logo

Malicious RTF Documents Spreading Malware

ID: 94b631d6-1e40-54d4-8a03-e0e7f81a7c1e

STIX ID: report--94b631d6-1e40-54d4-8a03-e0e7f81a7c1e

Feed Name: Zscaler Security Research Blog

Threat Score
70/100

Date Published: 2025-04-02

Date Updated: 2026-05-01

...
...

Malicious RTF documents embed multiple Excel OLE objects and use the \objupdate control to force repeated macro prompts and execution; embedded VBA runs PowerShell to drop a VBS (svchost32.vbs) which downloads and executes svchost.exe, resulting in NetWiredRC and Quasar RAT infections. The macro also modifies registry keys to permanently enable Office macros. The report includes deobfuscated macro/VBS/PowerShell details, infection flow, and IOCs (MD5 hashes, download URLs, C2 domains/IPs) tracked by Zscaler ThreatLabZ.

Your team is not currently subscribed to this feed. You must subscribe to it in order to see this post.