The Iran-linked threat group known as APT35 (aka Charming Kitten, Imperial Kitten, or Tortoiseshell) has updated its cyberattack arsenal with improved abilities to hide its actions, as well as an upgraded custom backdoor that it’s distributing via a spear-phishing campaign. The advanced persistent threat (APT) has been alleged to be operating out of Iran and…

Iran-linked Charming Kitten group, (aka APT35, Phosphorus, Newscaster, and Ajax Security Team) made the headlines in 2014 when experts at iSight issued a report describing the most elaborate net-based spying campaign organized by Iranian hackers using social media. Microsoft has been tracking the threat actors at least since 2013, but experts believe that the cyberespionage…