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More mitigation recommendations are outlined in this blog. Organizations who cannot take advantage of these protections can set the FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION registry key to avoid exploitation. In addition, customers who use Microsoft 365 Apps ( Versions 2302 and later) are protected from exploitation of the vulnerability via Office. Customers who use Microsoft Defender for Office 365 are protected from attachments that attempt to exploit CVE-2023-36884. Microsoft 365 Defender detects multiple stages of Storm-0978 activity. Identified ransomware attacks have impacted the telecommunications and finance industries, among others. Storm-0978’s targeted operations have impacted government and military organizations primarily in Ukraine, as well as organizations in Europe and North America potentially involved in Ukrainian affairs. Storm-0978 is known to target organizations with trojanized versions of popular legitimate software, leading to the installation of RomCom. The actor’s latest campaign detected in June 2023 involved abuse of CVE-2023-36884 to deliver a backdoor with similarities to RomCom. The actor also deploys the Underground ransomware, which is closely related to the Industrial Spy ransomware first observed in the wild in May 2022. Storm-0978 operates, develops, and distributes the RomCom backdoor. Storm-0978 (DEV-0978 also referred to as RomCom, the name of their backdoor, by other vendors) is a cybercriminal group based out of Russia, known to conduct opportunistic ransomware and extortion-only operations, as well as targeted credential-gathering campaigns likely in support of intelligence operations. The campaign involved the abuse of CVE-2023-36884, which included a remote code execution vulnerability exploited before disclosure to Microsoft via Word documents, using lures related to the Ukrainian World Congress. Microsoft has identified a phishing campaign conducted by the threat actor tracked as Storm-0978 targeting defense and government entities in Europe and North America.

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