Tuesday, October 19, 2021

Too Log; Didn’t Read — Unknown Actor Using CLFS Log Files for Stealth

The Mandiant Advanced Practices team recently discovered a new malware family we have named PRIVATELOG and its installer, STASHLOG. In this post, we will share a novel and especially interesting technique the samples use to hide data, along with detailed analysis of both files that was performed with the support of FLARE analysts. We will also share sample detection rules, and hunting recommendations to find similar activity in your environment.

Mandiant has yet to observe PRIVATELOG or STASHLO…

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