HackTool - CrackMapExec Execution

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

This rule detect common flag combinations used by CrackMapExec in order to detect its use even if the binary has been replaced.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1047` Windows Management Instrumentation, `T1053` Scheduled Task/Job, `T1059.001` Command and Scripting Interpreter: PowerShell, `T1059.003` Command and Scripting Interpreter: Windows Command Shell
Persistence	`T1053` Scheduled Task/Job
Privilege Escalation	`T1053` Scheduled Task/Job
Credential Access	`T1110` Brute Force
Discovery	`T1201` Password Policy Discovery

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_binary`

Image|endswith: '\crackmapexec.exe'

Stage 2: `1 of selection_special`

CommandLine|contains: ' -M pe_inject '

Stage 3: `1 of selection_execute`

CommandLine|contains: ' --local-auth'
CommandLine|contains: ' -u '
CommandLine|contains: ' -x '

Stage 4: `1 of selection_hash`

CommandLine|contains: ' --local-auth'
CommandLine|contains: ' -H ''NTHASH'''
CommandLine|contains: ' -p '
CommandLine|contains: ' -u '

Stage 5: `1 of selection_module_mssql`

CommandLine|contains: ' -M '
CommandLine|contains: ' -d '
CommandLine|contains: ' -p '
CommandLine|contains: ' -u '
CommandLine|contains: ' mssql '

Stage 6: `1 of selection_module_smb1`

CommandLine|contains: ' -H '
CommandLine|contains: ' -M '
CommandLine|contains: ' -o '
CommandLine|contains: ' -u '
CommandLine|contains: ' smb '

Stage 7: `1 of selection_module_smb2`

CommandLine|contains: ' --local-auth'
CommandLine|contains: ' -p '
CommandLine|contains: ' -u '
CommandLine|contains: ' smb '

Stage 8: `all of part_localauth_1`

CommandLine|contains: ' --local-auth'
CommandLine|contains: ' -p '
CommandLine|contains: ' -u '

Stage 9: `all of part_localauth_2`

CommandLine|contains: ' 10.'
CommandLine|contains: ' 192.168.'
CommandLine|contains: '/24 '

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	`--local-auth` `-H` `-H 'NTHASH'` `-M` `-M pe_inject` `-d` corpus 6 (sigma 6) `-o` corpus 2 (sigma 2) `-p` corpus 5 (sigma 5) `-u` corpus 4 (sigma 4) `-x` `10.` `192.168.` `mssql` corpus 2 (sigma 2) `smb` corpus 2 (sigma 2) `/24`
`Image`	ends_with	`\crackmapexec.exe` corpus 2 (sigma 2)

HackTool - CrackMapExec Execution

MITRE ATT&CK coverage

Event coverage

Stages and Predicates

Stage 1: 1 of selection_binary

Stage 2: 1 of selection_special

Stage 3: 1 of selection_execute

Stage 4: 1 of selection_hash

Stage 5: 1 of selection_module_mssql

Stage 6: 1 of selection_module_smb1

Stage 7: 1 of selection_module_smb2

Stage 8: all of part_localauth_1

Stage 9: all of part_localauth_2