Suspicious Loopback Proxy Server Configured via Registry (via registry_set)

ATT&CK techniques

Persistence → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1112Modify Registry
Priv Esc
Defense Evasion
- T1112Modify Registry
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects modification of the Internet Settings ProxyServer value to a loopback address with proxy enable turned on which the CoralRaider malware uses to route victim browser traffic through a local interception proxy. Redirecting traffic to 127.0.0.1 enables credential and session theft and man-in-the-middle inspection of victim web activity.

Reporting behind it

Related detections9 linkedT1112 — drag to rearrange

Suspicious Office VBA Object Model Access Enabled via Registry (via registry_set)

Suspicious PowerShell Payload Staging in HKCU Printers Registry Key

Suspicious Rootkit Configuration Registry Keys (via registry_set)

Suspicious Disabling of Chromium App-Bound Encryption via Policy Registry Key (via registry_set)

Windows reg.exe Registry Tampering of Internal Tool and Explorer Policy Settings (T1112)

Suspicious Disabling of Restricted Admin Mode via Registry (via registry_set)

Malicious WDigest UseLogonCredential Enabled for Cleartext Credential Theft (via registry_set)

Suspicious ClickFix RunMRU Entry Recording LOLBIN Command from Run Dialog

Suspicious Access to Chrome Encrypted Preference MAC Registry Values (via registry_set)

Suspicious Loopback Proxy Server Configured via Registry (via registry_set)

Pivot detection · T1112 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →