APT-C-35 Infrastructure Activity Leveraged Using Apache HTTP Response Indicators
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A significant discovery in threat intelligence reveals that APT-C-35, commonly known as DoNot, continues to maintain an active infrastructure footprint across the internet. <\/p>\n
Security researchers have identified new infrastructure clusters linked to this India-based threat group, which has long been recognized as a state-sponsored actor with espionage capabilities targeting critical regions in South Asia.<\/p>\n
APT-C-35 represents a persistent cybersecurity threat to organizations across government, defense, and diplomatic sectors. <\/p>\n
The group\u2019s operations have remained consistent, with researchers documenting infrastructure activities that show how attackers maintain command-and-control channels while evading traditional detection methods<\/a>. <\/p>\n Recent findings show that the group\u2019s web servers maintain distinct characteristics that can be traced and monitored by security teams.<\/p>\n At-Bay analyst and researcher Idan Tarab identified<\/a> specific technical markers that distinguish APT-C-35 infrastructure from legitimate web servers. <\/p>\n These indicators provided the foundation for tracking the group\u2019s recent activities and understanding their operational methods across multiple network segments.<\/p>\n The investigation employed a structured approach to identify APT-C-35 assets by examining Apache HTTP response characteristics combined with Autonomous System Number (ASN) 399629 analysis. <\/p>\n Security researchers discovered that the targeted infrastructure revealed consistent patterns in HTTP responses, including specific header configurations that served as reliable detection signatures.<\/p>\n The hunting queries revealed that servers<\/a> associated with APT-C-35 returned specific Apache HTTP headers, including standardized expiration dates and content-length values. <\/p>\n One particular indicator identified HTTP responses with \u201cExpires: Thu, 19 Nov 1981 08:52:00 GMT\u201d paired with \u201cHTTP\/1.1 200 OK\u201d status codes across ASN 399629, which significantly narrowed the search scope.<\/p>\n Analysis uncovered approximately 73 results representing 36 unique IP addresses within the infrastructure cluster. <\/p>\n The primary identified server, gilbertfix.info hosted on IP 149.248.76.43 in Wyoming, showed typical cache control headers including \u201cCache-Control: no-store, no-cache, must-revalidate\u201d configurations. <\/p>\n These defensive measures suggest the infrastructure was designed to prevent caching and secure sensitive communications.<\/p>\n The discovery enables security teams to implement proactive threat detection by monitoring<\/a> for these specific HTTP response patterns. <\/p>\n Organizations can now correlate network indicators of compromise with known APT-C-35<\/a> infrastructure, accelerating incident response times and improving threat characterization accuracy. <\/p>\n This research reinforces the importance of continuous infrastructure hunting in maintaining operational awareness against state-sponsored threat actors.<\/p>\n Follow us on\u00a0Google News<\/a>,\u00a0LinkedIn<\/a>,\u00a0and\u00a0X<\/a>\u00a0to Get More Instant Updates<\/strong>,\u00a0Set CSN as a Preferred Source in\u00a0Google<\/a>.<\/strong><\/p>\n The post APT-C-35 Infrastructure Activity Leveraged Using Apache HTTP Response Indicators<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\nInfrastructure Hunting and Detection Methods<\/strong><\/h2>\n