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44 lines
1.3 KiB
YAML
44 lines
1.3 KiB
YAML
title: Suspicious Werfault.exe Network Connection Outbound
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id: e12c75f2-d09e-43f6-90e4-6a23842907af
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status: experimental
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description: Adversaries can migrate cobalt strike/metasploit/C2 beacons on compromised systems to legitimate werfault.exe process to avoid detection.
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references:
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- https://thedfirreport.com/2021/03/08/bazar-drops-the-anchor/
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author: Sreeman
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date: 2021/03/09
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modified: 2021/06/11
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tags:
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- attack.command_and_control
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- attack.t1571
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logsource:
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product: windows
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category: network_connection
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detection:
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selection:
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Image: 'werfault.exe'
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filter1:
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ParentImage: 'svchost.exe'
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filter2:
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DestinationIp:
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- '104.42.151.234'
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- '104.43.193.48'
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- '52.255.188.83'
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- '13.64.90.137'
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- '168.61.161.212'
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- '13.88.21.125'
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- '40.88.32.150'
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- '52.147.198.201'
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- '52.239.207.100'
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- '52.176.224.96'
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- '2607:7700:0:24:0:1:287e:1894'
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- '10.*'
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- '192.168.*'
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- '127.*'
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filter3:
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DestinationHostname|contains:
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- '*.windowsupdate.com'
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- '*.microsoft.com'
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condition: selection and not ( filter1 and filter2 and filter3 )
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falsepositives:
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- Communication to other corporate systems that use IP addresses from public address spaces and Microsoft IP spaces
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level: medium |