Ransomware is a form of malware designed to encrypt files on a device, rendering any files and the systems that rely on them unusable. Malicious actors then demand ransom in exchange for decryption.
Darkside is a group of hackers that carried out a significant ransomware attack in May 2021. In August 2020, Darkside introduced its Ransomware-as-a-Service (RaaS) in a press release. The group provides web chat support to victims, builds intricate data leak storage systems with redundancy, and performs financial analysis of victims prior to attacking. The group is suspected to be former IT security professionals and is known to have a code of conduct that includes not attacking hospitals, schools, non-profits, or governments, but rather big organizations. After the May 2021 Colonial Pipeline attack, Varonis’s reverse engineering revealed that Darkside’s malware checked device language settings to ensure that they don’t attack Russia-based organizations. Darkside has Windows and Linux toolsets, is similar to NetWalker and REvil in that it has an affiliate program that offers anyone who helps spread their malware 10-25% of the payout.
- runs command and control over TOR,
- avoids nodes where EDR is running,
- uses waiting periods,
- saves noisier actions for later stages,
- customizes code and connection hosts for each victim,
- obfuscates with encoding and dynamic library loading, and
- performs anti-forensics techniques, such as deleting log files.
TrickBot is ransomware that was first identified in 2016. It is a trojan developed and operated by a group of hackers who initially made it as a banking trojan to steal financial data. TrickBot has become a highly modular, multi-stage suite of tools to conduct myriad illegal cyber activities. TrickBot has been used
- To exfiltrate data (email, credentials, point-of-sale info);
- For crypto-mining; and
- For host enumeration (reconnaissance of Unified Extensible Firmware Interface (UEFI) or Basic Input/Output System (BIOS) firmware)
- Emotet and Bokbot
- Spearphishing, spam campaigns, malvertising, and network vulnerabilities, such as Server Message Block, to gain initial access