Executive Summary

• Sentry Global Intelligence (SGI) detected a file identified as standalone-framework.js.
• The activity originated from IP address 180.76.121.98, associated with AS38365 (Baidu Netcom Science and Technology Co., Ltd.) in Beijing, China.
• VirusTotal analysis indicates a low maliciousness score, with a large number of undetected results.
• The likely objective is currently undetermined, but the presence of a JavaScript framework warrants further investigation.
• Business risk is currently low but could escalate if the framework is used for malicious purposes in the future.

Organizations should proactively monitor for related activity and implement preventative measures to mitigate potential risks.

Observed Activity (SGI Sensors)

On August 12, 2025, SGI sensors detected network activity originating from IP address 180.76.121.98. The source IP is associated with Baidu Netcom Science and Technology Co., Ltd. in Beijing, China. The detected traffic contained a JavaScript file identified as standalone-framework.js. While VirusTotal results show a low maliciousness score, the presence of a JavaScript framework warrants further investigation to understand its purpose and potential risks.

Malware/Technique Overview

The detected file is identified as standalone-framework.js. While the VirusTotal analysis shows a low maliciousness score, the file’s nature as a JavaScript framework raises concerns. JavaScript frameworks can be used for various purposes, including legitimate web development, but can also be leveraged for malicious activities such as:

• Cross-site scripting (XSS) (T1188)
• Malicious redirects
• Credential harvesting
• Drive-by downloads

Given the origin of the activity, proactive monitoring is advised to detect any potential malicious use of the framework.

VirusTotal Snapshot

VirusTotal analysis of the detected file shows:

• Malicious detections: 0
• Undetected: 52
• Harmless: 0

While no vendors flagged the file as malicious, the large number of undetected results suggests that the file is either benign or a new/obscure threat.

• VirusTotal Sample

Indicators of Compromise (IoCs)

It is recommended to monitor these IoCs for at least 30 days.

Detection & Hunting

Splunk SPL

index=* hash="01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b"
| table _time, host, source, user

This query searches for the SHA256 hash in your logs. Validate results against known good files in your environment.

Containment, Eradication & Recovery

1. Isolate affected systems from the network to prevent further spread.
2. Block the identified IP address (180.76.121.98) at the firewall.
3. Scan systems for the presence of the standalone-framework.js file or related activity.
4. If malicious activity is confirmed, consider reimaging affected systems.
5. Reset user credentials if compromise is suspected.

Communicate the incident to IT staff and leadership. Preserve evidence for potential forensic analysis.

Hardening & Preventive Controls

• Implement Multi-Factor Authentication (MFA) for all user accounts (CIS Control 5).
• Tune Endpoint Detection and Response (EDR) systems to detect suspicious JavaScript activity (NIST CSF ID.AM-2).
• Implement Network Segmentation to limit the impact of potential compromises (NIST CSF PR.AC-3).
• Enforce Least Privilege principles to minimize the impact of compromised accounts (CIS Control 4).
• Establish Patch SLAs to ensure timely patching of vulnerabilities (CIS Control 7).

Business Impact & Risk Outlook

The current business impact is low, given the lack of confirmed malicious activity. However, potential risks include:

• Operational Disruption if the framework is used to disrupt critical systems.
• Legal and Reputational Damage if the framework is used to exfiltrate sensitive data.

Over the next 3-6 months, we expect to see an increase in the use of JavaScript frameworks for both legitimate and malicious purposes. Organizations should proactively monitor for suspicious JavaScript activity and implement robust security controls to mitigate potential risks.

Appendix

Assumptions & Data Gaps

• We assume the available VirusTotal data is accurate.
• We lack information about the specific purpose and functionality of the standalone-framework.js file.
• The specific port used for communication is unknown.

References

• VirusTotal Sample

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