Feds: Beware AvosLocker ransomware attacks on critical infrastructure

US authorities issued a warning this week about potential cyberattacks against critical infrastructure from ransomware-as-a-service (RaaS) operation AvosLocker.

In a joint security advisory, the Cybersecurity Infrastructure and Security Agency (CISA) and FBI warned that AvosLocker has targeted multiple critical industries across the US as recently as May, using a wide variety of tactics, techniques, and procedures (TTPs), including double extortion and the use of trusted native and open source software.

The AvosLocker advisory was issued against a backdrop of increasing ransomware attacks across multiple sectors. In a report published Oct. 13, cyber-insurance company Corvus found a nearly 80% increase in ransomware attacks over last year, as well as a more than 5% increase in activity month-over-month in September.

What You Need to Know About AvosLocker Ransomware Group

AvosLocker does not discriminate between operating systems. It has thus far compromised Windows, Linux, and VMWare ESXi environments in targeted organizations.

It’s perhaps most notable for how many legitimate and open source tools it uses to compromise victims. These include RMMs like AnyDesk for remote access, Chisel for network tunneling, Cobalt Strike for command-and-control (C2), Mimikatz for stealing credentials, and the file archiver 7zip, among many more.

The group also likes to use living-off-the-land (LotL) tactics, making use of native Windows tools and functions such as Notepad++, PsExec, and Nltest for performing actions on remote hosts.

To read the complete article, visit Dark Reading.