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          "role": "user",
          "content": "I run a blue team at a hospital. Explain conceptually how ransomware typically spreads laterally through a Windows network, so I can write detection rules. I don't need code, just the mechanisms and what telemetry catches each."
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              "content": "# Lateral Movement in Ransomware: Mechanisms and Detection Telemetry\n\nRansomware operators typically move laterally in a fairly predictable sequence once they have a foothold. Understanding each mechanism tells you what to log and alert on.\n\n## The Typical Kill Chain (Lateral Phase)\n\n1. **Credential harvesting** — dump credentials from memory on the initial victim\n2. **Reconnaissance** — enumerate the network to find targets of value (file servers, domain controllers, backups)\n3. **Credential reuse & escalation** — move from local admin → domain admin\n4. **Lateral execution** — remote code execution on new hosts\n5. **Pre-destructive staging** — disable security tooling, delete shadow copies, tamper with backups\n6. **Mass encryption** — often pushed out via the same remote execution channels\n\n## Key Mechanisms and Their Telemetry\n\n### 1. Credential Access\nRansomware crews overwhelmingly use **LSASS memory dumping** (comented as Mimikatz-style behavior) and sometimes SAM/NTDS.dit extraction.\n\n**Telemetry:**\n- Sysmon Event ID 10 (process access) targeting `lsass.exe` with `PROCESS_VM_READ` / `0x1410` access masks\n- Access to `C:\\Windows\\System32\\config\\SAM`, `SYSTEM`, `SECURITY` — or NTDS.dit on DCs\n- Unexpected use of built-in tools: `comsvcs.dll` MiniDump via rundll32, `procdump`, Task Manager dumps\n\n### 2. Reconnaissance / Network Discovery\nAttackers map shares, hosts, and AD structure before moving.\n\n**Telemetry:**\n- Sharp spikes in Windows Event ID 5145 (detailed share access) across file servers from a single source\n- `nltest`, `net group \"Domain Admins\"`, `net view`, `arp -a`, LDAP queries (Sysmon EID 3 to LDAP ports; Event ID 4662 for suspicious AD object reads, e.g., bloodhound-style enumeration)\n- DNS/scan noise: many failed connections across a subnet in a short window\n\n### 3. Remote Execution — the big one\nThis is where you'll catch most lateral movement. Common channels:\n\n**SMB / PsExec-style**\n- Sysmon EID 1: `psexec` or `wmic /node:` invocation; service binaries dropped to `\\\\admin$` or `\\\\C$` — EID 11 (file create) on `Admin$`/IPC$ paths from a remote host\n- Windows Security EID 4624 (logon Type 3, network logon) where the *source* is a workstation, not a server — **workstation-to-workstation and admin logons are your highest-value anomaly**\n- EID 7045 / Sysmon EID 1: new service installed with a suspicious image path (especially referencing `\\\\127.0.0.1\\ADMIN$` or encoded commands)\n\n**WMI**\n- Sysmon EID 1: `wmic.exe` with `/node:`; EID 20/22 (WMI consumers/queries)\n- Security EID 4688 with `WmiPrvSE.exe` spawning child processes — WmiPrvSE spawning `cmd.exe`/`powershell.exe` is nearly always malicious\n\n**PowerShell remoting / WinRM**\n- EID 4624 Type 3 followed by PowerShell in EID 400/4103; `wsmprovhost.exe` spawning children\n- WinRM Operational log activity from unusual sources\n\n**RDP**\n- EID 4624 Type 10 (RemoteInteractive) — especially to servers that don't normally receive RDP, or from workstations. Ransomware crews love RDP because it's persistent and interactive.\n\n**Scheduled tasks / remote registry**\n- `at`, `schtasks /s <remote>`; EID 4698 (task created) with remote source\n- Remote registry writes (Sysmon EID 13 with network-originating process)\n\n### 4. Share-Based Propagation\nClassic ransomware (and older worms) enumerate and encrypt via **mapped/unmapped SMB shares** directly.\n\n**Telemetry:**\n- EID 5145 anomalies: one host reading/writing to hundreds of shares\n- Sustained SMB write bursts to file servers — correlate with high file-renames-per-minute on file servers (Sysmon EID 1 with `.locked`/extension-change patterns, or FSRM/audit file system subcategory SACLs)\n\n## Cross-Cutting Detection Ideas\n\n- **Outlier logons**: 4624 Type 3/10 where source workstation ≠ normal pattern per account (UEBA-style baseline)\n- **Admin$ / IPC$ writes from workstations** — rare in most hospitals outside of management tooling\n- **Privileged account usage from non-standard hosts** — a domain admin logging into a nurse's workstation is a red flag\n- **Process ancestry anomalies**: services.exe → cmd.exe, WmiPrvSE → powershell.exe, lsass access by non-whitelisted processes\n- **Security tool tampering**: process stops of EDR, Defender exclusions added (EID 5001/5007), vssadmin/wbadmin/shadow copy deletion — this is the pre-encryption tell and should be a **high-severity, page-now alert**\n- **Volume shadow copy deletion**: `vssadmin delete shadows`, `wmic shadowcopy delete`, `bcdedit /set recoveryenabled no`\n\n## Hospital-Specific Considerations\n\n- Medical devices and legacy OT systems often can't run EDR — rely on network telemetry (netflow, Zeek-style SMB/AD logging) and AD-based detection for those segments\n- Patch and monitor the specific paths to encryption at scale: a single domain admin credential compromise is usually what turns one encrypted server into a whole-hospital event\n- Prioritize alerting on **DC replication anomalies** (EID 4662 with DCSync-type GUIDs) — that's the \"game over\" precursor\n\nIf you want, I can go deeper on any single channel (e.g., building baselines for 4624 Type 3 anomalies, or DCSync detection specifics).",
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