Blast from the past: stowaway Virut delivered with Chinese DDoS bot

Recently, we described an unusual Chinese drive-by attack that was delivering a variant of the Avzhan DDoS bot. The attack also contained multiple components that were not-so-new. Among the exploits, the newest was from 2016. Avzhan is also not a recent malware—the compilation timestamp of the...

Avzhan DDoS bot dropped by Chinese drive-by attack

The Avzhan DDoS bot has been known since 2010, but recently we saw it in wild again, being dropped by a Chinese drive-by attack. In this post, we'll take a deep dive into its functionality and compare the sample we captured with the one described in the past. Analyzed sample...

Nitol Botnet Shares Code with Other China-Based DDoS Malware

Microsoft has learned that much of the code used by the Nitol malware family is copied from free malware resources hosted on Chinese websites. Microsoft posted portions of the code online this week where similar lines used for denial of service attack functionality are present in Nitol and on the...