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MacSync macOS infostealer with dynamic AppleScript and in-memory execution

Malware Activity
First reported
Last updated
Happening score
H score 33
2 unique sources, 2 articles

Summary

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The MacSync macOS infostealer now uses dynamic AppleScript payloads and in-memory execution to reduce static detection and complicate response. It is being delivered through ClickFix lures that trick users into running terminal commands, increasing the risk of theft on macOS systems. The malware can steal credentials, files, keychain databases, and crypto-wallet seed phrases, making the latest variant especially risky for high-value users.

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Advisory/Mitigation
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Technical Analysis
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Timeline

  1. 10.05.2026 20:52 1 articles · 17d ago

    MacSync campaign abuses Google Ads and Claude.ai chats

    Campaign Scope Update

    A MacSync macOS infostealer campaign is abusing Google Ads and legitimate Claude.ai shared chats to lure users searching for "Claude mac download" into following Terminal instructions that download and run malware on their Mac. One observed variant uses polymorphic delivery, checks for Russian or CIS-region keyboard input sources and sends a cis_blocked ping before exiting, then profiles the victim with external IP address, hostname, OS version, and keyboard locale before using osascript to run a second-stage payload; another variant skips profiling and exfiltrates browser credentials, cookies, and macOS Keychain contents.

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  2. 16.03.2026 13:41 2 articles · 2mo ago

    MacSync macOS infostealer with dynamic AppleScript and in-memory execution

    Initial Disclosure

    MacSync was first pushed through **ClickFix** lures that used fake install flows and Terminal commands to make victims run the payload. The latest phase adds **dynamic AppleScript** and **in-memory execution**, strengthening evasion while preserving theft of sensitive macOS data.

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