DNS Query Request By QuickAssist.EXE

SIGMA detection rule by Muhammad Faisal (@faisalusuf) · NOASSERTION

Detects DNS queries initiated by "QuickAssist.exe" to Microsoft Quick Assist primary endpoint that is used to establish a session.

title: DNS Query Request By QuickAssist.EXE
id: 882e858a-3233-4ba8-855e-2f3d3575803d
status: experimental
description: |
    Detects DNS queries initiated by "QuickAssist.exe" to Microsoft Quick Assist primary endpoint that is used to establish a session.
references:
    - https://www.microsoft.com/en-us/security/blog/2024/05/15/threat-actors-misusing-quick-assist-in-social-engineering-attacks-leading-to-ransomware/
    - https://www.linkedin.com/posts/kevin-beaumont-security_ive-been-assisting-a-few-orgs-hit-with-successful-activity-7268055739116445701-xxjZ/
    - https://x.com/cyb3rops/status/1862406110365245506
    - https://learn.microsoft.com/en-us/windows/client-management/client-tools/quick-assist
author: Muhammad Faisal (@faisalusuf)
date: 2024-12-19
tags:
    - attack.command-and-control
    - attack.initial-access
    - attack.lateral-movement
    - attack.t1071.001
    - attack.t1210
logsource:
    category: dns_query
    product: windows
detection:
    selection:
        Image|endswith: '\QuickAssist.exe'
        QueryName|endswith: 'remoteassistance.support.services.microsoft.com'
    condition: selection
falsepositives:
    - Legitimate use of Quick Assist in the environment.
level: low

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

daff2518-26b6-434a-ad73-a4044b74edac

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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