KQL Search

# Encoded Powershell Executions by Device

## Query Information

#### MITRE ATT&CK Technique(s)

| Technique ID | Title    | Link    |
| ---  | --- | --- |
| T1027 | Obfuscated Files or Information |https://attack.mitre.org/techniques/T1027/ |

## Defender For Endpoint
```
let EncodedList = dynamic(['-encodedcommand', '-enc']); 
// For more results use line below en filter one above. This will also return more FPs.
// let EncodedList = dynamic(['-encodedcommand', '-enc', '-e']);
let TimeFrame = 48h; //Customizable h = hours, d = days
DeviceProcessEvents
| where Timestamp > ago(TimeFrame)
| where ProcessCommandLine contains "powershell" or InitiatingProcessCommandLine contains "powershell"
| where ProcessCommandLine has_any (EncodedList) or InitiatingProcessCommandLine has_any (EncodedList)
| extend base64String = extract(@'\s+([A-Za-z0-9+/]{20}\S+$)', 1, ProcessCommandLine)
| extend DecodedCommandLine = base64_decode_tostring(base64String)
| where not(isempty(base64String) and isempty(DecodedCommandLine))
| summarize TotalEncodedExecutions = count() by DeviceName
| sort by TotalEncodedExecutions
```
## Sentinel
```
let EncodedList = dynamic(['-encodedcommand', '-enc']); 
// For more results use line below en filter one above. This will also return more FPs.
// let EncodedList = dynamic(['-encodedcommand', '-enc', '-e']);
let TimeFrame = 48h; //Customizable h = hours, d = days
DeviceProcessEvents
| where TimeGenerated > ago(TimeFrame)
| where ProcessCommandLine contains "powershell" or InitiatingProcessCommandLine contains "powershell"
| where ProcessCommandLine has_any (EncodedList) or InitiatingProcessCommandLine has_any (EncodedList)
| extend base64String = extract(@'\s+([A-Za-z0-9+/]{20}\S+$)', 1, ProcessCommandLine)
| extend DecodedCommandLine = base64_decode_tostring(base64String)
| where not(isempty(base64String) and isempty(DecodedCommandLine))
| summarize TotalEncodedExecutions = count() by DeviceName
| sort by TotalEncodedExecutions
```