Detectionhightest
Suspicious CustomShellHost Execution
Detects the execution of CustomShellHost.exe where the child isn't located in 'C:\Windows\explorer.exe'. CustomShellHost is a known LOLBin that can be abused by attackers for defense evasion techniques.
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Launch
Nasreddine Bencherchali (Nextron Systems)Created Fri Aug 19Updated Wed Oct 2984b14121-9d14-416e-800b-f3b829c5a14dwindows
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:
ParentImage|endswith: '\CustomShellHost.exe'
filter_main_explorer:
Image: 'C:\Windows\explorer.exe'
condition: selection and not 1 of filter_main_*False Positives
False positives are unlikely, investigate matches carefully.
MITRE ATT&CK
Tactics
Techniques
Rule Metadata
Rule ID
84b14121-9d14-416e-800b-f3b829c5a14d
Status
test
Level
high
Type
Detection
Created
Fri Aug 19
Modified
Wed Oct 29
Path
rules/windows/process_creation/proc_creation_win_customshellhost_susp_exec.yml
Raw Tags
attack.defense-evasionattack.t1216