Full Report
On May 8, 2025, GreyNoise observed a tightly coordinated and large-scale reconnaissance campaign launched from 251 malicious IP addresses, all hosted on Amazon AWS and geolocated in Japan. These IPs were active for only one day and collectively triggered 75 distinct scanning b...
Analysis Summary
# Incident Report: Coordinated One-Day Cloud Scanning Operation on May 8, 2025
## Executive Summary
On May 8, 2025, a highly synchronized, large-scale reconnaissance campaign was detected, originating from 251 cloud-hosted IP addresses in Japan. The campaign targeted 75 distinct web technologies and infrastructure components, probing for known vulnerabilities and misconfigurations over a single day. No confirmed exploitation or data compromise was observed, as the activity was primarily reconnaissance.
## Incident Details
- **Discovery Date:** May 8, 2025 (Observed by GreyNoise)
- **Incident Date:** May 8, 2025
- **Affected Organization:** Not explicitly disclosed (Observed by GreyNoise sensor network)
- **Sector:** Not specified (Broad targeting across web technologies, cloud infrastructure, and IoT)
- **Geography:** Source IP addresses geolocated in Japan (AWS infrastructure)
## Timeline of Events
### Initial Access
- **Date/Time:** May 8, 2025 (Duration: One day)
- **Vector:** Network Scanning / Vulnerability Probing
- **Details:** Campaign launched simultaneously from 251 malicious AWS IPs, executing 75 distinct scanning behaviors.
### Lateral Movement
- Not applicable. The activity was characterized as large-scale reconnaissance and did not progress to confirmed lateral movement or internal persistence.
### Data Exfiltration/Impact
- **Impact:** None observed. The activity was limited to non-intrusive scanning for publicly facing vulnerabilities and misconfigurations.
### Detection & Response
- **Detection:** Detected by the GreyNoise sensor network based on synchronized, high-volume scanning behavior and source IP attribution.
- **Response Actions:** Analysis was conducted to profile the campaign (details below).
## Attack Methodology
- **Initial Access:** Direct network scanning to identify exposure points.
- **Persistence:** Not applicable; activity was ephemeral (one day).
- **Privilege Escalation:** Not attempted during the observed reconnaissance phase.
- **Defense Evasion:** Evasion techniques were not explicitly detailed, but the synchronized, cloud-hosted nature suggests an attempt to maximize impact while minimizing individual IP lifespan.
- **Credential Access:** Not attempted.
- **Discovery:** Targeted searching for:
- Legacy CVEs (e.g., CVE-2017-5638 in Apache Struts, CVE-2014-6271 Shellshock).
- Misconfiguration Probes (e.g., exposed `.git` configs, ENV variables, CGI scripts).
- **Lateral Movement:** Not applicable.
- **Collection:** Not applicable.
- **Exfiltration:** Not applicable.
- **Impact:** Reconnaissance only.
## Impact Assessment
- **Financial:** Minimal/None observed on the analyzed sensor network.
- **Data Breach:** None.
- **Operational:** Minimal/None, consisting only of network traffic noise.
- **Reputational:** None recorded.
## Indicators of Compromise
- **Network Indicators (Defanged):** Large volume of suspicious traffic originating from centralized infrastructure (AWS, Japan geolocation).
- **File Indicators:** None observed.
- **Behavioral Indicators:** Highly centralized, synchronized scanning activity originating from a large pool of temporary IPs targeting a broad array of web application technologies (ColdFusion, Tomcat, Elasticsearch, WebLogic, WordPress, Drupal).
## Response Actions
- **Containment Measures:** Traffic was permitted to generate noise on sensors for detailed analysis, confirming the scope of the reconnaissance.
- **Eradication Steps:** Not required, as the attack sources were external cloud IPs that ceased activity after 24 hours.
- **Recovery Actions:** Security posture validation based on findings (see Recommendations).
## Lessons Learned
- Broad, coordinated scanning preceding known zero-day discoveries (such as Ivanti EPMM) is a common precursor to opportunistic exploitation.
- Attackers utilize ephemeral cloud infrastructure (AWS) to launch high-volume campaigns that operate briefly before dissipating.
- The cluster of targeted technologies (legacy CVEs and common misconfigurations) indicates a broad, automated exploit targeting common weaknesses.
## Recommendations
- **Prevention Measures for Similar Incidents:**
1. Continuously monitor and rapidly patch legacy CVEs, even in systems believed to be isolated.
2. Implement strict Content Security Policies (CSP) and review configurations to prevent the exposure of internal files (`.git` directories, ENV variables) to the public internet.
3. Enhance WAF/IPS rules to detect and block synchronized scanning patterns, especially those originating from large, temporary cloud provider ranges.
4. Maintain high vigilance and threat intelligence monitoring following large scanning events, as they often precede active exploitation attempts.