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Posts Tagged ‘core functions’

Compromised Sites Conceal StealRat Botnet Operations

22
Jul
2013

Advances in spam detection meant that spam operators had to find ways to circumvent new technologies. For instance, Asprox made significant improvements in their spam and module architecture whereas Pushdo made use of decoy network traffic.Recently, we have discovered a new simple method used by a spam botnet we named StealRat. It consists of 3 […]

Category General Written by Security Intelligence 0 Comments

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Analysis of a self-debugging Sirefef cryptor

29
May
2013

Recently I wrote a blog post about a legitimate website spreading Sirefef malware. Then I continued with a deeper analysis and noticed that it uses an interesting cryptor.Malware authors spread many new variants of malware every day. These variants often look completely different at the first glance. That’s why regular updates of your antivirus is […]

Category General Written by Avast! blog 0 Comments

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