Spaces:
Sleeping
Sleeping
File size: 8,818 Bytes
8c25076 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 | """
MEDIUM TASK — Detect Suspicious Behaviour (Brute-Force + Geo Anomaly)
=======================================================================
Scenario:
The SOC receives 23 failed login attempts against the finance server from
3 different source IPs over 8 minutes, followed by a single success from
a new geographic location. The patterns indicate a credential-stuffing or
password-spray attack that succeeded. The agent must correlate the events
and take action to stop the intrusion.
Difficulty: MEDIUM
Max steps : 8
Deterministic seed: 123
"""
from __future__ import annotations
from datetime import datetime
from typing import List
from models import (
ActionType, Alert, EventType, SecurityEvent, SOCObservation,
SystemState, ThreatLevel,
)
# ---------------------------------------------------------------------------
# Synthetic brute-force events (deterministic)
# ---------------------------------------------------------------------------
def _make_fail_event(idx: int, ip: str, minute_offset: int, country: str) -> SecurityEvent:
return SecurityEvent(
event_id=f"EVT-BF-{idx:03d}",
timestamp=datetime(2024, 7, 22, 2, minute_offset, idx % 60),
event_type=EventType.LOGIN_FAILURE,
source_ip=ip,
dest_ip="10.10.5.20",
user_id="finance.admin",
host_id="FINANCE-SRV-01",
country=country,
details={
"auth_method": "password",
"failure_reason": "INVALID_CREDENTIALS",
"attempt_number": idx,
},
raw_log=(
f"2024-07-22T02:{minute_offset:02d}:{idx % 60:02d}Z [SSH] FAIL "
f"user=finance.admin src={ip} ({country}) target=FINANCE-SRV-01"
),
)
# 23 failed logins from 3 IPs
BRUTE_FORCE_EVENTS: List[SecurityEvent] = []
_ip_pool = [
("45.142.212.100", "CN"),
("91.108.56.22", "CN"),
("77.88.55.88", "DE"), # This one is a red herring — it's a legit scanner
]
for i in range(23):
ip, country = _ip_pool[i % 3]
BRUTE_FORCE_EVENTS.append(_make_fail_event(i + 1, ip, i // 5, country))
# Successful login after brute-force
SUCCESS_EVENT = SecurityEvent(
event_id="EVT-BF-024",
timestamp=datetime(2024, 7, 22, 2, 8, 14),
event_type=EventType.LOGIN_SUCCESS,
source_ip="45.142.212.100",
dest_ip="10.10.5.20",
user_id="finance.admin",
host_id="FINANCE-SRV-01",
country="CN",
details={
"auth_method": "password",
"usual_country": "US",
"risk_signal": "geo_anomaly + brute_force_followup",
"mfa_bypassed": False,
"session_id": "sess-ff91e4",
"commands_run": ["id", "whoami", "cat /etc/passwd"],
},
raw_log=(
"2024-07-22T02:08:14Z [SSH] SUCCESS user=finance.admin "
"src=45.142.212.100 (CN) target=FINANCE-SRV-01 cmds=[id,whoami,cat /etc/passwd]"
),
)
# Benign noise events
BENIGN_EVENTS: List[SecurityEvent] = [
SecurityEvent(
event_id="EVT-N-001",
timestamp=datetime(2024, 7, 22, 2, 1, 0),
event_type=EventType.DNS_QUERY,
source_ip="10.0.0.50",
user_id=None,
host_id="DEV-LAPTOP-12",
country="US",
details={"domain": "update.microsoft.com", "record_type": "A"},
raw_log="2024-07-22T02:01:00Z [DNS] QUERY host=DEV-LAPTOP-12 domain=update.microsoft.com",
),
SecurityEvent(
event_id="EVT-N-002",
timestamp=datetime(2024, 7, 22, 2, 3, 30),
event_type=EventType.FILE_ACCESS,
source_ip="10.10.2.11",
user_id="jane.doe",
host_id="WORKSTATION-03",
country="US",
details={"file": "/reports/q2_budget.xlsx", "action": "read"},
raw_log="2024-07-22T02:03:30Z [FILE-AUDIT] READ user=jane.doe file=/reports/q2_budget.xlsx",
),
]
# ---------------------------------------------------------------------------
# Alerts
# ---------------------------------------------------------------------------
BRUTE_FORCE_ALERT = Alert(
alert_id="ALT-101",
title="Brute-Force Attack on FINANCE-SRV-01 (finance.admin)",
description=(
"23 failed SSH login attempts against finance.admin on FINANCE-SRV-01 "
"from 2 Chinese IPs over 8 minutes. Consistent with password-spray or "
"credential-stuffing attack using a leaked credentials list."
),
threat_level=ThreatLevel.HIGH,
related_events=[e.event_id for e in BRUTE_FORCE_EVENTS],
anomaly_score=0.88,
triggered_at=datetime(2024, 7, 22, 2, 6, 0),
mitre_tactic="Credential Access",
mitre_technique="T1110.003", # Password Spraying
)
GEO_ANOMALY_ALERT = Alert(
alert_id="ALT-102",
title="Geo-Anomaly: finance.admin authenticated from China",
description=(
"finance.admin successfully authenticated via SSH from China "
"(45.142.212.100) immediately following 23 failed attempts. "
"Account usually accessed from the US. Post-auth recon commands "
"detected: id, whoami, /etc/passwd access."
),
threat_level=ThreatLevel.CRITICAL,
related_events=["EVT-BF-024"] + [e.event_id for e in BRUTE_FORCE_EVENTS],
anomaly_score=0.95,
triggered_at=datetime(2024, 7, 22, 2, 8, 30),
mitre_tactic="Initial Access",
mitre_technique="T1078.001", # Default Accounts
)
# Ground truth
THREAT_IPS = {"45.142.212.100", "91.108.56.22"}
THREAT_USER = "finance.admin"
THREAT_HOST = "FINANCE-SRV-01"
ALL_EVENTS = BENIGN_EVENTS + BRUTE_FORCE_EVENTS + [SUCCESS_EVENT]
class MediumTask:
"""
Task definition for the MEDIUM scenario.
The agent must correlate brute-force failures with a geo-anomaly success.
Correct response: block primary attacker IPs and flag compromised user.
"""
TASK_ID = "medium_brute_force_geo"
MAX_STEPS = 8
def __init__(self, **kwargs):
self.primary_ip = kwargs.get("attacker_ip") or "45.142.212.100"
rotated_ips = kwargs.get("attacker_ips") or []
if rotated_ips:
self.secondary_ip = rotated_ips[0]
else:
self.secondary_ip = "91.108.56.22"
self.target_user = kwargs.get("target_user") or THREAT_USER
self.target_host = THREAT_HOST
DESCRIPTION = (
"23 failed SSH logins against the finance server from Chinese IPs, "
"followed by a successful login with post-auth recon commands. "
"Identify the attacker IPs, compromised user, and affected host."
)
def get_initial_observation(self, episode_id: str) -> SOCObservation:
events = [e.model_copy(deep=True) for e in ALL_EVENTS]
alerts = [BRUTE_FORCE_ALERT.model_copy(deep=True), GEO_ANOMALY_ALERT.model_copy(deep=True)]
for ev in events:
if ev.source_ip == "45.142.212.100":
ev.source_ip = self.primary_ip
elif ev.source_ip == "91.108.56.22":
ev.source_ip = self.secondary_ip
if ev.user_id == THREAT_USER:
ev.user_id = self.target_user
if ev.raw_log:
ev.raw_log = (
ev.raw_log
.replace("45.142.212.100", self.primary_ip)
.replace("91.108.56.22", self.secondary_ip)
.replace(THREAT_USER, self.target_user)
)
for alert in alerts:
alert.title = (
alert.title
.replace("45.142.212.100", self.primary_ip)
.replace("91.108.56.22", self.secondary_ip)
.replace(THREAT_USER, self.target_user)
)
alert.description = (
alert.description
.replace("45.142.212.100", self.primary_ip)
.replace("91.108.56.22", self.secondary_ip)
.replace(THREAT_USER, self.target_user)
)
return SOCObservation(
done=False,
reward=0.0,
metadata={"episode_id": episode_id},
task_id=self.TASK_ID,
step_number=0,
timestamp=datetime(2024, 7, 22, 2, 9, 0),
recent_events=events[-15:], # Show last 15 events (realistic SIEM window)
active_alerts=alerts,
system_state=SystemState(
active_connections=312,
blocked_ips=[],
flagged_users=[],
isolated_hosts=[],
open_incidents=1,
risk_score=0.74,
),
network_anomaly_score=0.79,
)
def get_all_events(self) -> List[SecurityEvent]:
return ALL_EVENTS
def get_threat_targets(self) -> dict:
return {
"ips": {self.primary_ip, self.secondary_ip},
"user": self.target_user,
"host": self.target_host,
"alert_ids": {"ALT-101", "ALT-102"},
}
|