Grapl: A Graph Platform for Detection and Response

@insanitybit

Edge

Node

Edge

Manage from reality because that's the prepared Defenders Mindset

https://github.com/BloodHoundAD/BloodHound

[
  {
  'ppid': 100,
  'pid': 250,
  'action': 'started',
  'time': '2019-02-24 18:21:25'
  },
  {
  'ppid': 250,
  'pid': 350,
  'action': 'started',
  'time': '2019-02-24 18:22:31'
  }
]

[
  {
  'pid': 350,
  'action': 'connected_to',
  'domain': 'evil.com',
  'time': '2019-02-24 18:24:27'
  },
  {
  'pid': 350,
  'action': 'created_file',
  'path': 'downloads/evil.exe',
  'time': '2019-02-24 18:28:31'
  }
]

seen_at: '2019-02-24 18:21:25'

created_at: '2019-02-24 18:21:25'

created_at: '2019-02-24 18:22:31'

seen_at: '2019-02-24 18:24:27'

seen_at: '2019-02-24 18:28:31'

seen_at: '2019-02-24 18:22:31'

seen_at: '2019-02-24 18:24:27'

seen_at: '2019-02-24 18:28:31'

Grapl

Graph Analytics Platform

for Detection, Forensics, and Incident Response

Consumes logs
Turn logs into subgraphs
Merge subgraphs into master graph
Executes code against master graph to find scary patterns
Scopes engagements through graph expansion

{
  "host_id": "cobrien-mac",
  "parent_pid": 3,
  "pid": 4,
  "image_name": "word.exe",
  "create_time": 600,
}
{
  "host_id": "cobrien-mac",
  "parent_pid": 4,
  "pid": 5,
  "image_name": "payload.exe",
  "create_time": 650,
}

word.exe

payload.exe

ssh.exe

/secret/file

evil.com

explorer.exe

payload.exe

word.exe

Process {
  image_name: str,
  image_path: str,
  pid: int,
  create_time: int,
  terminate_time: int,
  last_seen_time: int,
  children: [Process],
  binary: File,
  created_files: [File],
  read_files: [File],
  written_files: [File],
  deleted_files: [File],
  outbound: [OutboundConnection],
  inbound: [InboundConnection]
}

File {
  path: str,
  create_time: int,
  delete_time: int,
  last_seen_time: int,  
}

OutboundConnection {
    port: int,
    created: int,
    ended: int,
    bound_connection: InboundConnection
}

InboundConnection {
    port: int,
    created: int,
    ended: int,
}

User {
    assets: [Asset],
    reports_to: User,
    created: int,
    ended: int,
}

Asset {
    processes: [Process],
}

Email {
    from: User,
    to: User,
    subject: str,
    body: str
}

ExternalIp {
    port: int,
    address: str,
}

{
  'pid': 100,
  'type': 'process_start',
  'timestamp': 1551753726,
  'image': '/usr/bin/program',
}

{
  'pid': 100,
  'type': 'file_read',
  'path': '/home/.cache/file',
  'timestamp': 1551754726
}

{
  'pid': 100,
  'type': 'process_terminate',
  'timestamp': 1551755726,
  'image': '/usr/bin/program',
}

pid: 100

created: 1551753726

terminated: 1551755726

image: '/usr/bin/program'

node_key: <uuid>

pid 250

C - Process Create Event

C - 0

0 10 20 30 40 50 60 70 80

{
  'pid': 250,
  'created_at': 30
}

C - 1

ID - 0

{
  'pid': 250,
  'created_at': 50
}

ID - 1

pid 250

C - Process Create Event

C - 0

0 10 20 30 40 50 60 70 80

{
  'pid': 250,
  'seen_at': 30
}

C - 1

ID - 0

pid 250

C - Process Create Event

0 10 20 30 40 50 60 70 80

{
  'pid': 250,
  'seen_at': 30
}

C - 1

G - Process Create Event (Guessed)

G - 0

ID - 0

pid 250

C - Process Create Event

0 10 20 30 40 50 60 70 80

{
  'pid': 250,
  'seen_at': 20
}

C - 1

G - Process Create Event (Guessed)

G - 0

ID - 0

{
  'type': 'Process Create',
  'image': 'C:\Program Files\Microsoft Office\winword.exe',
  'pid': 1200,
  'ppid': 1080
}

{
  'type': 'Process Create',
  'image': 'C:\Windows\WindowsPowershell\v1.0\powershell.exe',
  'pid': 2590,
  'ppid': 1200,
}

word.exe

powershell.exe

word.exe

payload.exe

wmiexec.exe

/secret/file

evil.com

explorer.exe

word.exe

payload.exe

word.exe

evil.com

word.exe talking to non-whitelisted domain

word.exe spawning child process

cmd.exe

payload.exe

wmiexec.exe

cmd.exe

wmiexec from non standard grandparent process


# Malware names itself 'svchost.exe' in order to look legitimate
def signature_graph(node_key) -> str:
    child = Process() \
        .with_image_name(contains="svchost.exe") \
        .with_node_key(eq=node_key)

    parent = Process() \
        .with_image_name(contains=Not("services.exe"))
    return parent.with_child(child).to_query()


def _analyzer(client: DgraphClient, graph: Subgraph, sender: Connection):
    hits = analyze_by_node_key(client, graph, signature_graph)

    for hit in hits:
        sender.send(ExecutionHit.from_parent_child(hit))

    sender.send(ExecutionComplete())

{
    'pid': 250,
    'ppid': 150,
    'created_at': 1551565127,
    'hash': 'acbd18db4cc2f85cedef654fccc4a4d8',
    'image_name': '/home/user/downloads/evil.sh'
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
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}

{
  ~~: ~~
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}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

{
  ~~: ~~
  ~~: ~~
}

Search Window

pid collision

{
  ~~: ~~
  ~~: ~~
}

Alert

cmd.exe

svchost.exe

wmiexec.exe

/secret/file

evil.com

engagement = Engagement(engagement_id)
svchost = engagement.get_by_image_name(contains="svchost.exe")
parent = svchost.get_parent()

parent.get_connections()

svchost.get_read_files()
svchost.get_children_files()

raw-logs

sysmon-log-parser

generic-log-parser

unidentified-subgraphs

node-identifier

graph-merger

raw-logs

sysmon-log-parser

generic-log-parser

custom-parser


    let parent = ProcessDescriptionBuilder::default()
        .host_id(process_start.computer)
        .state(ProcessState::Existing)
        .pid(process_start.ppid)
        .last_seen_timestamp(timestamp)
        .build()?;

    let child = ProcessDescriptionBuilder::default()
        .host_id(process_start.computer)
        .image_path(process_start.image)
        .image_name(get_image_name(&process_start.image)?)
        .state(ProcessState::Created)
        .pid(process_start.pid)
        .created_timestamp(timestamp)
        .build()?;

{
    'action': 'Process Create',
    'computer': 'winuser-laptop',
    'ppid': 100,
    'pid: 150,
    'image': 'C:\\Users\\Demo\\Downloads\\foo.exe',
    'timestamp': 1551578297
}


    let child_exe = FileDescriptionBuilder::default()
        .hostt_id(process_start.computer)
        .state(FileState::Existing)
        .last_seen_timestamp(timestamp)
        .path(process_start.image)
        .build()?;

{
    'action': 'Process Create',
    'computer': 'winuser-laptop',
    'ppid': 100,
    'pid: 150,
    'image': 'C:\\Users\\Demo\\Downloads\\foo.exe',
    'timestamp': 1551578297
}


    let mut graph = GraphDescription::new(
        timestamp
    );

    graph.add_edge("bin_file",
                   child.clone_key(),
                   child_exe.clone_key()
    );
    graph.add_node(child_exe);
    graph.add_edge("children",
                   parent.clone_key(),
                   child.clone_key());
    graph.add_node(parent);
    graph.add_node(child);

Automated scoping

https://www.princeton.edu/~pmittal/publications/priotracker-ndss18

$ git clone git@github.com:insanitybit/grapl.git
$ cd ./grapl/grapl-cdk/
$ npm install -g
$ <your editor> ./.env

HISTORY_DB_USERNAME=username
HISTORY_DB_PASSWORD=password
BUCKET_PREFIX="<unique identifier>"
GRAPH_DB_KEY_NAME=<name of SSH key, if debug mode is enabled, to SSH to graphdb>

$ ssh ubuntu@<master_graph/engagement_graph>
$ curl https://get.dgraph.io -sSf > setup.sh
$ <inspect setup.sh>
$ ./setup.sh
$ dgraph zero &
$ dgraph alpha --zero localhost:5080 &
$ dgraph-ratel &

# ./deploy_all.sh

$ cd ../grapl/
$ python ./gen-raw-logs.py <your bucket prefix>

Questions

@insanitybit

https://github.com/insanitybit/grapl

Grapl: A Graph Platform for Detection and Response

By Colin

Grapl: A Graph Platform for Detection and Response

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