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Gigabud Creates Android Work Profiles to Hide From Banking App Malware Checks
Group-IB reports the Gigabud Android banking trojan uses a cloned work profile to hide from banking app malware checks, with infections confirmed in Indonesia.
Group-IB says Gigabud installs a helper app called Vwork, derived from the open-source Shelter tool, which creates an Android work profile and drops a tampered banking app inside it, hiding the trojan from banking apps' malware scans. Gigabud, active since 2022 and linked by Group-IB to the GoldFactory group, abuses Accessibility access and overlay screens to steal credentials and run fraudulent payments while a black screen conceals the operator's actions. Group-IB confirmed the full attack chain on infected devices in Indonesia, counting about 1,469 compromised devices and estimated losses of roughly $960,000 between February and July 2026. Vwork-compatible Gigabud samples have been found targeting 11 countries including Brazil, Mexico, Indonesia, Thailand, and Türkiye, though only the Indonesian chain is confirmed.
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Outsider Phishing Kit Survives Takedown With 700 New Pages
Group-IB found the Outsider phishing kit kept generating 700+ new phishing pages within a month of Operation Ghost Hook's takedown.
Group-IB linked the Outsider Phishing Kit, operated by a threat actor known as ChenLun, to more than 100,000 phishing pages across 54+ countries between December 2025 and May 2026. After the FBI, Google, and Lumen's Black Lotus Labs seized core admin servers, a Shopify storefront, about $100,000, and thousands of domains under Operation Ghost Hook in June, over 700 new phishing domains appeared within a month. The kit offered 267 templates, adversary-in-the-middle MFA interception, WebSocket-based live operator communication, and SMS delivery via a Telegram affiliate ecosystem with more than 5,000 subscribers.
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Gigabud Uses Android App Cloning to Evade Fraud Detection
Group-IB reports the Gigabud Android banking trojan clones bank apps into isolated work profiles via the Vwork tool to evade fraud detection, with roughly $960,000 in losses in Indonesia.
Group-IB found Gigabud now ships dedicated code to work with Vwork, a weaponized fork of the open-source Android cloning app Shelter it attributes to GoldFactory, exposing cloning functions so any installed app can call them. After installing via phishing sites and messengers posing as airline, tax and government apps, operators request accessibility and overlay permissions, then clone the victim's banking app into a new work profile where it is invisible to signature-based detection in the personal profile. Fake login screens and overlays capture credentials while cloned-app transactions appear to banks as coming from an unrecognized, malware-free device. Between February and July 2026 in Indonesia, Group-IB observed about 1,469 compromised devices, 1,281 potentially compromised logins and estimated losses of roughly $960,939, with Vwork-enabled samples targeting 11 countries including Brazil, Mexico, Egypt and Thailand.
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New Android malware relays bank cards to fraudsters while victims still hold them
Group-IB discovered WindRelay Android malware that streams NFC card data in real time, paired with SpyNote RAT, targeting Czechia, Slovakia, and Slovenia.
Group-IB identified WindRelay, an Android malware that uses NFC to communicate with victims' payment cards and relays the exchange live to attacker-controlled terminals. Fraudsters impersonate bank staff by phone, trick victims into installing a personalized SpyNote RAT, then silently deploy WindRelay to cash out using the victim-entered PIN. Researchers traced 23 samples on VirusTotal from November 2025 to July 2026, four C2 IPs, and campaigns against Czechia, Slovakia, and Slovenia. No affected apps were found on Google Play, and Google Play Protect detects known versions.
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BraZetsu Malware Turns Compromised Windows Hosts Into Criminal Marketplace Inventory
Group-IB details BraZetsu, a modular Python Windows malware that monetizes compromised-host access through the Infected Marketplace for initial access brokers.
Group-IB attributes BraZetsu to the Exilware threat actor, believed to be native Portuguese speakers targeting Iberian and Latin American e-commerce, financial, industrial, and law enforcement victims. The framework, first observed in early May 2026, uses generative AI for data triage and target prioritization, steals browser histories and digital certificates, and hunts Brazilian CNAB financial remittance files. Access to compromised hosts is sold on the Infected Marketplace from roughly $5.80, letting buyers remotely deploy secondary payloads over WebSocket-linked infrastructure. Some samples evaded detection on VirusTotal; delivery likely uses VBS loaders from a domain also used to distribute the Ousaban banking trojan.
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Iran-linked hackers expand infrastructure across Europe and Middle East, report says
Group-IB found Iran-linked Tortoiseshell expanding command-and-control infrastructure into the UK, Belgium, Saudi Arabia and the UAE with new malware tooling.
Group-IB researchers identified new Tortoiseshell command-and-control infrastructure, including servers named 'uk1' and 'uk2' hosted on UK IP addresses, plus systems in Belgium, Saudi Arabia and the UAE. The Iran-linked espionage group, active since at least 2018 and previously tied to the Islamic Revolutionary Guard Corps, has historically targeted defense, aerospace, technology and military organizations in the Middle East and the United States. Researchers also uncovered new malware samples, including a backdoor resembling TwoStroke that enables command execution, file theft and system reconnaissance, and a tool establishing reverse SSH tunnels to attacker-controlled servers. Group-IB assesses that the group is expanding both its geographic reach and its capabilities and ranks it among the most active Iranian APTs of 2026.
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