HackTool - CrackMapExec Process Patterns

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

Detects suspicious process patterns found in logs when CrackMapExec is used

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
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `1 of selection_lsass_dump1`

or:
CommandLine|contains: 'cmd /c '
CommandLine|contains: 'cmd /k '
CommandLine|contains: 'cmd /r '
CommandLine|contains: 'cmd.exe /c '
CommandLine|contains: 'cmd.exe /k '
CommandLine|contains: 'cmd.exe /r '
or:
User|contains: AUTHORI
User|contains: AUTORI
CommandLine|contains: 'Imagename eq lsass.exe'
CommandLine|contains: 'tasklist /fi '

Stage 2: `1 of selection_lsass_dump2`

CommandLine|contains: ' full'
CommandLine|contains: '%%B'
CommandLine|contains: '\Windows\Temp\'
CommandLine|contains: 'do rundll32.exe C:\windows\System32\comsvcs.dll, MiniDump'

Stage 3: `1 of selection_procdump`

CommandLine|contains: 'findstr /i "lsass"'
CommandLine|contains: 'tasklist /v /fo csv'

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	`full` `%%B` `Imagename eq lsass.exe` `\Windows\Temp\` corpus 10 (sigma 10) `cmd /c` corpus 5 (sigma 5) `cmd /k` corpus 5 (sigma 5) `cmd /r` corpus 5 (sigma 5) `cmd.exe /c` corpus 6 (sigma 6) `cmd.exe /k` corpus 6 (sigma 6) `cmd.exe /r` corpus 6 (sigma 6) `do rundll32.exe C:\windows\System32\comsvcs.dll, MiniDump` `findstr /i "lsass"` `tasklist /fi` `tasklist /v /fo csv`
`User`	match	`AUTHORI` corpus 16 (sigma 16) `AUTORI` corpus 16 (sigma 16)