Credential Dumping Attempt Via Svchost

Severity: high
Author: Florent Labouyrie
Source: upstream

Detects when a process tries to access the memory of svchost to potentially dump credentials.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1548` Abuse Elevation Control Mechanism
Defense Evasion	`T1548` Abuse Elevation Control Mechanism

Event coverage

Provider	Event ID	Title
Sysmon	10	ProcessAccess

Stages and Predicates

Stage 1: `selection`

GrantedAccess: 0x143a
TargetImage|endswith: '\svchost.exe'

Stage 2: `not 1 of filter_main_known_processes`

or:
SourceImage|endswith: '\msiexec.exe'
SourceImage|endswith: '\services.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.

Field	Kind	Values
`GrantedAccess`	eq	`0x143a`
`SourceImage`	ends_with	`\msiexec.exe` corpus 21 (sigma 21) `\services.exe` corpus 3 (sigma 3)
`TargetImage`	ends_with	`\svchost.exe`