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On June 1, 2023, ReliaQuest published a blog highlighting a critical vulnerability in the file transfer software MOVEit. Just a few days later, on June 5, 2023, the Clop ransomware group claimed responsibility for a series of attacks exploiting the zero-day vulnerability, which is tracked as CVE-2023-34362. Clop claimed to have started exploiting the MOVEit vulnerability on May 27, 2023. The ransomware group also stated that it had not yet begun extorting victims.
The situation changed on June 6, 2023, when Clop published a new post on its data-leak site, “>_CLOP^_-LEAKS” – the dark web page where it shares data belonging to Clop victims who chose not to pay the requested ransom. In this post, Clop claimed to have stolen the data from hundreds of organizations using the MOVEit flaw and instructed victims about how to enter extortion negotiations with Clop, setting a deadline of June 14, 2023. In this post, Clop promised that every impacted organization that does not contact Clop ahead of this date will see its data exposed on Clop’s data-leak site. Clop stated that after 10 days of non-productive negotiation chats, data will be published for victims.
Figure 1: Details of ransom negotiations for companies impacted by MOVEit vulnerability (Source: Clop’s data-leak site)
MOVEit Transfer is a popular file-transfer tool used by many enterprises. The MOVEit vulnerability allows threat actors to escalate privileges and obtain unauthorized access to environments. Even before Clop’s responsibility claim, ReliaQuest had observed the vulnerability being actively exploited in the wild to exfiltrate data from companies operating in multiple sectors and geographies. As unpatched MOVEit servers remain exposed to the Internet, it is likely that exploitation will continue over the next few days by Clop and other threat actors.
Clop is one of the most sophisticated and technically skilled ransomware groups currently operating. Unlike most criminal enterprises in this space, Clop has adopted a more advanced strategy when compromising its victims, often relying on the exploitation of zero-day vulnerabilities in popular enterprise file transfer solutions. Many other ransomware groups will often take the traditional route, which involves reconnaissance, gaining initial access, establishing a foothold, lateral movement, exfiltration, and encryption. This entire process can take groups over a week for a successful attack. Meanwhile, Clop can conduct these large-scale attacks affecting hundreds of organizations in just a few days.
This latest attack showcases a new approach from Clop. For the first time ever, Clop posted on its data-leak site to announce its latest campaign and demanded that victims reach out to Clop to pay ransom payments. There may be three main reasons for this change in tactics:
Right now, all eyes are on June 14, 2023. That’s the date Clop set as the deadline for impacted victims to contact them and begin negotiations for ransom payments to avoid being posted on Clop’s data-leak site. Of course, Clop may well be bluffing with its threats to expose victims’ data. However, Clop itself said in its latest post on its data-leak site, Clop has been around for many years now and has often kept its promises (unfortunately). For example, Clop claimed to have breached hundreds of organizations using a GoAnywhere vulnerability in February 2023, and the group published close to 100 victims on its data-leak site the following month.
At this time, the name of organizations compromised by Clop remains unknown. Clop also did not disclose how many victims were breached, unlike in its previous attacks, and this suggests that this campaign could have been larger than any other conducted by the group. Clop has repeatedly demonstrated that it can extort a large number of organizations at the same time. It is safe to assume it intends to do the same this time.
ReliaQuest recommends that its impacted customers—along with every potential Clop victim—contact their legal teams for guidance on how to respond to Clop’s posting and execute Incident Response plans.
Even if you don’t use MOVEit’s software, there are actions you need to take:
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