Detection rules › Sigma
Flash Player Update from Suspicious Location
Detects a flashplayer update from an unofficial location
Known false positives
- Unknown flash download locations
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Execution | |
| Stealth |
Rule body
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
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
cs-host | ends_with | .adobe.com | excludes:cs-host field:"cs-host" value:".adobe.com" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
c-uri | ends_with |
| field:"c-uri" kind:ends_with value:"/install_flash_player.exe" |
c-uri | match |
| field:"c-uri" kind:match value:"/flash_install.php" |