CampaignPublished 3 Jun 2025Updated 3 Jul 2025

Illuminating Transparent Tribe

Source AlienVault OTX General

Description

This analysis explores the infrastructure of APT36, also known as Transparent Tribe, using passive DNS and host response history. Starting with indicators from a CyberXTron report on a targeted phishing attack against Indian Government and Defense, the investigation expands through DNS history, IP pivoting, and host response analysis. Key findings include shared name server patterns, non-Cloudflare IP addresses, and connections to previously unreported domains. The research identifies potential new infrastructure using ETag pivoting, revealing domains with similar subdomain conventions to known Transparent Tribe assets. The methodology demonstrates the power of comprehensive DNS data and host response history in uncovering hidden connections and potential threat infrastructure.

Impact

For European organizations, the direct impact of this threat is currently limited given the primary targeting of Indian government and defense sectors. However, the techniques and infrastructure discovery methods used by Transparent Tribe could be adapted or expanded to target European entities, especially those involved in defense, government, or critical infrastructure sectors. The use of phishing campaigns leveraging cloud-themed domains could deceive employees into credential theft or malware deployment, potentially leading to data breaches, espionage, or disruption of operations. The presence of sophisticated infrastructure and evasion techniques such as ETag pivoting indicates a high level of operational security, making detection and mitigation more challenging. European organizations with partnerships or data exchanges with Indian entities or those operating in similar sectors should be vigilant. Additionally, the campaign's focus on infrastructure acquisition and reconnaissance suggests potential for future escalation or targeting of new regions, including Europe.

Defensive guidance

European organizations should implement targeted defenses against phishing campaigns that mimic legitimate cloud service domains. This includes deploying advanced email filtering solutions capable of detecting domain spoofing and suspicious subdomain patterns similar to those identified (e.g., mgovcloud.in.*). Network defenders should incorporate passive DNS monitoring and historical DNS analysis into their threat hunting processes to identify suspicious domain registrations and infrastructure overlaps. Utilizing HTTP header analysis, including ETag values, can help detect anomalous host responses indicative of threat actor infrastructure. Organizations should conduct regular employee training focused on recognizing sophisticated phishing attempts, especially those involving cloud service impersonation. Multi-factor authentication (MFA) must be enforced to limit the impact of credential theft. Collaboration with national cybersecurity centers to share intelligence on emerging APT infrastructure and phishing campaigns is recommended. Finally, organizations should maintain updated threat intelligence feeds that include indicators related to Transparent Tribe and similar APT groups to enable timely blocking and investigation.

Indicators of compromise

Domains 4

37-221-64-252.cprapid.com
accounts.mgovcloud.in.cloudshare.digital
accounts.mgovcloud.in.storagecloud.download
accounts.mgovcloud.in.virtualeoffice.cloud

IP addresses 1

CC=MD ASN=AS200019 alexhost srl

37.221.64.252

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Description

AI analysisMachine-generated, updated 4 Jul 2025, 16:56 UTC

MITRE ATT&CK techniques5 from threat tags

Technical details

Indicators of compromise

Domains 4

IP addresses 1

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