Potential Credential Dumping Via WER

Severity: high
Author: @pbssubhash , Nasreddine Bencherchali
Source: upstream

Detects potential credential dumping via Windows Error Reporting LSASS Shtinkering technique which uses the Windows Error Reporting to dump lsass

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1003.001` OS Credential Dumping: LSASS Memory

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\Werfault.exe'
OriginalFileName: WerFault.exe

Stage 2: `all of selection_cli`

or:
ParentUser|contains: AUTHORI
ParentUser|contains: AUTORI
or:
User|contains: AUTHORI
User|contains: AUTORI
CommandLine|contains: ' -ip '
CommandLine|contains: ' -s '
CommandLine|contains: ' -u -p '

Stage 3: `not 1 of filter_lsass`

ParentImage: 'C:\Windows\System32\lsass.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
`CommandLine`	match	`-ip` `-s` corpus 2 (sigma 2) `-u -p` corpus 2 (sigma 2)
`Image`	ends_with	`\Werfault.exe`
`OriginalFileName`	eq	`WerFault.exe` corpus 3 (sigma 3)
`ParentImage`	eq	`C:\Windows\System32\lsass.exe`
`ParentUser`	match	`AUTHORI` corpus 2 (sigma 2) `AUTORI` corpus 2 (sigma 2)
`User`	match	`AUTHORI` corpus 16 (sigma 16) `AUTORI` corpus 16 (sigma 16)