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ca09ae5039
Edited suggested searches to improve performance:
VAR+
16ms: .*cmd.*(?:\/c|\/r).*set.*(?:\{\d\}){1,}\\\"\s+?\-f(?:.*\)){1,}.*\"
6ms: .*cmd.{0,5}(?:\/c|\/r)(?:\s|)\"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\\"\s+?\-f(?:.*\)){1,}.*\"
STDIN+
7ms: .*cmd.*(?:\/c|\/r).*powershell.+(?:\$\{?input}?|noexit).*\"
3ms: .*cmd.{0,5}(?:\/c|\/r).+powershell.+(?:\$\{?input\}?|noexit).+\"
CLIP+
28ms: .*cmd.*(?:\/c|\/r).*\|.*clip(?:\.exe)?.*&&.*clipboard]::\(\s\\\"\{\d\}.*\-f.*\"
11ms: .*cmd.{0,5}(?:\/c|\/r).+clip(?:\.exe)?.{0,4}&&.+clipboard]::\(\s\\\"\{\d\}.+\-f.+\"
29 lines
961 B
YAML
29 lines
961 B
YAML
title: Invoke-Obfuscation VAR+ Launcher
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id: 0adfbc14-0ed1-11eb-adc1-0242ac120002
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description: Detects Obfuscated use of Environment Variables to execute PowerShell
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status: experimental
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author: Jonathan Cheong, oscd.community
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date: 2020/10/15
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references:
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- https://github.com/Neo23x0/sigma/issues/1009 #(Task 24)
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tags:
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- attack.defense_evasion
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- attack.t1027
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- attack.execution
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- attack.t1059.001
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logsource:
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product: windows
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service: powershell
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detection:
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selection_1:
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EventID: 4104
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selection_2:
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- ScriptBlockText|re: '.*cmd.{0,5}(?:\/c|\/r)(?:\s|)\"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\\"\s+?\-f(?:.*\)){1,}.*\"'
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selection_3:
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EventID: 4103
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selection_4:
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- Payload|re: '.*cmd.{0,5}(?:\/c|\/r)(?:\s|)\"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\\"\s+?\-f(?:.*\)){1,}.*\"'
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condition: ( selection_1 and selection_2 ) or ( selection_3 and selection_4 )
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falsepositives:
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- Unknown
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level: high |