{
  "family": "remexi",
  "sample_count": 1,
  "category": "trojan",
  "description": "<h3>Executive Summary</h3>\nRemexi is a sophisticated Backdoor Trojan historically attributed to the Iranian-linked Advanced Persistent Threat (APT) group known as Chafer (APT39). This group primarily targets telecommunications, travel, and IT sectors in the Middle East, with a strong focus on tracking individuals and stealing massive volumes of personal data (PII) for state-sponsored espionage.\n\n<h3>Infection Vector and Technical Capabilities</h3>\nThe Chafer group typically gains initial access via SQL injection attacks on vulnerable public-facing web servers or through highly targeted spear-phishing campaigns. Once inside the perimeter, they deploy Remexi to establish a covert, persistent foothold.\n\nRemexi is designed for long-term espionage and data theft:\n<ul>\n<li><strong>Covert C2 Communication:</strong> Remexi often utilizes legitimate, compromised web servers as proxies for its Command and Control communications. It may also encode its traffic within HTTP POST requests to evade network intrusion detection systems (NIDS).</li>\n<li><strong>Credential Theft and Lateral Movement:</strong> The backdoor is used to deploy secondary tools like Mimikatz or customized keyloggers to harvest credentials from the compromised host, enabling lateral movement deeper into the network.</li>\n<li><strong>Data Exfiltration:</strong> Remexi provides the attacker with a full remote shell, allowing them to quietly stage, compress, and exfiltrate large databases or archives of sensitive documents back to the attacker-controlled infrastructure.</li>\n</ul>\n\n<h3>Threat Assessment</h3>\nThe detection of Remexi is a critical, \"break-glass\" security incident indicating a successful breach by a highly motivated, state-sponsored adversary. The primary risk is the silent, ongoing theft of highly sensitive corporate databases, customer PII, or intellectual property.\n\n<h3>Incident Response and Remediation</h3>\n<ul>\n<li><strong>Forensic Triage and Containment:</strong> Do not immediately wipe the machine. Isolate the endpoint and any compromised web servers. Incident Response teams must capture volatile memory (RAM) and review IIS/Apache access logs to trace the attacker's lateral movement and identify the exfiltrated data.</li>\n<li><strong>Enterprise-Wide Threat Hunt:</strong> The presence of Remexi guarantees the attacker has obtained legitimate administrative credentials. A comprehensive enterprise-wide threat hunt must be initiated to identify all compromised service accounts and secondary backdoors (such as deployed web shells).</li>\n<li><strong>Complete Architecture Review:</strong> Remediation requires a full rebuild of the compromised endpoints, a complete reset of the Active Directory environment, and the implementation of strict network segmentation and Web Application Firewalls (WAF) to prevent the initial SQL injection vectors.</li>\n</ul>",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [
    "Backdoor.Remexi",
    "Trojan.Remexi",
    "APT.Chafer",
    "APT39"
  ],
  "enrichment_level": "insufficient_information",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1059.003",
    "T1071.001",
    "T1003.001",
    "T1105"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-07-02T06:59:32Z",
  "type": "APT / Backdoor",
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}