UnknownPublished 27 Mar 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-03-27

Affects tlp clearSource CIRCL OSINT Feed

TLP:CLEAR, disclosure is not limited

Mentions 2 CVEs

Mentioned vulnerabilities

Description

KRVTZ-NET IDS alerts for 2026-03-27

Impact

The impact is primarily related to reconnaissance activities that may precede exploitation attempts. Successful exploitation of CVE-2023-27997 on Fortigate VPN devices could lead to unauthorized access or remote code execution, compromising network security. Exploitation of the Joomla Simple File Upload Plugin vulnerability could allow attackers to execute arbitrary code on affected web servers, potentially leading to data breaches or further malware deployment. The coinminer-related traffic indicates possible unauthorized use of system resources, which can degrade performance and increase operational costs. However, no active exploitation or ransomware campaigns are currently reported, limiting immediate impact. Organizations with exposed Fortigate VPNs or Joomla CMS instances without proper patching are at higher risk.

Defensive guidance

1) Fortigate VPN users should verify and apply all security patches addressing CVE-2023-27997 as per vendor advisories. Restrict access to VPN management interfaces using IP whitelisting and multi-factor authentication. 2) Joomla CMS administrators must update the Simple File Upload Plugin to the latest secure version or disable it if unused, and audit for unauthorized file uploads. 3) Deploy IDS/IPS signatures to detect and block repeated GET requests to /remote/logincheck and suspicious file upload attempts. 4) Monitor network traffic for unusual user-agent strings indicative of coinminer malware and isolate affected hosts immediately. 5) Harden VPN and web server configurations by disabling unnecessary services and enforcing strict access controls. 6) Conduct targeted threat hunting and log analysis focusing on the identified IP indicators to detect early compromise signs. 7) Educate security teams to recognize reconnaissance patterns to improve incident response readiness. Patch status is not explicitly confirmed in this report; organizations should consult vendor advisories for current remediation guidance.

Summary

The threat intelligence report from CIRCL OSINT Feed highlights IDS alerts involving reconnaissance and scanning activities against Fortigate VPN and Joomla CMS. Specifically, repeated GET requests to /remote/logincheck on Fortigate VPN devices relate to CVE-2023-27997, a vulnerability that may allow authentication bypass or remote code execution. Attempts to exploit the Joomla Simple File Upload Plugin vulnerability (CVE-2011-5148) were also observed, which can enable remote code execution via malicious file uploads. Additionally, network traffic consistent with Bitcoin mining malware was detected, suggesting unauthorized resource usage. Indicators include IPv4 and IPv6 addresses associated with these activities. No patches are indicated as available in this report, and no confirmed exploits in the wild are reported. The activity is classified as reconnaissance in the attack kill chain, representing early probing rather than active exploitation.

Indicators of compromise

IP addresses 4

2001:470:2cc:1:959:28a6:e155:b4f2ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
20.100.177.179ET WEB_SPECIFIC_APPS Joolma Simple File Upload Plugin Remote Code Execution (CVE-2011-5148)
2001:470:1:fb5:2d38:c982:3ce0:2ab7ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
99.179.145.222ET COINMINER Possible BitCoin Miner User-Agent (miner)

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:23 UTC

Indicators of compromise

IP addresses 4

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