Executive Summary

• SGI has observed a file identified as ‘standalone-framework.js’ originating from IP address 103.181.143.216 in Jakarta, Indonesia.
• The file is currently classified as low severity but warrants further investigation due to its potential for malicious use.
• The likely objective is reconnaissance or initial access, potentially as part of a broader supply chain attack.
• The business risk level is moderate, impacting software integrity and potentially leading to data compromise.

Organizations should proactively monitor for similar files and network activity to mitigate potential risks.

Observed Activity (SGI Sensors)

On August 14, 2025, SGI sensors detected network activity involving a ‘standalone-framework.js’ file originating from an IP address in Jakarta, Indonesia. The file’s presence in network traffic indicates potential delivery or exfiltration activity. The ASN associated with the IP suggests a cloud hosting provider. Further analysis is required to determine the file’s exact purpose and potential impact.

Malware/Technique Overview

The identified file, ‘standalone-framework.js’, is classified as part of the ‘standalone-framework.js’ family. Given the filename and the lack of explicit malicious detections, we assess it as a potential component in a larger framework, possibly for reconnaissance or initial access within a targeted network. JavaScript files can be used to perform a variety of malicious activities, including:

• Loading malicious scripts from remote servers
• Collecting system information
• Performing browser-based exploitation

Given the context and origin, a potential scenario involves a supply chain compromise, where this file might be injected into legitimate software or web applications.

MITRE ATT&CK Mapping:

• T1105 – Ingress Tool Transfer
• T1592 – Gather Victim Host Information
• T1189 – Drive-by Compromise

VirusTotal Snapshot

VirusTotal analysis shows:

• Malicious detections: 0
• Undetected: 62
• Harmless: 0

The lack of malicious detections, despite a large number of vendors not identifying the file, may indicate that this is a new or targeted threat. The high number of ‘undetected’ results suggests that the file’s signature is not widely recognized as malicious.

• VirusTotal Sample

Indicators of Compromise (IoCs)

These IoCs should be monitored for at least 30 days.

Detection & Hunting

Splunk SPL:

index=* sourcetype=* SHA256="01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b" OR src_ip="103.181.143.0/24"

This query searches for events containing the SHA256 hash or originating from the specified IP range. Validate potential hits against known good software deployments to eliminate false positives.

Elastic/Kibana KQL:

(SHA256:"01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b" OR src_ip:"103.181.143.0/24")

Wazuh/OSSEC Rule Idea:

  60000
  SHA256
  01ba4719c80b6fe911b091a7c05124b64eeece964e09c058ef8f9805daca546b
  Suspicious standalone-framework.js file detected

Containment, Eradication & Recovery

1. Isolate affected systems from the network to prevent further spread.
2. Block the identified IP address (103.181.143.XXX) at the firewall.
3. Scan all systems for the ‘standalone-framework.js’ file and related artifacts.
4. Reimage any systems confirmed to be compromised.
5. Reset compromised user and service account credentials.

Communicate the incident to IT staff and executive leadership, keeping them informed of progress. Preserve evidence for forensic analysis.

Hardening & Preventive Controls

• Implement Multi-Factor Authentication (MFA) for all user accounts (NIST CSF: PR.AC-1, CIS Control 6).
• Tune Endpoint Detection and Response (EDR) systems to detect suspicious JavaScript execution (NIST CSF: DE.CM-1, CIS Control 10).
• Implement Network Segmentation to limit the blast radius of potential compromises (NIST CSF: PR.AC-4, CIS Control 14).
• Enforce Least Privilege principles for user and service accounts (NIST CSF: PR.AC-3, CIS Control 5).
• Establish Patch SLAs to ensure timely patching of vulnerabilities (NIST CSF: PR.MA-1, CIS Control 7).

Regularly review and update firewall rules to restrict unnecessary network access.

Business Impact & Risk Outlook

The potential business impact includes operational disruption, data compromise, and reputational damage. The identified threat could lead to further exploitation of vulnerabilities within the organization’s systems. Legal risks may arise if sensitive data is compromised, potentially triggering notification requirements. The reputational impact could stem from a loss of customer trust if a breach occurs.

In the next 3-6 months, we expect to see an increase in supply chain attacks targeting organizations via compromised JavaScript files and related components. Proactive monitoring and robust security controls are crucial to mitigate these risks.

Appendix

Assumptions & Data Gaps:

• Sensor name is missing.
• Network port is missing.

References:

• VirusTotal Sample

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