Multiple Malware Variants Distributed Through Microsoft OneNote

skywatcg-alert-2

  • ransom-4

    TLP-GREEN

Spear-phishing emails with malicious Microsoft OneNote attachments were discovered delivering variants from the AsyncRAT, Formbook, Remcos, and XWorm malware families.

Multiple legitimate Microsoft Windows utilities were used to carry out the operation including cmd, BITSAdmin, PowerShell, wscript, and curl.

The adversary took advantage of the right-to-left override (RTLO or RLO) technique to convince the victim to execute files which appeared to be benign.

SkyWatchSM Alert Legend

  • small-bell

    Warning

  • active-threat0-lt-green

    Active Threat

  • malware-lt-green

    Malware

  • ransome-lt-green

    Ransomware

  • warning-green

    Phishing

  • file-green

    Network/IOT

Glesec Information Sharing Protocol

GLESEC CYBER SECURITY INCIDENT REPORTS are in compliance with the U.S. Department of Homeland Security (DHS) Traffic-Light Protocol (TLP).

  • TLP-White

    Disclosure is Not Limited.

  • TLP-Green

    Limited Disclosure, Restricted Only to the Community.

  • TLP-Amber

    Limited Disclosure, restricted to the Participant's Organization.

  • TLP-Red

    Not for Disclosure, Restricted/ Classified - Only Shared with US DHS.

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