user interaction before delivering the actual contents of the phishing page. We have seen two different instances of such campaigns, both are targeting Office 365 users in order to collect their credentials. Implementation details suggest that […]

Ramnit apparently still spreading after 9 years

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It might be a targeted attack, given that we detected it only in one organization, or it might just be an ancient infection still attempting to propagate. In both cases it is an interesting case. The attack is coming via email, which is interesting given that it is a vbscript attack. Here is how the […]