Microsoft identified a North Korean threat actor exploiting a zero-day vulnerability in Chromium (CVE-2024-7971) to gain remote code execution (RCE) in the Chromium renderer process. Our assessment of ongoing analysis and observed infrastructure attributes this activity to Citrine Sleet, a North Korean threat actor that commonly targets the cryptocurrency sector for financial gain.
On July 25, 2024, the United States Department of Justice (DOJ) indicted an individual linked to the North Korean threat actor that Microsoft tracks as Onyx Sleet. Microsoft Threat Intelligence collaborated with the Federal Bureau of Investigation (FBI) in tracking activity associated with Onyx Sleet.
Microsoft has identified a new North Korean threat actor, now tracked as Moonstone Sleet (formerly Storm-1789), that combines many tried-and-true techniques used by other North Korean threat actors, as well as unique attack methodologies to target companies for its financial and cyberespionage objectives.
Microsoft, in collaboration with OpenAI, is publishing research on emerging threats in the age of AI, focusing on identified activity associated with known threat actors Forest Blizzard, Emerald Sleet, Crimson Sandstorm, and others. The observed activity includes prompt-injections, attempted misuse of large language models (LLM), and fraud.
Microsoft has uncovered a supply chain attack by the threat actor Diamond Sleet (ZINC) involving a malicious variant of an application developed by CyberLink Corp. This malicious file is a legitimate CyberLink application installer that has been modified to include malicious code that downloads, decrypts, and loads a second-stage payload.
Since early October 2023, Microsoft has observed North Korean nation-state threat actors Diamond Sleet and Onyx Sleet exploiting the Jet Brains TeamCity CVE-2023-42793 remote-code execution vulnerability. Given supply chain attacks carried out by these threat actors in the past, Microsoft assesses that this activity poses a particularly high risk to organizations who are affected.
Microsoft security researchers investigate an attack where the threat actor, tracked DEV-0139, used chat groups to target specific cryptocurrency investment companies and run a backdoor within their network.
At CyberWarCon 2022, Microsoft and LinkedIn analysts presented several sessions detailing analysis across multiple sets of actors and related activity.
In recent months, Microsoft detected weaponization of legitimate open-source software by an actor the Microsoft Threat Intelligence Center (MSTIC) tracks as ZINC, targeting employees at media, defense and aerospace, and IT service provider organizations in the US, UK, India, and Russia.
A group of actors originating from North Korea that MSTIC tracks as DEV-0530 has been developing and using ransomware in attacks since June 2021. This group, which calls itself H0lyGh0st, utilizes a ransomware payload with the same name.
