Detectionmediumtest
File Download Via InstallUtil.EXE
Detects use of .NET InstallUtil.exe in order to download arbitrary files. The files will be written to "%LOCALAPPDATA%\Microsoft\Windows\INetCache\IE\"
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Nasreddine Bencherchali (Nextron Systems)Created Fri Aug 19Updated Thu Nov 0975edd216-1939-4c73-8d61-7f3a0d85b5ccwindows
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 Logic2 selectors
detection:
selection_img:
- Image|endswith: '\InstallUtil.exe'
- OriginalFileName: 'InstallUtil.exe'
selection_cli:
CommandLine|contains:
- 'ftp://'
- 'http://'
- 'https://'
condition: all of selection_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Techniques
Rule Metadata
Rule ID
75edd216-1939-4c73-8d61-7f3a0d85b5cc
Status
test
Level
medium
Type
Detection
Created
Fri Aug 19
Modified
Thu Nov 09
Path
rules/windows/process_creation/proc_creation_win_installutil_download.yml
Raw Tags
attack.defense-evasionattack.t1218