Detectionhightest

Suspicious HH.EXE Execution

Detects a suspicious execution of a Microsoft HTML Help (HH.exe)

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Maxim PavluninCreated Wed Apr 01Updated Wed Apr 12e8a95b5e-c891-46e2-b33a-93937d3abc31windows
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:
        - OriginalFileName: 'HH.exe'
        - Image|endswith: '\hh.exe'
    selection_paths:
        CommandLine|contains:
            - '.application'
            - '\AppData\Local\Temp\'
            - '\Content.Outlook\'
            - '\Downloads\'
            - '\Users\Public\'
            - '\Windows\Temp\'
            # - '\AppData\Local\Temp\Temp?_'
            # - '\AppData\Local\Temp\Rar$'
            # - '\AppData\Local\Temp\7z'
            # - '\AppData\Local\Temp\wz'
            # - '\AppData\Local\Temp\peazip-tmp'
    condition: all of selection_*
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

Rule Metadata
Rule ID
e8a95b5e-c891-46e2-b33a-93937d3abc31
Status
test
Level
high
Type
Detection
Created
Wed Apr 01
Modified
Wed Apr 12
Path
rules/windows/process_creation/proc_creation_win_hh_susp_execution.yml
Raw Tags
attack.defense-evasionattack.executionattack.initial-accessattack.t1047attack.t1059.001attack.t1059.003attack.t1059.005attack.t1059.007attack.t1218attack.t1218.001attack.t1218.010attack.t1218.011attack.t1566attack.t1566.001
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