Detection rules › Sigma
Flash Player Update from Suspicious Location
Detects a flashplayer update from an unofficial location
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1189 Drive-by Compromise |
| Execution | T1204.002 User Execution: Malicious File |
| Stealth | T1036.005 Masquerading: Match Legitimate Resource Name or Location |
Rule body yaml
title: Flash Player Update from Suspicious Location
id: 4922a5dd-6743-4fc2-8e81-144374280997
status: test
description: Detects a flashplayer update from an unofficial location
references:
- https://gist.github.com/roycewilliams/a723aaf8a6ac3ba4f817847610935cfb
author: Florian Roth (Nextron Systems)
date: 2017-10-25
modified: 2022-08-08
tags:
- attack.initial-access
- attack.stealth
- attack.t1189
- attack.execution
- attack.t1204.002
- attack.t1036.005
logsource:
category: proxy
detection:
selection:
- c-uri|contains: '/flash_install.php'
- c-uri|endswith: '/install_flash_player.exe'
filter:
cs-host|endswith: '.adobe.com'
condition: selection and not filter
falsepositives:
- Unknown flash download locations
level: high
Stages and Predicates
Stage 0: condition
selection and not filterStage 1: selection
selection:
- c-uri|contains: '/flash_install.php'
- c-uri|endswith: '/install_flash_player.exe'
Stage 2: not filter
filter:
cs-host|endswith: '.adobe.com'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
cs-host | ends_with | .adobe.com |
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.