IIM Feeds for adversary infrastructure chains.

IIM chain for Sekoia.io's three-part 'FSB's matryoshka' Gamaredon series (parts 1-3, 1-4 June 2026) reconstructing a January 2026 infection chain. A weaponized xHTML lure HTML-smuggles a malicious RAR that exploits CVE-2025-8088 to drop a hidden HTA (GammaPhish) into Startup. The HTA runs mshta against an operator URL (padded with a www.bbc.com decoy path) to fetch GammaLoad, an in-memory VBScript loader cascade that resolves and registry-caches its C2 through dead-drop resolvers on graph.org/Telegra.ph, Teletype.in, public Telegram channels, Write.as, Rentry.co, Mastodon and Cloudflare Workers, with Cloudflare quick tunnels fronting the operator origin. The operator runs a rapidly rotated fleet of dedicated hosts (55 servers in 12 days, ~24h average lifespan) that serve VBScript and signal via HTTP 200/404. GammaLoad deploys GammaWorm (propagation) and GammaSteel (fileless PowerShell stealer), which exfiltrates documents to the S3-compatible Tebi.io/AWS S3 with fallback to hard-coded operator domains.

IIM chain for GoDaddy Security research published on 2026-05-28. The report describes WordPress malware found across roughly 1,980 infected sites since July 2025. The malware uses compromised WordPress plugin/theme PHP files to fetch Steam Community profile comments, extract the commentthread_comment_text content, decode an invisible-Unicode payload with optional AES-256-CTR/PBKDF2/HMAC protection, and inject the decoded URL as frontend JavaScript through wp_enqueue_script using the handle asahi-jquery-min-bundle. The observed decoded payload URL is hxxps://hello-mywordl[.]info/js/lodash[.]core[.]min[.]js. In parallel, the same PHP malware exposes a cookie-authenticated server-side backdoor that responds to DEpjndDbNc ping cookies and accepts base64-encoded PHP replacement code through tEcaKKXEsb plus POST parameter new_code, allowing remote modification of plugin and theme files. The initial WordPress compromise vector is not confirmed by GoDaddy, so this chain starts at the confirmed infected PHP/plugin/theme layer and records initial access as a limitation rather than inventing a vulnerable plugin, stolen credential, or supply-chain path.

IIM chain for Seqrite Operation Dragon Weave, published 2026-05-29. The campaign targets Czech Republic and Taiwan using a spearphishing ZIP with two delivery paths. Path A uses a PDF-masquerading LNK to launch empty.vbs and Profile.ps1, which decrypts 1.dat into RuntimeBroker_update.exe and prepares UnityPlayer.dll plus Com.dat. Path B uses a Rust executable dropper to extract the same sideloading components. Both paths converge on RuntimeBroker_update.exe loading malicious UnityPlayer.dll (RUSTCLOAK), which decrypts Com.dat and executes AZUREVEIL, an Adaptix C2 agent. AZUREVEIL uses Microsoft Azure Blob Storage as dead-drop style C2 through note1ggbbhggdwa1.blob.core.windows.net and the /note/ats/ blob path pattern.

IIM chain for the OX Security report published on 2026-05-27 about the malicious npm package mouse5212-super-formatter. The package presents itself as an internal archive deployment sync utility, but during post-installation it authenticates to GitHub using either a victim environment token or a hardcoded fallback token, checks or creates an actor-controlled repository, recursively walks the local /mnt/user-data directory, and uploads collected files through the GitHub Contents API. OX observed around seven active exfiltration sessions in the actor repository before takedown and reported 676 downloads at time of publication. The exact actor account, repository name, hardcoded token value, and package tarball hashes were not published in the text; those are intentionally not invented here.

ESET-documented Webworm infrastructure lane using Microsoft Graph / OneDrive for GraphWorm command traffic and Amazon S3 infrastructure for WormFrp-related reconnaissance/exfiltration.

ESET-documented Webworm lane targeting European government entities: malware stages from GitHub repository content and EchoCreep uses Discord API traffic as its C2 channel.

Cisco Talos-documented UAT-8302 chain in which side-loaded NetDraft/FringePorch uses Microsoft Graph / OneDrive as a C2 channel.