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Detection rules › Sigma

Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32

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

Detects potential BlueMushroom DLL loading activity via regsvr32 from AppData Local

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 1: Process creation
Security-AuditingEvent ID 4688: A new process has been created.

Rule body

title: Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32
id: bd70d3f8-e60e-4d25-89f0-0b5a9cff20e0
status: test
description: Detects potential BlueMushroom DLL loading activity via regsvr32 from AppData Local
references:
    - https://pbs.twimg.com/media/EF3yLGoWkAEGeLa?format=jpg
author: Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-02
modified: 2023-03-29
tags:
    - attack.stealth
    - attack.t1218.010
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - 'regsvr32'
            - '\AppData\Local\'
            - '.dll'
            - ',DllEntry'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - 'regsvr32'
        - '\AppData\Local\'
        - '.dll'
        - ',DllEntry'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • ,DllEntry
  • .dll corpus 16 (sigma 16)
  • \AppData\Local\ corpus 11 (sigma 10, elastic 1)
  • regsvr32 corpus 15 (sigma 15)
field:"CommandLine" kind:match