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    Archive for the ‘Spam’ Category




    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 |



    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 |



    During the last week of August 2014, we observed a salad spam surge caused by KELIHOS spambot.  Salad spam contains gibberish words in the email body, and is usually employed by cybercriminals so as to bypass spam filters. Here are some samples we spotted: Figures 1-2: Screenshots of spammed messages Majority of this outbreak’s victims are from the United States.  Based on our data, the top sending countries for this spam run are Spain, Germany, Italy, Iran, and the United States. Figure 3: Top sending countries ...

    Posted in Botnets, Malware, Spam |



    Today, spam may not be regarded as the most high-profile concern, but it's still a serious day-to-day threat. Every month, our users alone have to deal with billions of spam messages. These are also frequently used to deliver malware using attachments or links to malicious sites. One of the most powerful tools in dealing with spam is IP reputation. This checks the IP address that sent a particular email against addresses that are known to have sent spam messages before. These addresses ...

    Posted in Spam |


     

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