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HTTP Executable Files Downloaded

Query

# Executable File Extentions downloaded via HTTP GET
----
### Defender For Endpoint

```
let ExecutableFileExtentions = dynamic(['bat', 'cmd', 'com', 'cpl', 'ex', 'exe', 'jse', 'lnk','msc', 'ps1', 'reg', 'vb', 'vbe', 'ws', 'wsf']);
DeviceNetworkEvents
| where ActionType == "NetworkSignatureInspected"
| extend
     SignatureName = tostring(parse_json(AdditionalFields).SignatureName),
     SignatureMatchedContent = tostring(parse_json(AdditionalFields).SignatureMatchedContent),
     SamplePacketContent = tostring(parse_json(AdditionalFields).SamplePacketContent)
| where SignatureName == "HTTP_Client"
| extend HTTP_Request_Method = tostring(split(SignatureMatchedContent, " /", 0)[0])
| where HTTP_Request_Method == "GET"
| extend DownloadedContent = extract(@'.*/(.*)HTTP', 1, SignatureMatchedContent)
| extend DownloadContentFileExtention = extract(@'.*\.(.*)$', 1, DownloadedContent)
| where isnotempty(DownloadContentFileExtention) and string_size(DownloadContentFileExtention) < 8
| where DownloadContentFileExtention has_any (ExecutableFileExtentions)
| project-reorder Timestamp, DeviceName, DownloadedContent, HTTP_Request_Method, RemoteIP
```
### Sentinel
```
let ExecutableFileExtentions = dynamic(['bat', 'cmd', 'com', 'cpl', 'ex', 'exe', 'jse', 'lnk','msc', 'ps1', 'reg', 'vb', 'vbe', 'ws', 'wsf']);
DeviceNetworkEvents
| where ActionType == "NetworkSignatureInspected"
| extend
     SignatureName = tostring(parse_json(AdditionalFields).SignatureName),
     SignatureMatchedContent = tostring(parse_json(AdditionalFields).SignatureMatchedContent),
     SamplePacketContent = tostring(parse_json(AdditionalFields).SamplePacketContent)
| where SignatureName == "HTTP_Client"
| extend HTTP_Request_Method = tostring(split(SignatureMatchedContent, " /", 0)[0])
| where HTTP_Request_Method == "GET"
| extend DownloadedContent = extract(@'.*/(.*)HTTP', 1, SignatureMatchedContent)
| extend DownloadContentFileExtention = extract(@'.*\.(.*)$', 1, DownloadedContent)
| where isnotempty(DownloadContentFileExtention) and string_size(DownloadContentFileExtention) < 8
| where DownloadContentFileExtention has_any (ExecutableFileExtentions)
| project-reorder TimeGenerated, DeviceName, DownloadedContent, HTTP_Request_Method, RemoteIP
```

Explanation

The query is looking for executable file extensions that are downloaded via HTTP GET requests. It filters network events where the action type is "NetworkSignatureInspected" and the signature name is "HTTP_Client". It then extracts the downloaded content and its file extension, and filters for file extensions that are in a predefined list of executable file extensions. The query returns the timestamp, device name, downloaded content, HTTP request method, and remote IP address.

Details

Bert-Jan Pals profile picture

Bert-Jan Pals

Released: February 14, 2023

Tables

DeviceNetworkEvents

Keywords

Devices,Intune,User,HTTP,GET,ExecutableFileExtensions,DefenderForEndpoint,Sentinel

Operators

whereextendtostringparse_jsonsplitextractisnotemptystring_sizehas_anyproject-reorder

Actions