{
  "id": 332529,
  "title": "Head Mare Breaches TrueConf: From SYSTEM Privileges to Trojanized Legitimate Client Updates",
  "url": "https://urgent.news/2026/08/09/head-mare-breaches-trueconf-from-system-privileges-to-trojanized",
  "topic": "culture",
  "section": "Culture",
  "published": "2026-08-09T01:52:25.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/anoymask/head-mare-breaches-trueconf-from-system-privileges-to-trojanized-legitimate-client-updates-1ke1"
  },
  "original_language": "en",
  "account": "TrueConf, a video conferencing software, was breached by hackers known as Head Mare, who exploited vulnerabilities to gain SYSTEM privileges, replace legitimate client updates with Trojanized installers, and create a web shell. The attackers used two main methods: compromising the TrueConf Server and replacing the client installer with a malicious version. The vulnerability chain was previously reported as CVE-2026-3502 / Operation True Chaos. Head Mare utilized scripts and exploits, such as KLCERT-26-057 and KLCERT-26-058, to gain access and elevate privileges. Once inside, the attackers replaced the TrueConf Server's locale.php file with a PHP web shell, allowing them to control the server and distribute the Trojanized installers. They then deployed PhantomCore, a Trojan, onto the endpoint, granting them access to the TrueConf database and enabling further malicious activities. The attackers maintained persistence through various methods, including a Windows service, a CLSID under HKCU, and a web shell. The compromise spread to clients and partners via the legitimate distribution channel, leading to credential theft, reconnaissance, and further command execution.",
  "summary": "Head Mare Breaches TrueConf: From SYSTEM Privileges to Trojanized Legitimate Client Updates 1. Basic Information Article Title : Hackers breach TrueConf to trojanize client installers with backdoors Publisher : BleepingComputer Publication Date : August 8, 2026, 10:16 (As noted in the article) Original Source : BleepingComputer Primary Source : Kaspersky Securelist Related Malware : PhantomCore,…",
  "key_points": [
    "Head Mare breached TrueConf using SYSTEM privileges",
    "Attackers replaced client updates with Trojanized installers",
    "Web shell and PhantomCore Trojan deployed for persistence"
  ],
  "editors_take": "This breach allows attackers to control the server, distribute Trojanized installers, and access the TrueConf database, indicating a significant escalation of privileges and potential for widespread damage.",
  "illustration": "https://urgent.news/ill/332529.png",
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}