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Introduction:
In February 2026, an employee at Context.ai downloaded a seemingly harmless Roblox cheat script — and unleashed Lumma Stealer, a sophisticated infostealer that exfiltrated Google workspace passwords, AWS keys, and OAuth tokens. The attackers then pivoted to Vercel, which had granted Context.ai “Allow All” OAuth permissions, stealing $2 million worth of credentials and environmental secrets. This incident proves that blind trust in SaaS third-party AI tools, combined with overprivileged OAuth scopes, turns a simple game cheat into a billion-dollar supply chain catastrophe.
Learning Objectives:
- Analyze how OAuth token abuse enables lateral movement from compromised SaaS providers to high-value targets.
- Implement least-privilege OAuth scopes, short-lived access tokens, and conditional access policies across Google Workspace and Microsoft 365.
- Detect, contain, and remove modern infostealers like Lumma Stealer using endpoint detection and hardened credential storage.
You Should Know:
- The Attack Chain: From Roblox Cheat to $2M Heist
The breach unfolded through a cascade of seemingly minor lapses. Below is the exact technical sequence, followed by commands to simulate and detect similar token theft.
Step‑by‑step guide:
- Initial compromise – Employee downloads `Roblox_cheat_v2.ps1` from a gaming forum. The script is actually a Lumma Stealer loader.
- Credential harvesting – Lumma Stealer dumps browser‑stored credentials, session cookies, and OAuth refresh tokens from Chrome’s local state.
- SaaS pivot – Using stolen Google OAuth refresh tokens, attackers list all authorized third‑party apps (`https://myaccount.google.com/permissions`).
- Context.ai breach – Attackers discover Context.ai’s legitimate OAuth app with `https://www.googleapis.com/auth/cloud-platform` (full GCP access).
5. Lateral movement to Vercel – Vercel had granted Context.ai “Allow All” OAuth scopes. Attackers extract Vercel’s environment variables, including database credentials and API keys.Simulate token extraction (authorized testing only):
Linux: Decrypt Chrome’s Login Data (requires user’s password) sqlite3 ~/.config/google-chrome/Default/LoginData "SELECT action_url, username_value, password_value FROM logins;" Windows (PowerShell as admin): Extract OAuth tokens from Chromium-based browsers Get-ChildItem "$env:LOCALAPPDATA\Google\Chrome\User Data\Default\Network\Cookies" | ForEach-Object { sqlite3 $_.FullName "SELECT host_key, name, encrypted_value FROM cookies WHERE name LIKE '%oauth%' OR name LIKE '%refresh%';" }Detection:
Windows: Detect Lumma Stealer registry persistence Get-ItemProperty -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Run" | Select-Object -ExpandProperty | Where-Object {$_ -match "Lumma|Roblox"}2. OAuth “Allow All” – The Hidden Front Door
Google OAuth’s default “Allow All” scope (`https://www.googleapis.com/auth/cloud-platform` or worse,
.../auth/plus.me) grants unrestricted access to Drive, Gmail, and cloud resources. Most organizations never audit which third‑party apps have excessive permissions.
Step‑by‑step audit and hardening:
- List all OAuth apps in your Google Workspace tenant:
Using gcloud CLI gcloud auth application-default login gcloud alpha identity groups memberships list [email protected] For OAuth apps audit via API curl -H "Authorization: Bearer $(gcloud auth print-access-token)" \ "https://admin.googleapis.com/admin/directory/v1/users/[email protected]/tokens"
2. Revoke overly permissive tokens:
Revoke all tokens for a specific client ID gcloud auth revoke --all --client-id=1234567890-abc.apps.googleusercontent.com
3. Enforce application‑specific restrictions in Google Cloud:
- Go to `Security` > `Access & data control` > `API controls`
– Set `Trusted apps` to “Domain wide delegation disabled” - Block unauthorized OAuth clients via `Context‑Aware Access`
Microsoft 365 equivalent (Azure AD):
Connect to MS Graph
Connect-MgGraph -Scopes "Application.Read.All", "Policy.Read.All"
List all OAuth2 permission grants
Get-MgOauth2PermissionGrant -All | Where-Object {$_.ConsentType -eq "AllPrincipals"}
Revoke a grant
Remove-MgOauth2PermissionGrant -Oauth2PermissionGrantId "grant-id"
3. Lumma Stealer – Not Your 2015 Infostealer
Lumma Stealer (aka LummaC2) is a stealthy C++‑based malware used by APT groups. It bypasses EDR through process hollowing, steals from 40+ browsers, and exfiltrates via encrypted Telegram bots.
Step‑by‑step detection and removal:
1. Check for known Lumma indicators (Windows):
Scheduled tasks
Get-ScheduledTask | Where-Object {$_.TaskName -match "Lumma|ChromeUpdate|OneDriveBackup"}
Suspicious network connections to Telegram CDN
netstat -ano | findstr ":443" | findstr "149.154.167.99"
2. Linux detection (if cross‑platform variant):
Check for hidden process masquerading as 'systemd-logind'
ps aux | grep -E "systemd-logind|chrome-sandbox" | awk '{print $2}' | xargs -I{} ls -la /proc/{}/exe
Look for unusual curl/wget in cron
crontab -l | grep -E "curl|wget|base64"
3. Containment & remediation:
- Disable internet access on affected host.
- Rotate all passwords and OAuth tokens (not just the stolen ones) – Lumma steals everything.
- Reimage the endpoint – infostealers often leave kernel‑mode rootkits.
- Hardening OAuth with Short‑Lived Tokens & Token Binding
The Vercel breach succeeded because Context.ai stored long‑lived refresh tokens (often 7–30 days) in its database. Google’s bearer tokens are also vulnerable to replay – unlike Microsoft, which supports token binding to a specific device/context.
Step‑by‑step implementation:
1. Reduce refresh token lifetime (Azure AD):
Set token lifetime policy to 60 minutes
New-AzureADPolicy -Definition @('{"TokenLifetimePolicy":{"Version":1,"AccessTokenLifetime":"01:00:00","MaxInactiveTime":"01:00:00"}}') -DisplayName "ShortLivedTokens"
Add-AzureADServicePrincipalPolicy -Id <service-principal-id> -RefObjectId <policy-id>
2. Force token binding (Microsoft only – not available in Google yet):
– Enable `Proof Key for Code Exchange (PKCE)` on all public OAuth clients.
– Configure `token binding` via `Azure AD Conditional Access` > `Session` > Use token binding.
3. For Google Workspace – eliminate server‑side refresh token storage:
– Migrate to OAuth 2.0 for TV & Devices (RFC 8628) which issues very short tokens.
– Alternatively, use Google Identity‑Aware Proxy (IAP) to avoid storing tokens on backend entirely.
Example: Verifying token binding with cURL
Extract token binding key from a Windows client (if configured) certutil -store -user My "CN=TokenBindingKey" Test if a token is bound (should fail if replayed from another machine) curl -H "Authorization: Bearer $TOKEN" -H "Sec-Token-Binding: psk" https://graph.microsoft.com/v1.0/me
5. Securing Third‑Party AI & SaaS Integrations
Every new AI tool (Context.ai, ChatGPT Enterprise, etc.) introduces a supply chain risk. Organizations must apply zero trust to SaaS‑to‑SaaS connections.
Step‑by‑step protection:
- Use OAuth scoped service accounts instead of user delegation.
– Create a dedicated Google service account with only the minimum required scopes.
– Never use “Allow All” – specify exact APIs, e.g., `https://www.googleapis.com/auth/spreadsheets.readonly`
2. Implement a proxy for all third‑party API calls (e.g., OAuth2 Proxy):
Deploy OAuth2 Proxy to inject identity and log all outgoing tokens docker run -d --name oauth2-proxy \ -v /etc/oauth2-proxy.cfg:/oauth2-proxy.cfg \ -p 4180:4180 quay.io/oauth2-proxy/oauth2-proxy --config /oauth2-proxy.cfg
3. Continuous monitoring – detect abnormal OAuth token usage:
Google Cloud Logging query for anomalous OAuth token locations log filter: "protoPayload.authorizationInfo.granted=true AND (protoPayload.requestMetadata.callerIp geoLocation.country != 'US')" Alert if a single token is used from two IPs within 5 minutes
- Incident Response: Immediate Token Revocation & Secret Rotation
When a breach like Vercel’s is discovered, minutes matter. Follow this IR playbook.
Step‑by‑step IR commands:
- Revoke all OAuth tokens for the compromised SaaS provider (one‑liner):
Azure: revoke all active sessions for a user Revoke-AzureADUserAllRefreshToken -ObjectId "[email protected]" Google: revoke tokens via API curl -X POST -H "Authorization: Bearer $ADMIN_TOKEN" \ "https://admin.googleapis.com/admin/directory/v1/users/[email protected]/tokens/CLIENT_ID/revoke"
2. Rotate all environment variables on Vercel/AWS:
Vercel CLI: regenerate all secrets vercel env rm PLAINTEXT_SECRET --yes && vercel env add PLAINTEXT_SECRET AWS: rotate IAM keys and force‑replace DB credentials aws iam create-access-key --user-name compromised-user aws iam delete-access-key --user-name compromised-user --access-key-id OLD_KEY
3. Proactively reset all “human” passwords – Lumma Stealer also grabs Active Directory hashes.
Force password change at next logon for all domain users Get-ADUser -Filter | Set-ADUser -ChangePasswordAtLogon $true
7. Supply Chain Risk Mitigation for AI Tools
Moving forward, treat every AI SaaS vendor as a potential attack vector. Vercel trusted Context.ai – Context.ai was breached via a Roblox cheat. The chain is only as strong as the weakest third‑party employee.
Step‑by‑step vendor management:
- Request SOC2 Type II + OAuth security audit from all AI vendors.
- Enforce contractual clauses requiring proof of short‑lived tokens (≤ 1 hour) and no persistent refresh token storage.
- Use a SaaS Security Posture Management (SSPM) tool (e.g., AppOmni, Obsidian) to continuously monitor OAuth grants and flag “Allow All” scopes.
- Create a “break‑glass” OAuth revocation script that blocks all third‑party apps instantly – practice it quarterly.
What Undercode Say:
- OAuth “Allow All” is a CISO’s nightmare. Organizations must shift from “trust but verify” to “never trust, always verify” – shorten token lifetimes, implement token binding, and audit every third‑party app weekly.
- A game cheat script can bankrupt a cloud giant. The Vercel hack proves that endpoint security (Lumma Stealer), identity governance (OAuth scope abuse), and supply chain risk are inseparable. A single employee’s curiosity bypasses years of perimeter defenses.
The attack chain exploited three fundamental failures: unlimited OAuth scopes, long‑lived refresh tokens stored on a vulnerable SaaS backend, and lack of token binding in Google’s implementation. Most organizations have identical blind spots. The only reason this isn’t a daily headline is because attackers prefer silent data theft over public breaches. Remediation requires a holistic zero‑trust architecture – not just for user devices, but for every API handshake between your cloud tenants.
Prediction:
By 2027, OAuth token abuse will overtake phishing as the 1 initial access vector. We will see mandatory token binding in OAuth 2.1 (similar to Microsoft’s device‑bound tokens) and government regulations banning “Allow All” scopes for any SaaS handling PII or financial data. AI supply chain attacks will spawn a new category of “third‑party AI SSPM” tools. Meanwhile, expect copycat breaches where attackers compromise a popular AI coding assistant’s OAuth app to backdoor thousands of developer environments simultaneously. The lesson: never click “Allow” without reading the fine print – and never assume your SaaS provider’s security is better than your own.
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Reported By: Erezmetula %D7%A2%D7%95%D7%91%D7%93 – Hackers Feeds
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