Techniques › T1133 › AN1004
AN1004 Analytic 1004
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Unusual or unauthorized external remote access attempts (e.g., RDP, VPN, Citrix) → repeated failed logins followed by a successful session from uncommon geolocations or outside business hours → subsequent internal lateral movement or data exfiltration activities.</p>
- Detects
- T1133 External Remote Services
- Part of
- DET0354 Behavior-chain detection for T1133 External Remote Services across Windows, Linux, macOS, Containers
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| WinEventLog:Security | EventCode=4776, 4625 | DC0002 User Account Authentication |
| WinEventLog:Application | VPN, Citrix, or remote access gateway logs showing external IP addresses | DC0038 Application Log Content |
| WinEventLog:Sysmon | EventCode=3, 22 | DC0082 Network Connection Creation |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
BusinessHours | Normal business hours for logon activity. |
KnownRemoteIPs | List of approved external IPs or VPN endpoints. |
FailedLogonThreshold | Number of failed logons before raising suspicion (e.g., >5). |
GeoIPWhitelist | Geographic regions allowed for remote access. |
TimeWindow | Time window to correlate failed attempts and success (e.g., 15m). |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2014-6271 | GNU Bourne-Again Shell (Bash) | Mapped |
| CVE-2014-7169 | GNU Bourne-Again Shell (Bash) | Mapped |
| CVE-2018-4939 | Adobe ColdFusion | Mapped |
| CVE-2019-0708 | Microsoft Remote Desktop Services | Mapped |
| CVE-2019-11510 | Ivanti Pulse Connect Secure | Mapped |
| CVE-2019-19781 | Citrix Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance | Mapped |
| CVE-2019-3396 | Atlassian Confluence Server and Data Server | Mapped |
| CVE-2019-5591 | Fortinet FortiOS | Mapped |
| CVE-2020-1472 | Microsoft Netlogon | Mapped |
| CVE-2020-25506 | D-Link DNS-320 Device | Mapped |
| CVE-2020-5902 | F5 BIG-IP | Stale |
| CVE-2020-8515 | DrayTek Multiple Vigor Routers | Mapped |
| CVE-2021-1497 | Cisco HyperFlex HX | Mapped |
| CVE-2021-1498 | Cisco HyperFlex HX | Mapped |
| CVE-2021-22986 | F5 BIG-IP and BIG-IQ Centralized Management | Mapped |
| CVE-2021-26855 | Microsoft Exchange Server | Mapped |
| CVE-2021-26857 | Microsoft Exchange Server | Mapped |
| CVE-2022-20699 | Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers | Mapped |
| CVE-2023-20269 | Cisco Adaptive Security Appliance and Firepower Threat Defense | Mapped |
| CVE-2023-27532 | Veeam Backup & Replication | Mapped |
| CVE-2023-39780 | ASUS RT-AX55 Routers | Mapped |
| CVE-2023-48365 | Qlik Sense | Mapped |
| CVE-2024-11120 | GeoVision Multiple Devices | Mapped |
| CVE-2024-45195 | Apache OFBiz | Mapped |
| CVE-2025-32756 | Fortinet Multiple Products | Mapped |