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Introduction:
Since late December 2025, Palo Alto Networks Unit 42 has been tracking a surge in data theft and extortion incidents linked to the threat actor cluster known as BlingLibra (aka ShinyHunters). These attacks highlight a critical evolution in ransomware-less extortion, focusing on identity compromise, SaaS misconfigurations, and persistent backdoors rather than traditional malware. Organizations must pivot from perimeter defense to identity-centric security controls to mitigate these emerging threats.
Learning Objectives:
- Understand the latest TTPs (Tactics, Techniques, and Procedures) used by BlingLibra, including phishing-resistant MFA bypasses and shadow persistence.
- Learn to implement technical controls such as FIDO2 keys, verified call-back policies, and SaaS anomaly detection.
- Acquire hands-on commands for Linux and Windows to audit MFA enrollments, monitor bulk data exports, and detect unauthorized service principals.
You Should Know:
1. Defeating Phishable MFA with Hardware Keys
The Unit 42 report highlights “Phishable MFA” as a primary entry vector. Attackers use adversary-in-the-middle (AiTM) proxies to steal session tokens even when users enter a one-time password (OTP). To counter this, organizations must deploy phishing-resistant MFA, specifically FIDO2-compliant hardware keys.
Step‑by‑step guide explaining what this does and how to use it:
This guide focuses on enforcing FIDO2 in Azure AD (Entra ID) and auditing existing vulnerable authentication methods.
1. Enforce FIDO2 in Azure AD:
Navigate to the Azure Portal → Azure AD → Security → Authentication methods → Policies.
– Enable “FIDO2 Security Key” and target it to specific groups.
– Set “Require attestation” to Yes to ensure only certified hardware keys are used.
– Under “Configure”, ensure “Allow self-service setup” is set to No to prevent users from bypassing with weaker methods.
2. Audit Existing MFA Methods via PowerShell:
To identify users still relying on SMS or Voice calls, run the following AzureAD module commands (Linux/macOS using PowerShell Core or Windows PowerShell):
Connect to AzureAD
Connect-AzureAD
Get all users and their MFA methods
Get-AzureADUser -All $true | ForEach-Object {
$user = $_
$methods = Get-AzureADUserAuthenticationMethod -UserId $user.ObjectId
$methods | Where-Object { $_.AuthenticationMethodType -ne "FIDO2SecurityKey" } | Select-Object -Property @{N="User";E={$user.UserPrincipalName}}, AuthenticationMethodType
}
3. Remove Legacy Authentication Protocols:
Attackers often bypass MFA by using legacy protocols (POP3, IMAP, SMTP) that do not support MFA. Disable these via Conditional Access policies:
– Create a new Conditional Access policy.
– Assign to “All users”.
– Under “Cloud apps”, include “Office 365 Exchange Online”.
– Under “Conditions”, select “Client apps” and configure to apply to “Exchange ActiveSync clients” and “Other clients”.
– Set “Access controls” to Block.
2. Mitigating Vishing with Verified Call-Back
Social engineering, specifically vishing (voice phishing), remains a critical vulnerability. Attackers impersonate IT support to trick users into approving MFA push notifications or resetting passwords. The “Verified Call-Back” policy is a manual override process that adds a verification layer outside the compromised communication channel.
Step‑by‑step guide explaining what this does and how to use it:
This process outlines how to implement a security desk procedure that validates identity before assisting with account recovery.
- Establish a Verification Protocol: Create a standard operating procedure (SOP) where any IT service desk request for password reset or MFA removal must be accompanied by a ticket initiated via an internal ticketing system.
- Out-of-Band Verification: If a call is received claiming to be an employee, the help desk agent must terminate the call and initiate a new call to the employee’s registered company mobile number (stored in a secure HR database, not the ticketing system).
- Utilize Microsoft Identity Manager (MIM) or Similar: For high-privilege accounts (Global Admins), implement “Privileged Identity Management” (PIM) with approval workflows. Require a second approver’s physical presence or approval via a separate secure channel (like Slack with a specific MFA-locked app).
- Linux/Windows Log Analysis: To detect vishing success, monitor for sudden changes in authentication methods.
– Windows (Event Viewer): Look for Event ID 4724 (An attempt was made to reset an account’s password) and correlate with Event ID 4648 (A logon was attempted using explicit credentials) occurring outside normal business hours.
– Linux (Syslog): Monitor `/var/log/auth.log` for `passwd` changes or `sudo` escalations following a help desk ticket creation.
Search for password changes in the last hour grep "password changed" /var/log/auth.log | tail -20
3. Preventing Bulk Data Theft
The “Bulk Data Theft” weakness identified by Unit 42 refers to attackers exfiltrating massive datasets from SaaS platforms like SharePoint, AWS S3, or GitHub before triggering the extortion demand. Detection relies on establishing baselines for data transfer rates.
Step‑by‑step guide explaining what this does and how to use it:
This guide uses Microsoft Purview and AWS CloudTrail to monitor and alert on anomalous data exports.
1. Microsoft 365: Configure Purview Insider Risk Management:
- Navigate to Microsoft Purview compliance portal → Insider risk management.
- Create a policy using the template “Data leaks”.
- Set thresholds for “Unusual file downloads” and “Mass file deletion”.
- Ensure that “Integration with Microsoft 365” is enabled to correlate with user risk scores.
2. AWS: Monitor S3 Bulk Exports:
Attackers often use `aws s3 sync` commands to pull entire buckets. Configure CloudTrail to alert on these API calls.
Example AWS CloudWatch Event Pattern to detect bulk sync
{
"source": ["aws.s3"],
"detail-type": ["AWS API Call via CloudTrail"],
"detail": {
"eventName": ["ListObjectsV2", "GetObject"],
"userAgent": ["aws-cli/"],
"resources": {
"ARN": ["arn:aws:s3:::sensitive-bucket-name"]
}
}
}
3. Linux Command for Data Transfer Monitoring:
To monitor unexpected network egress on a server (if the attacker pivots), use `nethogs` or `iftop` to visualize traffic per process.
Install nethogs (Debian/Ubuntu) sudo apt install nethogs Monitor real-time per-process network usage sudo nethogs
4. Closing SaaS Permission Gaps
SaaS Permission Gaps occur when third-party applications (OAuth apps) are granted excessive privileges, such as the ability to read mail or access SharePoint files without MFA challenges. BlingLibra exploits these to establish persistence.
Step‑by‑step guide explaining what this does and how to use it:
This section covers auditing OAuth apps in Microsoft 365 and Google Workspace to revoke over-privileged grants.
1. Microsoft 365: Audit OAuth Apps with PowerShell:
List all enterprise applications and their permissions.
Connect to MSOnline
Connect-MsolService
Get all service principals with high permissions
Get-MsolServicePrincipal -All | ForEach-Object {
$perms = Get-MsolServicePrincipal -ServicePrincipalName $<em>.ServicePrincipalName | Select-Object -ExpandProperty Permissions
if ($perms -match "Mail.Read" -or $perms -match "Files.ReadWrite.All") {
Write-Host "High Risk App: $($</em>.DisplayName)" -ForegroundColor Red
$perms | Format-Table
}
}
2. Google Workspace: Review Third-Party Apps:
- Go to Admin Console → Security → API Controls.
- Navigate to “Manage Third Party App Access”.
- Set “App access control” to Limited for all untrusted domains.
- Regularly review “Apps with Gmail Access” and remove any unrecognized or unnecessary apps.
3. Implement Conditional Access for Apps:
Create a Conditional Access policy requiring “Compliant device” for any app attempting to access the “Microsoft Graph” API. This ensures even if an OAuth token is stolen, it cannot be used from a non-corporate device.
5. Detecting Shadow Persistence
Shadow persistence refers to attackers enrolling their own MFA devices or adding hidden service principals that remain active even after the primary user password is reset. This is the “Silent Failure” in incident response.
Step‑by‑step guide explaining what this does and how to use it:
Use logging and scripts to monitor for new MFA device enrollments and high-privilege service principal creations.
1. Monitor MFA Device Enrollments in Azure AD:
Configure a Log Analytics workspace to query sign-in logs for new authentication method registrations.
// KQL Query for new MFA enrollment AuditLogs | where OperationName == "User registered security info" | extend InitiatedBy = tostring(InitiatedBy.user.userPrincipalName) | project TimeGenerated, InitiatedBy, TargetResources[bash].userPrincipalName, AdditionalDetails
2. Detect Service Principal Creation (Linux/CLI):
Using the Azure CLI, create a daily audit script to look for new high-privilege applications.
Login with Azure CLI
az login --identity or use az login
List all service principals and check creation date
az ad sp list --all --query "[?createdDateTime > '2026-03-01'].{Name:displayName, Created:createdDateTime, Role:appOwnerOrganizationId}" --output table
3. Windows Command to Check Scheduled Tasks:
Attackers often use scheduled tasks for persistence after initial compromise.
List all scheduled tasks for the last 7 days (Windows)
schtasks /query /fo LIST /v | findstr /i "TaskName HostName"
Or use PowerShell to export all tasks
Get-ScheduledTask | Get-ScheduledTaskInfo | Where-Object {$_.LastRunTime -gt (Get-Date).AddDays(-7)}
What Undercode Say:
- Identity is the New Perimeter: The BlingLibra campaigns confirm that securing identities with phishing-resistant MFA is non-negotiable. Traditional MFA is no longer a defense against modern AiTM proxy attacks.
- Visibility Over SaaS Ecosystems: Organizations lack visibility into shadow IT and OAuth permission sprawl. Unit 42’s emphasis on SaaS permission gaps highlights that attackers are bypassing endpoint security entirely by moving to trusted cloud applications.
The shift from ransomware to pure extortion based on stolen data requires a corresponding shift in defensive strategy. The technical controls listed—ranging from hardware keys and verified call-backs to KQL queries and Azure CLI audits—represent a comprehensive checklist to harden environments against the tactics observed. As threat actors like ShinyHunters continue to industrialize account takeover and data exfiltration, the ability to detect and revoke unauthorized access quickly will determine whether an organization becomes a headline or a statistic.
Prediction:
As defensive controls like FIDO2 become mainstream, BlingLibra and similar groups will pivot further toward third-party SaaS integrations and supply chain compromises. Expect an increase in attacks targeting developer CI/CD pipelines and OAuth applications connected to critical infrastructure, as these represent the next frontier of identity-based extortion where traditional security tools lack visibility.
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IT/Security Reporter URL:
Reported By: Blinglibra Shinyhunters – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
