detection.wiki

Detection rules › Sigma

HackTool - CrackMapExec Execution Patterns

Status
stable
Severity
high
Log source
product windows, category process_creation
Author
Thomas Patzke
Source
github.com/SigmaHQ/sigma

Detects various execution patterns of the CrackMapExec pentesting framework

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1047 Windows Management Instrumentation, T1053 Scheduled Task/Job, T1059.001 Command and Scripting Interpreter: PowerShell, T1059.003 Command and Scripting Interpreter: Windows Command Shell
PersistenceT1053 Scheduled Task/Job
Privilege EscalationT1053 Scheduled Task/Job

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: HackTool - CrackMapExec Execution Patterns
id: 058f4380-962d-40a5-afce-50207d36d7e2
status: stable
description: Detects various execution patterns of the CrackMapExec pentesting framework
references:
    - https://github.com/byt3bl33d3r/CrackMapExec
author: Thomas Patzke
date: 2020-05-22
modified: 2023-11-06
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.t1047
    - attack.t1053
    - attack.t1059.003
    - attack.t1059.001
    - attack.s0106
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains:
            # cme/protocols/smb/wmiexec.py (generalized execute_remote and execute_fileless)
            - 'cmd.exe /Q /c * 1> \\\\*\\*\\* 2>&1'
            # cme/protocols/smb/atexec.py:109 (fileless output via share)
            - 'cmd.exe /C * > \\\\*\\*\\* 2>&1'
            # cme/protocols/smb/atexec.py:111 (fileless output via share)
            - 'cmd.exe /C * > *\\Temp\\* 2>&1'
            # https://github.com/byt3bl33d3r/CrackMapExec/blob/d8c50c8cbaf36c29329078662473f75e440978d2/cme/helpers/powershell.py#L136 (PowerShell execution with obfuscation)
            - 'powershell.exe -exec bypass -noni -nop -w 1 -C "'
            # https://github.com/byt3bl33d3r/CrackMapExec/blob/d8c50c8cbaf36c29329078662473f75e440978d2/cme/helpers/powershell.py#L160 (PowerShell execution without obfuscation)
            - 'powershell.exe -noni -nop -w 1 -enc '
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains:
        - 'cmd.exe /Q /c * 1> \\\\*\\*\\* 2>&1'
        - 'cmd.exe /C * > \\\\*\\*\\* 2>&1'
        - 'cmd.exe /C * > *\\Temp\\* 2>&1'
        - 'powershell.exe -exec bypass -noni -nop -w 1 -C "'
        - 'powershell.exe -noni -nop -w 1 -enc '

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.

FieldKindValues
CommandLinematch
  • cmd.exe /C * > *\\Temp\\* 2>&1
  • cmd.exe /C * > \\\\*\\*\\* 2>&1
  • cmd.exe /Q /c * 1> \\\\*\\*\\* 2>&1
  • powershell.exe -exec bypass -noni -nop -w 1 -C "
  • powershell.exe -noni -nop -w 1 -enc