Nasreddine Bencherchali
29 lines
1.2 KiB
YAML
29 lines
1.2 KiB
YAML
title: OWASSRF Exploitation Attempt Using Public POC - Proxy
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id: fdd7e904-7304-4616-a46a-e32f917c4be4
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status: experimental
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description: Detects exploitation attempt of the OWASSRF variant targeting exchange servers using publicly available POC. It uses the OWA endpoint to access the powershell backend endpoint
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references:
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- https://www.crowdstrike.com/blog/owassrf-exploit-analysis-and-recommendations/
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- https://www.rapid7.com/blog/post/2022/12/21/cve-2022-41080-cve-2022-41082-rapid7-observed-exploitation-of-owassrf-in-exchange-for-rce/
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- https://twitter.com/purp1ew0lf/status/1602989967776808961?s=12&t=OkZJl_ViICeiftVEsohRyw
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author: Nasreddine Bencherchali (Nextron Systems)
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date: 2022/12/22
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tags:
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- attack.initial_access
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- attack.t1190
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logsource:
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category: proxy
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detection:
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selection:
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# Look for the header: X-OWA-ExplicitLogonUser: owa/mastermailbox@outlook.com
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c-useragent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.5195.54 Safari/537.36'
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cs-method: 'POST'
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sc-status: 200
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c-uri|contains|all:
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- '/owa/mastermailbox'
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- '/powershell'
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condition: selection
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falsepositives:
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- Unlikely
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level: critical
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