IcedID Malware Suspicious Single Digit DLL Execution Via Rundll32
Detects RunDLL32.exe executing a single digit DLL named "1.dll" with the export function "DllRegisterServer". This behaviour was often seen used by malware and especially IcedID
Detection logic
selection
Image|endswith: \rundll32.exe
CommandLine|endswith:
- \1.dll, DllRegisterServer
- " 1.dll, DllRegisterServer"Condition
selectionRaw YAML
title: IcedID Malware Suspicious Single Digit DLL Execution Via Rundll32
id: 2bd8e100-5b3b-4b6a-bbb5-b129d3ddddc5
status: test
description: Detects RunDLL32.exe executing a single digit DLL named "1.dll" with the export function "DllRegisterServer". This behaviour was often seen used by malware and especially IcedID
references:
- https://thedfirreport.com/2023/05/22/icedid-macro-ends-in-nokoyawa-ransomware/
- https://thedfirreport.com/2023/08/28/html-smuggling-leads-to-domain-wide-ransomware/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-31
tags:
- attack.stealth
- attack.t1218.011
- detection.emerging-threats
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith: '\rundll32.exe'
CommandLine|endswith:
- '\1.dll, DllRegisterServer' # In case of full path exec
- ' 1.dll, DllRegisterServer' # In case of direct exec
condition: selection
falsepositives:
- Unknown
level: highFalse positives
- Unknown