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Detection rules › Sigma

Potential Conti Ransomware Activity

Status
test
Severity
critical
Log source
product windows, category process_creation
Author
frack113
Source
github.com/SigmaHQ/sigma

Detects a specific command used by the Conti ransomware group

MITRE ATT&CK coverage

TacticTechniques
ImpactT1486 Data Encrypted for Impact

Event coverage

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

Rule body yaml

title: Potential Conti Ransomware Activity
id: 689308fc-cfba-4f72-9897-796c1dc61487
status: test
description: Detects a specific command used by the Conti ransomware group
references:
    - https://news.sophos.com/en-us/2021/09/03/conti-affiliates-use-proxyshell-exchange-exploit-in-ransomware-attacks/
    - https://twitter.com/VK_Intel/status/1447795359900704769?t=Xz7vaLTvaaCZ5kHoZa6gMw&s=19
author: frack113
date: 2021-10-12
modified: 2023-02-13
tags:
    - attack.impact
    - attack.s0575
    - attack.t1486
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '-m '
            - '-net '
            - '-size ' # Size 10 in references
            - '-nomutex '
            - '-p \\\\'
            - '$'
    condition: selection
falsepositives:
    - Unlikely
level: critical

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - '-m '
        - '-net '
        - '-size '
        - '-nomutex '
        - '-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.

FieldKindValues
CommandLinematch
  • $
  • -m corpus 4 (sigma 4)
  • -net
  • -nomutex
  • -p \\\\
  • -size