File Creation In Suspicious Directory By Msdt.EXE

Severity: high
Author: Vadim Varganov, Florian Roth (Nextron Systems)
Source: upstream

Detects msdt.exe creating files in suspicious directories which could be a sign of exploitation of either Follina or Dogwalk vulnerabilities

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1547.001` Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder
Privilege Escalation	`T1547.001` Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

or:
TargetFilename|contains: 'C:\PerfLogs\'
TargetFilename|contains: 'C:\ProgramData\'
TargetFilename|contains: 'C:\Users\Public\'
TargetFilename|contains: '\Desktop\'
TargetFilename|contains: '\Start Menu\Programs\Startup\'
Image|endswith: '\msdt.exe'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.