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.”
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