EtterSilent
EtterSilent is the name used for macro-enabled Excel documents delivered in early TA584 email campaigns to facilitate malware installation. Proofpoint describes these documents as an earlier delivery method in TA584 attack chains, prior to the group’s later shift to ClickFix-based social engineering. The infection vector was email-delivered Excel attachments that required victims to enable macros, after which the document could install follow-on malware. High-confidence reporting in the provided content links this delivery chain to TA584, a high-volume email-centric cybercriminal initial access broker targeting organizations globally. One documented March 2021 TA584 campaign used a macro-enabled Excel/EtterSilent chain to deliver Ursnif. The content does not provide standalone technical details, persistence mechanisms, or specific indicators of compromise unique to EtterSilent beyond its use as a macro-enabled Excel installer in TA584 campaigns.
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Groups observed using it
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
“In early campaigns, TA584 also delivered macro-enabled Excel documents (tracked as EtterSilent)…”
Techniques & procedures
1 distinct technique documented for this family, organized by ATT&CK tactic.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Macro-enabled Excel-based initial-stage payload used to facilitate installation of subsequent malware in TA584 campaigns.
Tracking name for TA584’s macro-enabled Excel document delivery mechanism used in earlier campaigns to lead to malware installation when macros are enabled.
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