“`html
A notable finding in threat intelligence indicates that APT-C-35, often referred to as DoNot, continues to sustain an active infrastructure presence throughout the internet.
Security analysts have discovered new infrastructure clusters associated with this India-based threat organization, which has been long recognized as a state-sponsored entity with espionage skills targeting vital areas in South Asia.
APT-C-35 poses a continuous cybersecurity menace to entities across government, defense, and diplomatic domains.
The group’s activities have remained stable, with analysts documenting infrastructure operations that illustrate how attackers sustain command-and-control channels while bypassing conventional detection techniques.
Recent discoveries demonstrate that the group’s web servers exhibit unique traits that can be tracked and monitored by security personnel.
At-Bay analyst and researcher Idan Tarab recognized particular technical markers that differentiate APT-C-35 infrastructure from authentic web servers.
These indicators laid the groundwork for following the group’s recent endeavors and comprehending their operational techniques across various network segments.
Infrastructure Hunting and Detection Approaches
The inquiry adopted a systematic method to identify APT-C-35 assets by analyzing Apache HTTP response features in conjunction with Autonomous System Number (ASN) 399629 evaluation.
Security experts discovered that the targeted infrastructure displayed consistent patterns in HTTP responses, including certain header configurations that acted as reliable detection signatures.
The hunting queries revealed that servers linked with APT-C-35 generated specific Apache HTTP headers, comprising standardized expiration dates and content-length values.
A notable indicator identified HTTP responses with “Expires: Thu, 19 Nov 1981 08:52:00 GMT” alongside “HTTP/1.1 200 OK” status codes within ASN 399629, which significantly refined the search parameters.
Analysis uncovered roughly 73 results representing 36 distinctive IP addresses within the infrastructure cluster.
The main identified server, gilbertfix.info hosted on IP 149.248.76.43 in Wyoming, exhibited typical cache control headers such as “Cache-Control: no-store, no-cache, must-revalidate” configurations.
These defensive strategies imply that the infrastructure was constructed to deter caching and safeguard sensitive communications.
This discovery empowers security teams to implement proactive threat detection by observing these specific HTTP response patterns.
Organizations can now correlate network indicators of compromise with known APT-C-35 infrastructure, expediting incident response times and enhancing the accuracy of threat characterization.
This research underscores the significance of ongoing infrastructure hunting in sustaining operational awareness against state-sponsored threat actors.
“`