Detectionmediumtest
Uncommon Extension Shim Database Installation Via Sdbinst.EXE
Detects installation of a potentially suspicious new shim with an uncommon extension using sdbinst.exe. Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by application shims
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Nasreddine Bencherchali (Nextron Systems)Created Tue Aug 01Updated Wed Jan 1018ee686c-38a3-4f65-9f44-48a077141f42windows
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 Logic5 selectors
detection:
selection:
- Image|endswith: '\sdbinst.exe'
- OriginalFileName: 'sdbinst.exe'
filter_main_legit_ext:
CommandLine|contains: '.sdb'
filter_main_legit_extensions:
# ParentImage|endswith: ':\Windows\System32\svchost.exe'
- CommandLine|endswith:
- ' -c'
- ' -f'
- ' -mm'
- ' -t'
- CommandLine|contains: ' -m -bg'
filter_main_null:
CommandLine: null
filter_main_empty:
CommandLine: ''
condition: selection and not 1 of filter_main_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Sub-techniques
Rule Metadata
Rule ID
18ee686c-38a3-4f65-9f44-48a077141f42
Status
test
Level
medium
Type
Detection
Created
Tue Aug 01
Modified
Wed Jan 10
Path
rules/windows/process_creation/proc_creation_win_sdbinst_susp_extension.yml
Raw Tags
attack.persistenceattack.privilege-escalationattack.t1546.011