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New attack technique: Usage of ec2instanceconnect:SendSSHPublicKey on…
… multiple instances (#467) * add aws send-ssh-public-key attack technique * delete replace * terraform fmt * Formatting and small code enhancements --------- Co-authored-by: Christophe Tafani-Dereeper <[email protected]>
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docs/attack-techniques/AWS/aws.lateral-movement.ec2-instance-connect.md
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| --- | ||
| title: Usage of EC2 Instance Connect on multiple instances | ||
| --- | ||
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| # Usage of EC2 Instance Connect on multiple instances | ||
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| <span class="smallcaps w3-badge w3-orange w3-round w3-text-sand" title="This attack technique might be slow to warm up or detonate">slow</span> | ||
| <span class="smallcaps w3-badge w3-blue w3-round w3-text-white" title="This attack technique can be detonated multiple times">idempotent</span> | ||
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| Platform: AWS | ||
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| ## MITRE ATT&CK Tactics | ||
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| - Lateral Movement | ||
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| ## Description | ||
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| Simulates an attacker pushing an SSH public key to multiple EC2 instances, which then will allow anyone with the corresponding private key to | ||
| connect directly to the systems via SSH. | ||
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| <span style="font-variant: small-caps;">Warm-up</span>: | ||
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| - Create multiple EC2 instances and a VPC (takes a few minutes). | ||
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| <span style="font-variant: small-caps;">Detonation</span>: | ||
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| - Adds a public SSH key to the EC2 for 60 seconds. | ||
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| References: | ||
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| - https://securitylabs.datadoghq.com/articles/tales-from-the-cloud-trenches-ecs-crypto-mining/#hands-on-keyboard-activity-begins | ||
| - https://sysdig.com/blog/2023-global-cloud-threat-report/ | ||
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| ## Instructions | ||
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| ```bash title="Detonate with Stratus Red Team" | ||
| stratus detonate aws.lateral-movement.ec2-instance-connect | ||
| ``` | ||
| ## Detection | ||
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| Identify, through CloudTrail's <code>SendSSHPublicKey</code> event, when a user is adding an SSH key to multiple EC2 instances. Sample event: | ||
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| ``` | ||
| { | ||
| "eventSource": "ec2-instance-connect.amazonaws.com", | ||
| "eventName": "SendSSHPublicKey", | ||
| "requestParameters": { | ||
| "instanceId": "i-123456", | ||
| "instanceOSUser": "ec2-user", | ||
| "sSHPublicKey": "ssh-ed25519 ..." | ||
| } | ||
| } | ||
| ``` | ||
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docs/attack-techniques/AWS/aws.lateral-movement.ec2-send-ssh-public-key.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| --- | ||
| title: Usage of ec2instanceconnect:SendSSHPublicKey on multiple instances | ||
| --- | ||
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| # Usage of ec2instanceconnect:SendSSHPublicKey on multiple instances | ||
|
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||
| <span class="smallcaps w3-badge w3-orange w3-round w3-text-sand" title="This attack technique might be slow to warm up or detonate">slow</span> | ||
| <span class="smallcaps w3-badge w3-blue w3-round w3-text-white" title="This attack technique can be detonated multiple times">idempotent</span> | ||
|
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| Platform: AWS | ||
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| ## MITRE ATT&CK Tactics | ||
|
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||
|
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| - Lateral Movement | ||
|
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||
| ## Description | ||
|
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||
|
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| Simulates an attacker pushing a Secure Shell (SSH) public key to multiple EC2 instances, which then will allow anyone with the corresponding private key to | ||
| connect directly to the systems via SSH. | ||
|
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| <span style="font-variant: small-caps;">Warm-up</span>: | ||
|
|
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| - Create multiple EC2s instances and VPC (takes a few minutes). | ||
|
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| <span style="font-variant: small-caps;">Detonation</span>: | ||
|
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| - Adds a public SSH key to the EC2 for 60 seconds. | ||
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| References: | ||
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| - https://sysdig.com/blog/2023-global-cloud-threat-report/ | ||
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| ## Instructions | ||
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| ```bash title="Detonate with Stratus Red Team" | ||
| stratus detonate aws.lateral-movement.ec2-send-ssh-public-key | ||
| ``` | ||
| ## Detection | ||
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| Identify, through CloudTrail's <code>SendSSHPublicKey</code> event, when a user is adding an SSH key to multiple EC2s. | ||
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91 changes: 91 additions & 0 deletions
91
v2/internal/attacktechniques/aws/lateral-movement/ec2-send-ssh-public-key/main.go
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| package aws | ||
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| import ( | ||
| "context" | ||
| _ "embed" | ||
| "fmt" | ||
| "github.com/aws/aws-sdk-go-v2/service/ec2instanceconnect" | ||
| "github.com/datadog/stratus-red-team/v2/pkg/stratus" | ||
| "github.com/datadog/stratus-red-team/v2/pkg/stratus/mitreattack" | ||
| "log" | ||
| "strings" | ||
| ) | ||
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| //go:embed my_key.pub | ||
| var publicSSHKey string | ||
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| //go:embed main.tf | ||
| var tf []byte | ||
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| func init() { | ||
| const codeBlock = "```" | ||
| stratus.GetRegistry().RegisterAttackTechnique(&stratus.AttackTechnique{ | ||
| ID: "aws.lateral-movement.ec2-instance-connect", | ||
| FriendlyName: "Usage of EC2 Instance Connect on multiple instances", | ||
| IsSlow: true, | ||
| Description: ` | ||
| Simulates an attacker pushing an SSH public key to multiple EC2 instances, which then will allow anyone with the corresponding private key to | ||
| connect directly to the systems via SSH. | ||
| Warm-up: | ||
| - Create multiple EC2 instances and a VPC (takes a few minutes). | ||
| Detonation: | ||
| - Adds a public SSH key to the EC2 for 60 seconds. | ||
| References: | ||
| - https://securitylabs.datadoghq.com/articles/tales-from-the-cloud-trenches-ecs-crypto-mining/#hands-on-keyboard-activity-begins | ||
| - https://sysdig.com/blog/2023-global-cloud-threat-report/ | ||
| `, | ||
| Detection: ` | ||
| Identify, through CloudTrail's <code>SendSSHPublicKey</code> event, when a user is adding an SSH key to multiple EC2 instances. Sample event: | ||
| ` + codeBlock + ` | ||
| { | ||
| "eventSource": "ec2-instance-connect.amazonaws.com", | ||
| "eventName": "SendSSHPublicKey", | ||
| "requestParameters": { | ||
| "instanceId": "i-123456", | ||
| "instanceOSUser": "ec2-user", | ||
| "sSHPublicKey": "ssh-ed25519 ..." | ||
| } | ||
| } | ||
| ` + codeBlock + ` | ||
| `, | ||
| Platform: stratus.AWS, | ||
| PrerequisitesTerraformCode: tf, | ||
| IsIdempotent: true, | ||
| MitreAttackTactics: []mitreattack.Tactic{mitreattack.LateralMovement}, | ||
| Detonate: detonate, | ||
| }) | ||
| } | ||
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| func detonate(params map[string]string, providers stratus.CloudProviders) error { | ||
| ec2instanceconnectClient := ec2instanceconnect.NewFromConfig(providers.AWS().GetConnection()) | ||
| instanceIDs := strings.Split(params["instance_ids"], ",") | ||
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| for _, instanceID := range instanceIDs { | ||
| cleanInstanceID := strings.Trim(instanceID, " \"\n\r") | ||
| err := sendSSHPublicKey(ec2instanceconnectClient, cleanInstanceID, "ec2-user", publicSSHKey) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to send SSH public key to instance %s: %v", cleanInstanceID, err) | ||
| } | ||
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| log.Printf("SSH public key successfully added to instance %s", cleanInstanceID) | ||
| } | ||
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| return nil | ||
| } | ||
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| func sendSSHPublicKey(ec2instanceconnectClient *ec2instanceconnect.Client, instanceId, instanceOSUser, sshPublicKey string) error { | ||
| _, err := ec2instanceconnectClient.SendSSHPublicKey(context.Background(), &ec2instanceconnect.SendSSHPublicKeyInput{ | ||
| InstanceId: &instanceId, | ||
| InstanceOSUser: &instanceOSUser, | ||
| SSHPublicKey: &sshPublicKey, | ||
| }) | ||
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| return err | ||
| } |
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