bigops-chat-tmsg
This report shows the evidence for bigops-chat-tmsg@35.8.5, the only known version.
This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.
OpenSSF/OSV Malicious Advisory
imported 3mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-12036 confirms this npm version as malicious.
Advisory
MAL-2026-12036
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in bigops-chat-tmsg (npm)
Details
On require() of bigops-chat-tmsg, index.js silently loads _runtime.js (via a swallowed try/require appended after an empty stub class exposing init/version/configure). _runtime.js selects a platform-specific asset and downloads a binary from one of three string-concatenation-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, cf102-baf.workers.dev, cf103-070.workers.dev), writes it to /var/tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows impersonating a Microsoft diagnostic tool), chmods 0755, and spawns it detached via /bin/sh -c or cmd. If HTTPS fetches fail, the code falls back to a covert DNS-TXT channel at split-string-reconstructed domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru): it resolves TXT records for a chunk count on c.<domain> and reassembles a base64-encoded executable from numbered subdomain TXT responses. The package name/description advertise a chat/messaging library, but the entire real behavior is the dropper; the exported API is a do-nothing stub used as cover.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to bigops-chat-tmsg@35.8.5.
The versions list below shows the verdict for each recorded version.
- Avoid installing bigops-chat-tmsg@35.8.5. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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