APT28 conducts long-term espionage on Ukrainian forces using custom malware
APT28 conducts long-term espionage on Ukrainian forces using custom malware
Publish Date: 2026-03-10 11:17:00
Source Domain: securityaffairs.com
APT28 conducts long-term espionage on Ukrainian forces using custom malware
Pierluigi Paganini
March 10, 2026
APT28 used BEARDSHELL and COVENANT malware to spy on Ukrainian military personnel, enabling long-term surveillance since April 2024.
The Russia-linked group APT28 (aka UAC-0001, aka Fancy Bear, Pawn Storm, Sofacy Group, Sednit, BlueDelta, and STRONTIUM) has used BEARDSHELL and COVENANT malware to conduct long-term surveillance of Ukrainian military personnel. According to ESET, the campaign began in April 2024 and relies on custom implants designed to maintain persistent access and collect sensitive information from targeted systems.
“Since April 2024, Sednit’s advanced development team has reemerged with a modern toolkit centered on two paired implants, BeardShell and Covenant, each using a different cloud provider for resilience.” reads the report published by ESET. “This dual‑implant approach enabled long‑term surveillance of Ukrainian military personnel. Interestingly, these current toolsets show a direct code lineage to the group’s 2010‑era implants.”
The APT28 group has been active since at least 2007 and it has targeted governments, militaries, and security organizations worldwide. The group was involved also in the string of attacks that targeted 2016 Presidential election.
The group operates out of military unity 26165 of the Russian General Staff Main Intelligence Directorate (GRU) 85th Main Special Service Center (GTsSS).
BEARDSHELL and SLIMAGENT are two advanced malware tools written in C++. BEARDSHELL downloads, decrypts (using ChaCha20-Poly1305), and runs PowerShell scripts, sending results via the Icedrive API. It creates a unique folder on each infected machine based on system identifiers. SLIMAGENT captures screenshots using Windows APIs, encrypts them with AES and RSA, and stores them locally with timestamped filenames. Both…
