Microsoft smothers malware by tracking behavior instead of blocking domains

Date:
Wed, 19 Aug 2026 14:20:00 +0000

Description:
Blocking domains is a game of whack-a-mole in which attackers automate new moles popping up almost instantly.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter Microsoft says blocking domains is ineffective against MacSync Stealers evolving infrastructure Defender experts tracked over 30 domains by analyzing behavioral patterns instead Mitigation focuses on spotting suspicious shell sessions, osascript activity, and /tmp/sync archives Microsoft says it has found a way to stop the
dangerous MacSync Stealer malware by monitoring certain behaviors, rather
than keeping track of the domains used in the attacks.

MacSync Stealer is a piece of infostealer malware built for the Apple ecosystem - it steals passwords, browser data, cookies, Keychain secrets, cryptocurrency wallets, Telegram sessions, SSH/cloud credentials and other sensitive information. It was being distributed via ClickFix scams. Victims would visit a malicious website which would tell them they had a problem (an outdated browser or a protected document that can only be viewed after verifying identities), and which would immediately offer a solution. That solution is to bring up the Terminal and paste a command which, in reality, deployed the malware. Latest Videos From TechRadar Watch full video here:

Initially, defenders would keep their Mac fleets safe by blocking the domains used to host the infrastructure - the websites, the malware executables, and the exfiltrated data. But they soon realized that a new domain would pop up
as soon as the old one was blocked, and the malware would continue its operations unabated. Behavioral analysis Now, in a new report , Microsoft
said it successfully identified more than 30 domains by looking at behavioral patterns such as repeated execution, request characteristics, staging behavior, and upload methods. You may like How parked domains became a cybercrime goldmine Inside the relentless rise of the macOS AMOS infostealer Microsoft introduces security upgrades to tackle ShinyHunters

Microsoft Defender Experts expanded that view by correlating recurring endpoints and network behaviors across the activity. This behavior-led approach connected more than 30 domains and showed that the infrastructure supported more than C2 communication, extending into active collection, staging, and exfiltration, Microsoft explained.

In other words, to defend against MacSync Stealer, dont focus on blocking domains. Instead, pay attention to shell sessions spawning curl with specific flag combinations, osascript quickly chaining into network activity, and archives appearing under /tmp/sync just before outbound PUT traffic begins. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. The best antivirus for all budgets Our top picks, based on real-world testing and comparisons

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