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45 lines
1.6 KiB
YAML
45 lines
1.6 KiB
YAML
name: Powershell Processing Stream Of Data
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id: 0d718b52-c9f1-11eb-bc61-acde48001122
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version: 1
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date: '2021-06-10'
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author: Teoderick Contreras, Splunk
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type: batch
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datamodel:
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- Endpoint
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description: this search is to detect suspicious powershell that processing compressed
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stream data. This technique was seen in obfuscated powershell or powershell with
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embedded .net or binary files that are stream flated and will be deflated during
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execution.
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search: '`powershell` EventCode=4104 Message = "*IO.Compression.*" OR Message = "*IO.StreamReader*"
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OR Message = "*]::Decompress*" | stats count min(_time) as firstTime max(_time)
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as lastTime by EventCode Message ComputerName User | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `powershell_processing_stream_of_data_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the powershell logs from your endpoints. make sure you enable needed
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registry to monitor this event.
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known_false_positives: powershell may used this function to process compressed data.
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references:
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- https://medium.com/@ahmedjouini99/deobfuscating-emotets-powershell-payload-e39fb116f7b9
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tags:
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analytic_story:
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- Malicious PowerShell
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1059.001
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- EventCode
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- Message
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- ComputerName
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- User
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- Score
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security_domain: endpoint
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automated_detection_testing: passed
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/honeypots/pwsh/windows-powershell.log
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