Secure your S3 bucket using Alienvault

Hunting malware in your s3 bucket by using Alienvault threat intelligence source. Have prevention and detection mode.

Diagram

How to use?

1. Create an Alienvault account.

Sign up an Alienvault account then go to "https://otx.alienvault.com/api" and get api key. (Alienvault OTX: https://www.alienvault.com/open-threat-exchange)

2. Setup slack webhook(Optional, if you want to use "DETECTION" mode)

Follow 'https://api.slack.com/incoming-webhooks' to the 'Getting started with Incoming Webhooks' section's step 3. Let your channel and webhook URL ready.

3. Create IAM role and Lambda

Creat an IAM role for lambda use and the IAM policy are shown as below. IAM policy:

• Lambda basic execution permission
• s3:getObject
• s3:putObject

Create Lambda function then setting the enviroment variables. Lambda's enviroment variables:

• ALIEN_API_KEY: value is your Alienvault api key.
• ALIEN_URL: 'https://otx.alienvault.com/api/v1/indicators/file/'
• ACTION: 'DETECTION' or 'PREVENTION'
• CONFIDENCE: Recommended value is '0', means any source detect this file is malware the lambda do the action(notify or remove).
• HOOK_URL: your slack webhook URL(Necessary when ACTION is DETECTION)
• SLACK_CHANNEL: your slack channel(Necessary when ACTION is DETECTION)
• LOG_LEVEL: lambda log level(Recommended value is 'info')
• TAG: Recommended value is 'TRUE'(Necessary when ACTION is DETECTION)

4. Setup S3 event trigger

Follow 'https://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html' and trigger the lambda function we create.

Quick start using cloudformation.

• Note: You can easily change region by change the URL's region(such as ap-northeast-1 -> us-east-1).
• Setup S3 event trigger is not inclue so setup the S3 event manually is necessary.

Quick start using SAM(severless application model).

Use the sam folder to deploy.

• Setup S3 event trigger is not inclue so setup the S3 event manually is necessary.

License

MIT License Details are in the LICENSE file.

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Please feel free to contact me if you have any questions. :) mailto: anderson.lin0803@gmail.com/ anderson.lin@senao.com.tw