Curious Serpens

Actor Type Nation State
Attributed to Nation Iran
Directly Linked Intrusion Sets Peach Sandstorm , Refined Kitten , APT33
Associated MITRE ATT&CK Group APT33 (G0064)

Curious Serpens (also known as Peach Sandstorm, APT33, Elfin, HOLMIUM, MAGNALIUM, or REFINED KITTEN) is a suspected Iranian-affiliated espionage group active since at least 2013. They have targeted aerospace and energy sectors in the Middle East, the United States, and Europe.

According to researchers at Palo Alto's Unit 42, the group have been observed using the FalseFont backdoor. FalseFont is a backdoor used to mimic legitimate human resources software, tricking victims into installing it under the guise of a job recruitment process.

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Curious Serpens Threat Reports

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Curious Serpens’ FalseFont Backdoor: Technical Analysis, Detection and Prevention

This article by researchers at Unit 42 discusses the FalseFont backdoor used by Curious Serpens, an Iranian-affiliated espionage group targeting ...

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