Suspicious Windows Powershell Arguments
editSuspicious Windows Powershell Arguments
editIdentifies the execution of PowerShell with suspicious argument values. This behavior is often observed during malware installation leveraging PowerShell.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-windows.*
- logs-system.security*
- logs-windows.sysmon_operational-*
- logs-sentinel_one_cloud_funnel.*
- logs-m365_defender.event-*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Execution
- Data Source: System
- Data Source: Sysmon
- Data Source: SentinelOne
- Data Source: Microsoft Defender for Endpoint
Version: 201
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editprocess where host.os.type == "windows" and event.type == "start" and process.name : "powershell.exe" and ( process.command_line : ( "*^*^*^*^*^*^*^*^*^*", "*`*`*`*`*", "*+*+*+*+*+*+*", "*[char[]](*)*-join*", "*Base64String*", "*[*Convert]*", "*.Compression.*", "*-join($*", "*.replace*", "*MemoryStream*", "*WriteAllBytes*", "* -enc *", "* -ec *", "* /e *", "* /enc *", "* /ec *", "*WebClient*", "*DownloadFile*", "*DownloadString*", "* iex*", "* iwr*", "*Reflection.Assembly*", "*Assembly.GetType*", "*$env:temp\\*start*", "*powercat*", "*nslookup -q=txt*", "*$host.UI.PromptForCredential*", "*Net.Sockets.TCPClient*", "*curl *;Start*", "powershell.exe \"<#*", "*ssh -p *", "*http*|iex*", "*@SSL\\DavWWWRoot\\*.ps1*", "*.lnk*.Seek(0x*", "*[string]::join(*", "*[Array]::Reverse($*", "* hidden $(gc *", "*=wscri& set*", "*http'+'s://*", "*.content|i''Ex*", "*//:sptth*", "*//:ptth*", "*$*=Get-Content*AppData*.SubString(*$*", "*=cat *AppData*.substring(*);*$*" ) or (process.args : "-c" and process.args : "&{'*") or (process.args : "-Outfile" and process.args : "Start*") or (process.args : "-bxor" and process.args : "0x*") or process.args : "$*$*;set-alias" or (process.parent.name : ("explorer.exe", "cmd.exe") and process.command_line : ("*-encodedCommand*", "*Invoke-webrequest*", "*WebClient*", "*Reflection.Assembly*")) )
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
-
Sub-technique:
- Name: PowerShell
- ID: T1059.001
- Reference URL: https://attack.mitre.org/techniques/T1059/001/