Forge Web Credentials T1606
Tactic: Credential Access
Adversaries may forge credential materials that can be used to gain access to web applications or Internet services. Web applications and services (hosted in cloud SaaS environments or on-premise servers) often use session cookies, tokens, or other materials to authenticate and authorize user access.
Events covered
1 catalog event is tagged with this technique by at least one rule.
| Provider | Event | Title |
|---|---|---|
| Defender-DeviceEvents | any | Defender event (any) |
Authoring guide
Patterns shared across the 16 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names 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 (47 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 (94 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. Click a value to expand the rules under this technique that use it.
Exclusions (2 distinct)
Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.
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 1 rule
Elastic 2 rules
- FortiGate FortiCloud SSO Login from Unusual Source
- M365 Identity Unusual SSO Authentication Errors for User
Kusto 13 rules
- Azure secure score PW age policy new
- BTP - Cloud Identity Service application configuration monitor
- BTP - Trust and authorization Identity Provider monitor
- Cross-Cloud Unauthorized Credential Access Detection From AWS RDS Login
- Detect device token stealing with WDAC
- Detect entra token request via specific BOF (IOC based)
- Detect Multiple Hello for Business PRT tokens being used simultaneously for one device.
- Detect suspicious foci token logins
- Detect suspicious foci token logins V2
- Detect Suspicious ncrypt.dll usage by CLI tool or unknown process
- Detect Suspicious ncrypt.dll usage by process requesting Entra ID Nonce
- Detect Suspicious ncrypt.dll usage on admin device with RDP connections to non TPM protected device
- Detect Suspicious ncrypt.dll usage with RDP connections to unmanaged or non TPM protected device