Siesta is a cyber threat actor replicating APT1 tactics, primarily conducting espionage-focused operations.
Analyst brief
Siesta is a cyber threat actor likely linked to the Chinese cyber-espionage group APT1 or is a group replicating their TTPs. It primarily engages in espionage-focused operations. The actor uses the same tools, modus operandi, and infrastructure described in TrendMicro's blog, suggesting it operates with legacy APT1 tactics. Defenders should focus on shared attributes and known public indicators that allow for detecting multiple actors with a single signature.
Siesta
unknown
FireEye recently looked deeper into the activity discussed in TrendMicro’s blog and dubbed the “Siesta” campaign. The tools, modus operandi, and infrastructure used in the campaign present two possibilities: either the Chinese cyber-espionage unit APT1 is perpetrating this activity, or another group is using the same tactics and tools as the legacy APT1.
The Siesta campaign reinforces the fact that analysts and network defenders should remain on the lookout for known, public indicators and for shared attributes that allow security experts to detect multiple actors with one signature.