The Egregror ransomware is quickly making a name for itself by victimizing big corporations. How does it work and what is its background?
What is Egregor?
Egregor ransomware is a relatively new ransomware (first spotted in September 2020) that seems intent on making its way to the top right now. Egregor is considered a variant of Ransom.Sekhmet based on similarities in obfuscation, API-calls, and the ransom note.
The primary distribution method for Egregor is Cobalt Strike. Targeted environments are initially compromised through various means (RDP probing, phishing) and once the Cobalt Strike beacon payload is established and persistent, it is then used to deliver and launch the Egregor payloads.
But since Egregor is a ransomware-as-a-service (RaaS) operation with multiple affiliates, the delivery and weaponization tactics can vary. We’ve also seen it being spread via phishing emails recently. The attack typically unfolds in two steps: initial compromise with email lure that drops Qakbot, followed by the actual Egregor ransomware. The latter is deployed manually by the attackers who have previously gained access as a result of the initial compromise.