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    Archive for the ‘Spam’ Category




    Email authentication and validation is one method that is used to help bring down the levels of spam and phishing by identifying senders so that malicious emails can be identified and discarded. Two frameworks are in common usage today; these are SPF and DKIM. SPF (Sender Policy Framework): Defined in RFC 7208, SPF provides a mechanism to allow receivers to check that incoming mail from a domain is being sent from a host authorized by that domain's owner. The list of ...

    Posted in Spam |



    Earlier this week, we noticed that there was a spike in the volume of spammed messages that pretend to come from the messaging service Viber.  This app, which also has  a desktop version, allows users for free calls and messages. The email informs the recipient that they have one voice message for their account. Figure 1. Sample spammed message Different Routines for PC and Mobile The infection routine is pretty straightforward for computers: clicking the embedded link leads to the download of backdoor malware, detected ...




    We recently observed a new ransomware variant, TorrentLocker, that was targeted at nearly 4,000 organizations and enterprises, many of which are located in Italy. TorrentLocker is similar to an earlier ransomware family (CryptoLocker), and also encrypts various files and forces users to pay a sum of money. TorrentLocker uses the TOR anonymity network to hide its network traffic, which may have been the origin of its name. The said threat used spam email written in Italian with several templates as part of ...

    Posted in Malware, Spam |



    A new spam attack disguised as invoice message notifications was recently seen spreading the UPATRE malware, that ultimately downloads its final  payload- a BANKER malware related to the DYREZA/DYRE banking malware. Background In early October we observed a surge of spammed messages sent by the botnet CUTWAIL/PUSHDO, totaling to more than 18,000 messages seen in a single day. CUTWAIL/PUSHDO has been in the wild since as early as 2007 and was considered one of the biggest spam botnets in 2009. We spotted some spammed emails that disguise itself as invoice message ...

    Posted in Malware, Spam | Comments Off



    In the two previous parts of this series of blog posts, we discussed the kinds of threats that we're seeing on Twitter, as well as the scope and scale of these threats. In this part, we will discuss their motivations, and what end users can do. The first question is: why do cybercriminals bother doing this? Social media accounts are valuable in their own right. These accounts can typically be used to make money in many ways for cybercriminals; any form of ...

    Posted in Social, Spam | Comments Off


     

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