New Generic Credentials Added Via Cmdkey.EXE

Severity: medium
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects usage of "cmdkey.exe" to add generic credentials. As an example, this can be used before connecting to an RDP session via command line interface.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1003.005` OS Credential Dumping: Cached Domain Credentials

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\cmdkey.exe'
OriginalFileName: cmdkey.exe

Stage 2: `all of selection_cli_generic`

CommandLine|contains: ' -g'

Stage 3: `all of selection_cli_user`

CommandLine|contains: ' -u'

Stage 4: `all of selection_cli_password`

CommandLine|contains: ' -p'

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	`-g` corpus 2 (sigma 2) `-p` corpus 2 (sigma 2) `-u`
`Image`	ends_with	`\cmdkey.exe` corpus 3 (sigma 3)
`OriginalFileName`	eq	`cmdkey.exe` corpus 2 (sigma 2)

New Generic Credentials Added Via Cmdkey.EXE

MITRE ATT&CK coverage

Event coverage

Stages and Predicates

Stage 1: all of selection_img

Stage 2: all of selection_cli_generic

Stage 3: all of selection_cli_user

Stage 4: all of selection_cli_password

Indicators

Stage 1: `all of selection_img`

Stage 2: `all of selection_cli_generic`

Stage 3: `all of selection_cli_user`

Stage 4: `all of selection_cli_password`