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36 lines
1.1 KiB
YAML
36 lines
1.1 KiB
YAML
title: CVE-2021-26858 Exchange Exploitation
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id: b06335b3-55ac-4b41-937e-16b7f5d57dfd
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description: Detects possible successful exploitation for vulnerability described in CVE-2021-26858 by looking for |
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creation of non-standard files on disk by Exchange Server’s Unified Messaging service |
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which could indicate dropping web shells or other malicious content
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author: Bhabesh Raj
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status: experimental
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level: critical
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references:
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- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858
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- https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
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date: 2021/03/03
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tags:
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- attack.t1203
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- attack.execution
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- cve.2021-26858
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logsource:
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category: file_event
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product: windows
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detection:
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selection:
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Image|endswith: 'UMWorkerProcess.exe'
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filter:
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TargetFilename|endswith:
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- 'CacheCleanup.bin'
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- '.txt'
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- '.LOG'
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- '.cfg'
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- 'cleanup.bin'
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condition: selection and not filter
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fields:
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- ComputerName
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- TargetFilename
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falsepositives:
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- Unknown
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