ATT&CK coverage › Technique
Exploit Public-Facing Application T1190
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network. The weakness in the system can be a software bug, a temporary glitch, or a misconfiguration.
Events covered
9 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 24 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (15 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (181 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 10 rules
- Failed Logon From Public IP
- Remote Access Tool - ScreenConnect Server Web Shell Execution
- Suspicious Child Process Of SQL Server
- Suspicious File Drop by Exchange
- Suspicious File Write to SharePoint Layouts Directory
- Suspicious File Write to Webapps Root Directory
- Suspicious MSExchangeMailboxReplication ASPX Write
- Suspicious Process By Web Server Process
- Suspicious Processes Spawned by WinRM
- Terminal Service Process Spawn
Splunk 9 rules
- ConnectWise ScreenConnect Path Traversal
- ConnectWise ScreenConnect Path Traversal Windows SACL
- Detect Exchange Web Shell
- MS Exchange Mailbox Replication service writing Active Server Pages
- Outbound Network Connection from Java Using Default Ports
- Web or Application Server Spawning a Shell
- Windows Identify PowerShell Web Access IIS Pool
- Windows MOVEit Transfer Writing ASPX
- Windows SharePoint Spinstall0 Webshell File Creation
Kusto Query Language 5 rules
- AV detections related to SpringShell Vulnerability
- Exchange OAB Virtual Directory Attribute Containing Potential Webshell
- Identify SysAid Server web shell creation
- Microsoft Defender for Endpoint (MDE) signatures for Azure Synapse pipelines and Azure Data Factory
- Silk Typhoon New UM Service Child Process