# Query for Unusual Instances of rundll32.exe making outbound network connections using SysMon Data

```
#####aid_begin
#description: identifies unusual instances of rundll32.exe making outbound network connections using sysmon
#id: aid2201251645
#processtype: query
#category: network
#sourcelink: <na>
#tacticidlist: <na>
#techniqueidlist: <na>
#compatibleos: |-
#  windows 7
#  windows 8.*
#  windows 10
#  windows 11
#  windows server 2008 r2
#  windows server 2012
#  windows server 2012 r2
#  windows server 2016
#  windows server 2019
#compatibleengine: |-
#  powershell 2
#  powershell 3
#  powershell 4
#  powershell 5.*
#  powershell 7.*
#bgcommandlist: |-
#  format-bgevent
#  1) get the sysmon envent log where id 3
#  2) query to get the identifies unusual instances of rundll32.exe making outbound network connections using sysmon.
#notes: |- 
#  adversaries may abuse rundll32.exe to proxy execution of malicious code. this may indicate adversarial command and control activity.
#   o event source: sysmon
#   o schema used: "sysmon.schema"
#   o event dataset: "microsoft-windows-sysmon/operational"
#   o eventid's: '3'
#####aid_end
commands:
- Format-BGEvent -Event "Microsoft-Windows-Sysmon/operational" -PropsOnly -MaxEvents 5000 -ID '3' -Schema "$('{0}\Blubin\Modules\BluGenie\Configs\Schema\Sysmon_1.Schema' -f $ScriptDirectory)" -EQLQuery "generic where true" -EQLQuery "generic where true"
- Format-BGEvent -UseInputFile "Last:" -EQLQuery "generic where EventId in (3) and process_name == '*\\rundll32.exe' and not cidrMatch(destination_ip, '10.0.0.0/8', '127.0.0.0/8', '169.254.0.0/16', '172.16.0.0/12', '192.0.0.0/24', '192.0.0.0/29', '192.0.0.8/32', '192.0.0.9/32', '192.0.0.10/32', '192.0.0.170/32', '192.0.0.171/32', '192.0.2.0/24', '192.31.196.0/24', '192.52.193.0/24', '192.168.0.0/16', '192.88.99.0/24', '224.0.0.0/4', '100.64.0.0/10', '192.175.48.0/24', '198.18.0.0/15', '198.51.100.0/24', '203.0.113.0/24', '240.0.0.0/4')"
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://manuals.blusapphire.io/blugenie/artifacts/tactical-artifacts-by-category/eventlog-query/query-for-unusual-instances-of-rundll32.exe-making-outbound-network-connections-using-sysmon-data.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.