Potential Password Spraying Attempt Using Dsacls.EXE

Severity: medium
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects possible password spraying attempts using Dsacls

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1218` System Binary Proxy Execution

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\dsacls.exe'
OriginalFileName: DSACLS.EXE

Stage 2: `all of selection_cli`

CommandLine|contains: '/passwd:'
CommandLine|contains: '/user:'

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	`/passwd:` `/user:` corpus 3 (sigma 3)
`Image`	ends_with	`\dsacls.exe` corpus 2 (sigma 2)
`OriginalFileName`	eq	`DSACLS.EXE` corpus 2 (sigma 2)