Calendar Meeting Links Used To Spread Mac Malware

Hackers targeting individuals in the cryptocurrency sector are using a sophisticated phishing scheme that begins with a malicious link on Calendly. "The attackers impersonate established cryptocurrency investors and ask to schedule a video conference call," reports Krebs on Security. "But clicking the meeting link provided by the scammers prompts the user to run a script that quietly installs malware on macOS systems." From the report: A search in Google for a string of text from that script turns up a December 2023 blog post from cryptocurrency security firm SlowMist about phishing attacks on Telegram from North Korean state-sponsored hackers. "When the project team clicks the link, they encounter a region access restriction," SlowMist wrote. "At this point, the North Korean hackers coax the team into downloading and running a 'location-modifying' malicious script. Once the project team complies, their computer comes under the control of the hackers, leading to the theft of funds." SlowMist says the North Korean phishing scams used the "Add Custom Link" feature of the Calendly meeting scheduling system on event pages to insert malicious links and initiate phishing attacks. "Since Calendly integrates well with the daily work routines of most project teams, these malicious links do not easily raise suspicion," the blog post explains. "Consequently, the project teams may inadvertently click on these malicious links, download, and execute malicious code." SlowMist said the malware downloaded by the malicious link in their case comes from a North Korean hacking group dubbed BlueNoroff, which Kaspersky Labs says is a subgroup of the Lazarus hacking group. "A financially motivated threat actor closely connected with Lazarus that targets banks, casinos, fin-tech companies, POST software and cryptocurrency businesses, and ATMs," Kaspersky wrote of BlueNoroff in Dec. 2023.

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