Vidar Stealer 2.0: What It Is, How It Works, and How to Remove It (2026)

Three shifts matter for defenders and end users.

• Language change from C++ to C. The rewrite drops the C++ standard library, removes runtime dependencies that behavioural engines used as heuristics, and produces a leaner binary that is measurably harder to fingerprint.
• Multithreaded exfiltration. Previous Vidar versions harvested and shipped data serially. Vidar 2.0 spins per-target worker threads (browsers, wallets, cloud tokens, screenshots) and streams output concurrently, cutting the end-to-end steal window to well under a minute on a typical host.
• Direct memory injection that bypasses Chrome AppBound. AppBound encryption was Google's late-2024 response to browser cookie theft. Vidar 2.0 sidesteps it by injecting into the browser process directly and reading decrypted secrets in memory, rather than trying to attack the on-disk envelope. Every mainstream Chromium-based browser is in scope.

Lumma Stealer, until 2025 the dominant commodity infostealer, was disrupted by a coordinated takedown operation. Affiliates who lost Lumma access needed a functionally equivalent replacement, and Vidar 2.0 arrived at exactly the right moment with a faster, cleaner build. Telemetry from mainstream endpoint vendors through Q1 and Q2 2026 shows Vidar-family detections climbing to fill roughly the share Lumma previously held.

• Saved passwords from Chrome, Edge, Brave, Opera, Vivaldi, and Firefox.
• Session cookies — the single most valuable asset per host, because a live cookie skips both the login screen and the second-factor prompt.
• Autofill data: names, addresses, phone numbers, saved card details.
• 2FA-related state where it lives in the browser: TOTP browser extensions, WebAuthn credentials scoped to a device profile, and any cached recovery codes.
• Browser history, bookmarks, and downloaded-file metadata.

• Browser wallet extensions: MetaMask, Phantom, Trust Wallet, Coinbase Wallet, and comparable extensions across every Chromium and Firefox variant.
• Desktop wallet files: Exodus, Electrum, Atomic Wallet, Jaxx, Guarda, and similar hot wallets that keep encrypted key material on disk.
• Clipboard hijacking that swaps a copied cryptocurrency address for one owned by the operator at paste time.
• Directory scanning for files whose names resemble seed phrase backups (seed.txt, wallet.txt, screenshots named recovery, and so on).

• Cloud tokens for Dropbox, Google Drive, OneDrive, iCloud, AWS CLI profiles, and similar cached credentials.
• Communication app session data: Discord, Telegram desktop, Signal desktop, Slack.
• Gaming and delivery platforms: Steam, Epic Games, Battle.net, EA.
• Email client credentials where cached locally (Thunderbird, Outlook profiles).

• Text files matching operator-configured patterns anywhere under the user profile — commonly *.txt, *.rdp, notes, and password-manager exports left on disk.
• A screenshot of every connected display at collection time. That single frame often reveals open inboxes, exchange dashboards, or private chat windows.
• Tor Browser bookmarks, session state, and — where present — HiddenServiceDir key material from a local hidden service.

Sponsored search results and paid social ads point at pages that look like official download portals for popular paid tools (design suites, video editors, anti-cheat bypasses, productivity apps). The download is a signed-looking installer that runs Vidar in the background while the visible UI shows a plausible "installation failed" screen.

Password-protected ZIP or RAR archives are used to evade content scanners at the email and web gateway. Inside, the actual payload increasingly ships with a .bin extension rather than .exe, then relies on a companion loader or a shortcut file to execute it. The extension change alone defeats a surprising number of naïve email-filter rules.

Through 2026 the most productive lure has been "download the desktop client for [popular AI tool]." Victims searching for a native app for a service that only exists as a web product land on a spoof page and install a Vidar dropper wrapped around a webview shell. Any AI tool that gets sustained press coverage is cloned within days.

A Go-language loader tracked publicly as Factory-v3 has become the affiliate community's preferred delivery frame in 2026. It fetches the current Vidar 2.0 build from a rotating set of hosts, unpacks it in memory, and hands off execution — meaning the on-disk artefact is a small, ordinary-looking Go binary rather than the stealer itself. This keeps the payload out of static detections and lets operators swap versions without redistributing droppers.

Targeted phishing continues to work well against small and medium businesses. Common lures include fake invoices, fake shipping notifications, HR benefits enrolment, and — increasingly — fake vendor-security-questionnaire attachments.

Beginning in early April 2026, endpoint vendors reported a coordinated spike in Vidar 2.0 detections across US organizations, particularly in professional services and mid-market retail. The campaign paired Vidar with an XMRig cryptocurrency miner, which is atypical for a pure infostealer — the operator gets both a one-shot credential haul and a persistent revenue tail from mining Monero on the compromised host. For end users this bundle produced a distinctive symptom pattern (unexplained fan noise and high CPU) alongside the usual account-takeover signs.

Through July 2026 an EMEA-focused campaign leaned heavily on the fake AI installer lure. Sites were localised into English, French, German, Italian, and Polish. The dropper carried a signed-looking installer, a decoy webview, and a full Vidar 2.0 payload. Victims reported credential loss on email, cloud storage, and — for a smaller subset — MetaMask and Exodus wallets.

Pull the network cable or turn off Wi-Fi. This stops any in-progress exfiltration and prevents the affiliate from re-issuing commands. Do not shut down yet; the offline scanner in step 2 needs a running system.

Boot a rescue image from clean media (Windows Defender Offline, ESET SysRescue, Kaspersky Rescue Disk, or an equivalent from a vendor you already trust). A running desktop scan is not sufficient because the stealer can tamper with user-mode security tools.

This is the step that actually matters. Assume everything the browser knew is in the operator's hands. From a phone, tablet, or unrelated computer that has never touched the compromised host:

• Reset the primary email password first — it is the recovery vector for everything else.
• Then reset password-manager master passwords, exchange accounts, cloud storage, developer tools (GitHub, GitLab, cloud CLIs), and any account that touches money.
• Enable or rotate 2FA on every account that supports it.
• Sign out of every active session on Google, Microsoft, GitHub, Discord, Slack, and any exchange or SaaS console.

Passwords are only half the exposure. Any long-lived token in a browser or a config file is now in the operator's pocket. Revoke and reissue OAuth tokens, cloud-provider access keys, GitHub personal access tokens, CI/CD secrets, and any application-specific passwords.

Uninstall every browser extension you did not personally choose. If in doubt, wipe the browser profile entirely. Wallet browser extensions on the compromised host must be considered burned — generate a new wallet, on a clean device, and move funds from the old address if any remain.

Because 2026 Vidar campaigns increasingly bundle an XMRig miner, look for scheduled tasks or services referencing generic-looking executables running from %AppData%, %ProgramData%, or %Temp%. Persistent high CPU on an idle machine is the loud signal; scheduled tasks and Run-key entries are where the persistence usually hides.

For any workstation that touched primary email, financial accounts, or cryptocurrency, treat cleaning as second-best and reinstall the OS from vendor-supplied media. Restore data selectively — documents and photos, not executables and not entire user profiles.

Vidar Stealer is malware — specifically, credential-stealing malware sold as a service. It is detected as a Trojan by every mainstream antivirus vendor. Colloquially calling it a virus is fine; technically it is an infostealer Trojan.

The Vidar binary can be removed by any reputable antivirus running from a clean boot medium. Removing the binary is not the same as recovering from the theft — the credentials, cookies, wallets, and tokens it already exfiltrated remain in the operator's hands, which is why the recovery workflow above emphasises rotating passwords and revoking sessions from a clean device.

Saved browser passwords, session cookies, autofill data, cryptocurrency wallet files and browser extensions (MetaMask, Exodus, Electrum, Atomic, and more), cloud service tokens, communication app sessions, gaming platform accounts, text files matching name patterns, Tor browser data, and a screenshot of the screen at collection time.

Yes. Vidar 2.0, released on October 6, 2025, is a full rewrite from C++ to C with a multithreaded exfiltration engine and direct memory injection that bypasses Chrome's AppBound cookie encryption. The user-visible outcome — total credential loss on a compromised host — is the same, but 2.0 completes it faster and evades more static and behavioural detections.

No. Running Vidar on a machine you use for anything else will drain that machine's credentials in seconds. Even in a lab, obtaining, storing, or distributing this software carries legal risk in most jurisdictions. If you are a defender who needs to test detections, use vendor-supplied test artefacts or public sandbox reports rather than the live sample.

The clearest early signals are unexpected login notifications, sessions you did not initiate, missing cryptocurrency funds, disabled antivirus, and persistent high CPU usage from a bundled miner. If two or more of these appear together, treat the host as compromised and start the recovery workflow above.