Microsoft plans to get rid of three Microsoft 365 companion apps before the end of the year. Calendar, People, and Files are all on the chopping block and set to be retired on December 16, 2026.Calendar, People, and Files are apps that integrate with the taskbar on Windows 11 to allow quick access to certain tasks and pieces of information.I'd... Weiterlesen
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These Microsoft 365 companion apps are getting retired after just one year
Microsoft plans to get rid of three Microsoft 365 companion apps before the end of the year. Calendar, People, and Files are all on the chopping block and set to be retired on December 16, 2026.Calendar, People, and Files are apps that…
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title: Detect Exploitation - These Microsoft 365 companion apps are getting retired after just one year
id: 288e0f79-6486-4aad-a9f6-b21e52fa0c73
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "These Microsoft 365 companion " ascii wide
condition:
any of them
}index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("These Microsoft 365 companion apps are g")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countmessage: "*These Microsoft 365 companion apps are g*"CommonSecurityLog
| where Message has "These Microsoft 365 companion apps are g"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desctsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich These Microsoft 365 companion apps are g.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
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⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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