SigmaHQ/rules/windows/process_creation/win_apt_bluemashroom.yml

title: BlueMashroom DLL Load
id: bd70d3f8-e60e-4d25-89f0-0b5a9cff20e0
status: experimental
description: Detects a suspicious DLL loading from AppData Local path as described in BlueMashroom report
references:
    - https://www.virusbulletin.com/conference/vb2019/abstracts/apt-cases-exploiting-vulnerabilities-region-specific-software
tags:
    - attack.defense_evasion
    - attack.t1117 # an old one
    - attack.t1218.010
author: Florian Roth
date: 2019/10/02
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine:
            - '*\regsvr32*\AppData\Local\\*'
            - '*\AppData\Local\\*,DllEntry*'
    condition: selection
falsepositives:
    - Unlikely
level: critical
fix: fixed typo in APT group name 2019-10-02 12:02:07 +00:00			`title: BlueMashroom DLL Load`
Added UUIDs to rules 2019-11-12 22:12:27 +00:00			`id: bd70d3f8-e60e-4d25-89f0-0b5a9cff20e0`
rule: APT blue mushroom 2019-10-02 11:57:14 +00:00			`status: experimental`
fix: fixed typo in APT group name 2019-10-02 12:02:07 +00:00			`description: Detects a suspicious DLL loading from AppData Local path as described in BlueMashroom report`
rule: APT blue mushroom 2019-10-02 11:57:14 +00:00			`references:`
Added UUIDs to rules 2019-11-12 22:12:27 +00:00			`- https://www.virusbulletin.com/conference/vb2019/abstracts/apt-cases-exploiting-vulnerabilities-region-specific-software`
rule: APT blue mushroom 2019-10-02 11:57:14 +00:00			`tags:`
			`- attack.defense_evasion`
att&ck tags review: windows/process_creation part 1, network 2020-08-27 17:43:47 +00:00			`- attack.t1117 # an old one`
Initial round of subtechnique updates 2020-06-16 20:46:08 +00:00			`- attack.t1218.010`
rule: APT blue mushroom 2019-10-02 11:57:14 +00:00			`author: Florian Roth`
			`date: 2019/10/02`
			`logsource:`
			`category: process_creation`
			`product: windows`
			`detection:`
			`selection:`
Initial round of subtechnique updates 2020-06-16 20:46:08 +00:00			`CommandLine:`
fix: fixed typo in bluemashroom rule 2019-10-02 13:45:55 +00:00			`- '\regsvr32\AppData\Local\\*'`
Fixed wrong backslash escaping of * Fixes issue #466 2019-10-07 20:09:53 +00:00			`- '\AppData\Local\\,DllEntry*'`
rule: APT blue mushroom 2019-10-02 11:57:14 +00:00			`condition: selection`
			`falsepositives:`
			`- Unlikely`
			`level: critical`