Researchers have found a fourth strain of malware – Raindrop – that was used in the SolarWinds supply chain attack, a loader similar to the Teardrop tool.

But while Teardrop was delivered by the original Sunburst backdoor in early July 2020, Raindrop was used just under two weeks later for spreading laterally across the victim’s network, Symantec said in a report.

“The discovery of Raindrop is a significant step in our investigation of the SolarWinds attacks as it provides further insights into post-compromise activity at organizations of interest to the attackers,” Symantec researchers wrote on the heels of the revelation of third strain – Sunspot – disclosed Jan. 11 by Crowdstrike. “While Teardrop was used on computers that had been infected by the original Sunburst trojan, Raindrop appeared elsewhere on the network, being used by the attackers to move laterally and deploy payloads on other computers.”

Please register to continue.

Already registered? Log in.

Once you register, you'll receive:

  • News analysis

    The context and insight you need to stay abreast of the most important developments in cybersecurity. CISO and practitioner perspectives; strategy and tactics; solutions and innovation; policy and regulation.

  • Archives

    Unlimited access to nearly 20 years of SC Media industry analysis and news-you-can-use.

  • Daily Newswire

    SC Media’s essential morning briefing for cybersecurity professionals.

  • Learning Express

    One-click access to our extensive program of virtual events, with convenient calendar reminders and ability to earn CISSP credits.