CosmicStrand
CosmicStrand (canonical Kaspersky GReAT naming per July 25, 2022 disclosure.
Qihoo360 original 2017 Chinese-side naming "Spy Shadow Trojan") is a Chinese-speaking threat actor signature UEFI firmware rootkit specialist cluster active publicly since end of 2016, operationally one of the earliest documented in-the-wild UEFI rootkits chronologically (operationally pre-dating LoJax 2018 first widespread UEFI rootkit publication)
Chinese-speaking attribution operates at strong-indicator level per Kaspersky GReAT via code overlaps with two adjacent Chinese-speaking malware families: MyKings (Smominru / DarkCloud) cryptocurrency botnet, Sophos attribution analysis found Chinese-language artefacts.
and MoonBounce UEFI implant, Kaspersky January 2022 disclosure attributed to China-linked Winnti / APT41 cluster (apt41_wickedpanda curated separately), the MoonBounce code overlap operationally suggests potential Chinese- state-aligned offensive cyber capability development ecosystem connection though CosmicStrand is operationally tracked as a distinct cluster from APT41.
signature operational tradecraft is UEFI firmware rootkit capability (cluster-defining 96.84KB file located in firmware images of Gigabyte or Asus motherboards with Intel H81 chipset, UEFI is the first software to execute during boot allowing access and control over all hardware components.
persists through OS reinstall and hard drive replacement)
modified CSMCORE DXE driver tradecraft (signature firmware modification patching the CSMCORE DXE driver which facilitates legacy boot via MBR to intercept the boot sequence and introduce malicious logic)
kernel- level Windows implant deployment via boot chain hijack (tampers with OS loading process to deploy kernel-level implant into Windows every time it boots, using entrenched access to launch shellcode that connects to remote C&C server to fetch actual malicious payload); PatchGuard disable capability + local administrators user account creation + two-variant operational pattern (2016- 2017 + 2020 each with separate C&C server)
specific hardware targeting (Gigabyte + Asus + H81 chipset operationally suggesting common vulnerability or supply- chain compromise vector specific to H81 chipset designs); hardware supply-chain compromise hypothesis per Qihoo360 2017 analysis (second-hand backdoored motherboard from reseller hypothesis based on actual ASUS motherboard victim analyzed by Qihoo360, "their report, the compromised system ran on a second-hand ASUS motherboard that the owner had purchased from an online store")
mixed- geography private-individual victim distribution (China + Vietnam + Iran + Russia, operationally distinct targeting pattern from typical APT clusters with organizational targets, no organizational ties or industry vertical identified)
operationally distinct from existing 34 China-attributed clusters in the curated corpus through signature firmware-level (pre-OS) implant capability; fills the UEFI firmware rootkit specialist capability cell in the curated corpus as 35th China-attributed cluster, operationally significant for being among the earliest documented in-the-wild UEFI rootkits chronologically within the broader UEFI rootkit ecosystem (LoJax 2018 APT28 + MosaicRegressor 2020 + TrickBoot 2020 + FinFisher 2021 + MoonBounce 2022 APT41 + CosmicStrand 2022 + ESPecter + BlackLotus 2023 cybercriminal dark-web sale).