Suspicious Rundll32 Execution With Image Extension Detection Scenario by sigmahq | CrowdSec Hub

Suspicious Rundll32 Execution With Image Extension

Attack scenariowindows:auditMITRE T1218.011

By: sigmahq
Version: 0.2
Name: sigmahq/proc_creation_win_rundll32_susp_execution_with_image_extension
Remediation: Alert only

Detects the execution of Rundll32.exe with DLL files masquerading as image files

Install with a top-level collection

1 collection include it

sudo cscli collections install sigmahq/windows_proc_creation

Installs 1 parser and 520 scenarios.

View Windows - Suspicious Process Detection →

Installation

sudo cscli scenarios install sigmahq/proc_creation_win_rundll32_susp_execution_with_image_extension

Then reload CrowdSec: sudo systemctl reload crowdsec

Configuration

Hover a line or a note to see what each field does.

scenarios/sigmahq/proc_creation_win_rundll32_susp_execution_with_image_extension.yml· 23 linesGitHub

1type: trigger1
2name: sigmahq/proc_creation_win_rundll32_susp_execution_with_image_extension
3description: |
4  Detects the execution of Rundll32.exe with DLL files masquerading as image files
5filter: |2
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image endsWith '\\rundll32.exe' || evt.Parsed.OriginalFileName == 'RUNDLL32.exe') && (evt.Parsed.CommandLine contains '.bmp' || evt.Parsed.CommandLine contains '.cr2' || evt.Parsed.CommandLine contains '.eps' || evt.Parsed.CommandLine contains '.gif' || evt.Parsed.CommandLine contains '.ico' || evt.Parsed.CommandLine contains '.jpeg' || evt.Parsed.CommandLine contains '.jpg' || evt.Parsed.CommandLine contains '.nef' || evt.Parsed.CommandLine contains '.orf' || evt.Parsed.CommandLine contains '.png' || evt.Parsed.CommandLine contains '.raw' || evt.Parsed.CommandLine contains '.sr2' || evt.Parsed.CommandLine contains '.tif' || evt.Parsed.CommandLine contains '.tiff'))
7blackhole: 2m3
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:4
14   - attack.t1218.011
15
16  label: "Suspicious Rundll32 Execution With Image Extension"
17  behavior : "windows:audit"
18  remediation: false5
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23

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