IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
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: 1
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/