Summary Points
- Malicious npm package "tw-pkgprobe-7731" impersonates a security tool to harvest sensitive data, including Twilio credentials, by exfiltrating environment variables and system information.
- The package targets Twilio developers, scans for specific Twilio account folders, and injects malicious code into Node.js projects, risking unauthorized access and billing fraud.
- Variations of the package exfiltrate critical Twilio credentials and perform OSINT operations on Twilio-related hosts, increasing the risk of credential theft, account compromise, and targeted reconnaissance.
Threat Overview, Attack Techniques, and Targets
Cybersecurity researchers have identified a malicious npm package called "tw-pkgprobe-7731." This package was uploaded in August 2026 by an account named "twdepprobe7731," which no longer exists. The package pretends to be a security tool used for Twilio bug-bounty tests. It appears as if it runs only inside Twilio’s sandbox environment.
The attack involves the package executing code after checking if it is inside a Twilio environment. If it confirms this, it collects system and environment information. This data is then sent to a remote webhook controlled by the attacker. Later versions focus on developers working with Twilio APIs. They search for folders related to specific Twilio account identifiers (SIDs) and, if found, inject malicious code into project files.
Version 1.0.4 added the capability to exfiltrate Twilio credentials—specifically, the account SID and auth token—potentially giving the attacker full control over Twilio accounts. Despite some versions reverting to benign functionality, the package overall seems designed to target Twilio developers by harvesting sensitive data through environment checks and code injections.
Impact, Security Implications, and Remediation Guidance
The primary concern is that the package can steal Twilio credentials. If successful, an attacker could use these credentials to perform unauthorized actions such as billing or sending messages. The package also conducts OSINT activities by probing Twilio-related hosts and AWS metadata, which can help the attacker gather more information for future attacks.
The presence of malicious code in a package that appears legitimate may weaken overall security. Developers importing this package risk exposing their Twilio accounts and sensitive data. Even if later versions drop malicious features, the potential for harm remains before detection.
Because the report does not specify detailed remediation steps, it is recommended to obtain guidance from Twilio or npm. Users should analyze their projects for the malicious package and replace it immediately. Additionally, audit environment variables and credentials stored in their projects. Always keep dependencies up to date and monitor for unusual activity associated with Twilio accounts. Finally, check for any signs of compromise or unauthorized access to critical systems, and follow best security practices provided by the relevant vendor or authority.
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ThreatIntel-V1
