Emerging Threatcriticaltest
Potential Emotet Rundll32 Execution
Detecting Emotet DLL loading by looking for rundll32.exe processes with command lines ending in ,RunDLL or ,Control_RunDLL
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Launch
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic4 selectors
detection:
selection_img:
- Image|endswith: '\rundll32.exe'
- OriginalFileName: 'RUNDLL32.EXE'
selection_cli:
CommandLine|endswith:
- ',RunDLL'
- ',Control_RunDLL'
# - ',#1' too generic - function load by ordinal is not Emotet specific
filter_legitimate_dll:
CommandLine|endswith:
- '.dll,Control_RunDLL'
- '.dll",Control_RunDLL'
- '.dll'',Control_RunDLL'
filter_ide:
ParentImage|endswith: '\tracker.exe' # When Visual Studio compile NodeJS program, it might use MSBuild to create tracker.exe and then, the tracker.exe fork rundll32.exe
condition: all of selection_* and not 1 of filter_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Rule Metadata
Rule ID
54e57ce3-0672-46eb-a402-2c0948d5e3e9
Status
test
Level
critical
Type
Emerging Threat
Created
Fri Dec 25
Modified
Tue Feb 21
Author
Path
rules-emerging-threats/2020/Malware/Emotet/proc_creation_win_malware_emotet_rundll32_execution.yml
Raw Tags
attack.defense-evasionattack.t1218.011detection.emerging-threats