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Potential SNAKE Malware Installation CLI Arguments Indicator

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a specific command line arguments sequence seen used by SNAKE malware during its installation as described by CISA in their report

MITRE ATT&CK coverage

TacticTechniques
ExecutionNo specific technique

Event coverage

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

Rule body yaml

title: Potential SNAKE Malware Installation CLI Arguments Indicator
id: 02cbc035-b390-49fe-a9ff-3bb402c826db
status: test
description: Detects a specific command line arguments sequence seen used by SNAKE malware during its installation as described by CISA in their report
references:
    - https://media.defense.gov/2023/May/09/2003218554/-1/-1/0/JOINT_CSA_HUNTING_RU_INTEL_SNAKE_MALWARE_20230509.PDF
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-04
tags:
    - attack.execution
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        # This CLI regex is based on the following description from the report:
        #   The jpsetup.exe installer requires two arguments to be passed via the command line for execution
        #   The first argument is a wide character string hashed with SHA-256 twice -> We assume that the first argument is of length SHA256
        #   The AES initialization vector (IV) consists of the first 16 bytes of the second argument to jpsetup.exe -> We assume that the second argument is of at least 16 bytes (16 characters)
        CommandLine|re: '\s[a-fA-F0-9]{64}\s[a-fA-F0-9]{16}'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|re: '\s[a-fA-F0-9]{64}\s[a-fA-F0-9]{16}'

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
CommandLineregex_match
  • \s[a-fA-F0-9]{64}\s[a-fA-F0-9]{16}