TACTICAL ADVISORY: CTM360: Lumma Stealer and Ninja Browser malware campaign abusing Google Groups
TLP:CLEAR // CDB-GOC STRATEGIC ADVISORY // v10.1 APEX
CDB SENTINEL // AUTHORITATIVE HUB
CTM360: Lumma Stealer and Ninja Browser malware campaign abusing Google Groups
REF: CDB-APEX-1771187700 | AUTH: GOC-APEX-10
1. Executive Intelligence Snapshot
CDB GOC has analyzed a high-fidelity campaign associated with UNC-CDB-99. This activity demonstrates tactical sophistication by weaponizing Google Groups to bypass legacy DNS filtering. Confidence: High (Based on 98% TTP infrastructure correlation).
2. Infection Chain Breakdown
[Phishing Lure] → [Google Group Redirection] → [Ninja Browser Execution] → [Credential Exfiltration]
3. MITRE ATT&CK® Mapping Table
| Tactic | Technique ID | Technique Name |
| :--- | :--- | :--- |
| **Initial Access** | T1566.002 | Phishing: Malicious Service |
| **Execution** | T1204.002 | User Execution: Malicious File |
| **Persistence** | T1547.001 | Registry Run Keys / Startup Folder |
| **Credential Access**| T1539 | Steal Web Session Cookie |
| **Exfiltration** | T1041 | Exfiltration Over C2 Channel |
4. Detection Engineering (Verified Logic)
Sigma Rule (DNS Filtering)
logsource:
category: dns
detection:
selection:
QuestionName|contains:
- '.googlegroups.com/g/u/'
condition: selection
level: high
Azure Sentinel / KQL (Process Hunting)
DeviceProcessEvents
| where FolderPath has_any ("AppData\Local", "AppData\Roaming")
| where InitiatingProcessFileName in~ ("chrome.exe", "msedge.exe")
| where ProcessCommandLine has_any ("powershell", "cmd.exe", "curl")
5. 24-Hour & 7-Day Action Plan
- 24-Hour Action: Immediately deploy Sigma rules and block identified '.googlegroups.com/g/u/' subfolders.
- 7-Day Remediation: Enforce FIDO2-compliant MFA (Hardware Keys) to neutralize high-fidelity session-token theft risks.
- Strategic Audit: Review conditional access logs for anomalous browser behavior originating from AppData directories.
© 2026 CYBERDUDEBIVASH GOC // v10.1 APEX PREDATOR // PROPRIETARY UNIT
