0xtf
/ tcprewrite-cheat-sheet
Last active
June 6, 2019 00:29
tcpreplay, tcprewrite and tcpdump cheat sheet
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| Visualization (tcpdump, tshark) | |
| tcpdump -qns 0 -X -r file.pcap | |
| tcpdump -qns 0 -A -r file.pcap | |
| tcpdump -X -r file.pcap | |
| tshark -r file.pcap -V | |
| Packet manipulation (tcprewrite) | |
| Port: tcprewrite --portmap=OLDPORT:NEWPORT -i in.pcap -o out.pcap |
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| TLP:RED #FF2B2B | |
| TLP:AMBER #ffc000 | |
| TLP:GREEN #33ff00 | |
| TLP:WHITE #ffffff |
0xtf
/ myip-SG-update-based-on-description
Last active
June 23, 2019 15:34
Update entries inside a AWS Security Group based on their description
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| #!/bin/bash | |
| # This is based on the work done at https://gist.github.com/isalgueiro/212a612fc232f1437ce88876937691d3/revisions#diff-c6d6f47361666bfba5538e6e0101bafd | |
| #################### | |
| # Define variables # | |
| #################### | |
| # Expected for securityGroupIds is sg-... | |
| securityGroupIds="Insert_Your_SGID" | |
| # Expected for ruleDescription is something like Home, or OfficeNY |
0xtf
/ S3 + Cloudfront CICD Policy
Created
November 11, 2019 19:41
A minimal IAM policy for usage in CICD giving access to a single bucket and allowing for CloudFront invalidations
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| { | |
| "Version": "2012-10-17", | |
| "Statement": [ | |
| { | |
| "Effect": "Allow", | |
| "Action": "s3:*", | |
| "Resource": [ | |
| "arn:aws:s3:::your_website.com", | |
| "arn:aws:s3:::your_website.com/*" | |
| ] |
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| #!/bin/bash | |
| tmux new-session -d -s d4 | |
| tmux send-keys -t d4 'tmux new-window -n d4-auth ' ENTER | |
| tmux send-keys -t d4 'tmux new-window -n d4-eve ' ENTER | |
| tmux send-keys -t d4 'tmux new-window -n suricata ' ENTER | |
| # D4 - auth.log | |
| tmux send-keys -t d4 'tmux send-keys -t d4-auth "tail -F /var/log/auth.log | grep --line-buffered sshd | egrep --line-buffered '"'Invalid user'"' | /home/user/d4-goclient/d4-goclient_linux_amd64 -c /home/administrator/d4-goclient/confs/ssh/" ENTER' ENTER |
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| literals: | |
| - ((aws.cloudtrail.error_message.keyword:* OR aws.cloudtrail.error_code.keyword:*) OR (event.action:"ConsoleLogin" AND aws.cloudtrail.response_elements.keyword:*Failure*)) | |
| - ((aws.cloudtrail.error_code.keyword:* OR aws.cloudtrail.error_message.keyword:*) OR (event.action:"ConsoleLogin" AND aws.cloudtrail.response_elements.keyword:*Failure*)) | |
| - ((aws.cloudtrail.error_message.keyword:* OR aws.cloudtrail.error_code.keyword:*) OR (aws.cloudtrail.response_elements.keyword:*Failure* AND event.action:"ConsoleLogin")) | |
| - ((aws.cloudtrail.error_code.keyword:* OR aws.cloudtrail.error_message.keyword:*) OR (aws.cloudtrail.response_elements.keyword:*Failure* AND event.action:"ConsoleLogin")) | |
| - ((event.action:"ConsoleLogin" AND aws.cloudtrail.response_elements.keyword:*Failure*) OR (aws.cloudtrail.error_message.keyword:* OR aws.cloudtrail.error_code.keyword:*)) | |
| - ((event.action:"ConsoleLogin" AND aws.cloudtrail.response_elements.keyword:*Failure*) OR (aws.cloudtrail.error_code.keyword:* OR aws.clo |
0xtf
/ sigma-overrides-regexes.yaml
Created
May 1, 2020 19:24
example of regex definition for sigma overrides
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| regexes: | |
| - (\(\(aws.cloudtrail.error_message.keyword:.* event.action:\"ConsoleLogin\"\)\)) | |
| - (\(\(aws.cloudtrail.error_code.keyword:.* event.action:\"ConsoleLogin\"\)\)) | |
| - (\(\(aws.cloudtrail.error_message.keyword:.* aws.cloudtrail.response_elements.keyword:\*Failure\*\)\)) | |
| - (\(\(aws.cloudtrail.error_code.keyword:.* aws.cloudtrail.response_elements.keyword:\*Failure\*\)\)) | |
| - (\(\(event.action:\"ConsoleLogin\".* aws.cloudtrail.error_message.keyword:\*\)\)) | |
| - (\(\(event.action:\"ConsoleLogin\".* aws.cloudtrail.error_code.keyword:\*\)\)) | |
| - (\(\(aws.cloudtrail.response_elements.keyword:\*Failure\*.* aws.cloudtrail.error_message.keyword:\*\)\)) | |
| - (\(\(aws.cloudtrail.response_elements.keyword:\*Failure\*.* aws.cloudtrail.error_code.keyword:\*\)\)) |
0xtf
/ sigma-overrides-config.yaml
Created
May 1, 2020 22:19
example of full overrides configuration using literals and regex
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| overrides: | |
| - field: event.outcome | |
| value: failure | |
| regexes: | |
| - (\(\(aws.cloudtrail.error_message.keyword:.* event.action:\"ConsoleLogin\"\)\)) | |
| - (\(\(aws.cloudtrail.error_code.keyword:.* event.action:\"ConsoleLogin\"\)\)) | |
| - (\(\(aws.cloudtrail.error_message.keyword:.* aws.cloudtrail.response_elements.keyword:\*Failure\*\)\)) | |
| - (\(\(aws.cloudtrail.error_code.keyword:.* aws.cloudtrail.response_elements.keyword:\*Failure\*\)\)) | |
| - (\(\(event.action:\"ConsoleLogin\".* aws.cloudtrail.error_message.keyword:\*\)\)) | |
| - (\(\(event.action:\"ConsoleLogin\".* aws.cloudtrail.error_code.keyword:\*\)\)) |
0xtf
/ sigma-with-failure-logic.yaml
Created
May 1, 2020 23:15
example sigma rule for cloudtrail with success/failure logic
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| title: AWS EC2 VM Export failure | |
| id: 54b9a76a-3c71-4673-b4b3-2edb4566ea7b | |
| status: experimental | |
| description: An attempt to export an AWS EC2 instance has been detected. A VM Export might indicate an attempt to extract information from an instance. | |
| references: | |
| - https://docs.aws.amazon.com/vm-import/latest/userguide/vmexport.html#export-instance | |
| author: Diogo Braz | |
| date: 2020/04/16 | |
| tags: | |
| - attack.collection |
0xtf
/ ecs-cloudtrail-mapping
Created
May 1, 2020 23:20
example output of rule with overrides and cloudtrail mapping
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| python3 sigmac -c config/ecs-cloudtrail.yml -t es-qs ../rules/cloud/aws_ec2_vm_export_failure.yml | |
| ((event.action:"CreateInstanceExportTask" AND event.provider:"ec2.amazonaws.com") AND event.outcome:failure) |
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