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Over 600,000 small office/home office (SOHO) routers were disabled in a cyber attack, cutting off users’ internet access. Security analysts at Lumen Technologies’ Black Lotus Labs discovered and reported on an attack in a recent blog post.
There was a mysterious event in the U.S. that happened from October 25 to 27, 2023. It affected a single internet service provider (ISP) and was called Pumpkin Eclipse by the Lumen Technologies Black Lotus Labs team. The event specifically impacted three router models used by the ISP: ActionTec T3200, ActionTec T3260, and Sagemcom.
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The company said in a technical report that “The incident took place over a 72-hour period between October 25-27, rendered the infected devices permanently inoperable, and required a hardware-based replacement,”.
The blackout was important because it resulted in the sudden removal of 49% of all modems from the affected ISP’s autonomous system number (ASN).
Lumen’s analysis has revealed that a remote access trojan (RAT) called Chalubo is responsible for the sabotage. This malware was first documented by Sophos in October 2018. The adversary chose to use Chalubo instead of a custom toolkit, possibly to make it harder to determine who is responsible.
“Chalubo has payloads designed for all major SOHO/IoT kernels, pre-built functionality to perform DDoS attacks, and can execute any Lua script sent to the bot,” the company said. “We suspect the Lua functionality was likely employed by the malicious actor to retrieve the destructive payload.”
It is believed that weak credentials or an exposed administrative interface may have facilitated the breach of the routers.
Source: Lumen, Reuters
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