“Vidar Strikes Again in Italy with Compromised PECs”

Summary:

The CERT-AGID has recently identified and mitigated a new malspam campaign aimed at spreading the Vidar malware. The emails, disguised as legitimate communications from an Italian company regarding unpaid invoices, contain malicious links that initiate the download of a harmful VBS file. This file executes a PowerShell script that connects to a known domain, facilitating further malicious activities.

Keypoints:

New malspam campaign identified by CERT-AGID targeting Vidar malware.

Emails appear to be from legitimate Italian companies regarding unpaid invoices.

Malicious links in emails lead to the download of harmful VBS files.

VBS files execute PowerShell scripts that connect to known malicious domains.

IoCs have been shared with PEC managers and accredited structures for mitigation.

Users are advised to be cautious with PEC communications and report suspicious emails.

MITRE Techniques

Execution (T1059): Executes scripts or commands to carry out malicious activities.

Command and Control (T1071): Utilizes known domains for maintaining communication with compromised systems.

Credential Access (T1003): May involve stealing credentials during the compromise process.

Exfiltration (T1041): Potentially exfiltrates data to external locations through established connections.

11/04/2024

The CERT-AGID has recently identified and mitigated, with the support of PEC Managers, a new malspam campaign aimed at spreading the Vidar malware. The email, which seems to originate from an Italian company, alerts the recipient about a presumed missed payment of an invoice. However, as previously observed in past campaigns, behind a formal language and a payment request lies a serious threat: a link on the word Invoice that, if clicked, initiates the download of a malicious VBS file, thereby starting a compromise chain.

The downloaded VBS file contains a long base64-encoded string from which it extracts and executes a PowerShell script:

The executed script establishes a connection to the known domain .top, to which the recognizable parameter mints13 is sent, also used for subsequent communications with other repositories.

Countermeasures

Countermeasures have already been implemented with the support of PEC Managers. The IoCs related to the campaign have been disseminated through the IoC Feed of CERT-AGID to PEC Managers and accredited structures.

It is recommended to always pay the utmost attention to communications received via PEC, especially when they contain links deemed suspicious. In case of doubt, it is always possible to forward suspected emails to the email address malware@cert-agid.gov.it.

Indicators of Compromise

In order to make public the details of today’s campaign, the detected IoCs are listed below:

Link: Download IoC

Source: Original Post

Tags: EMAIL, CREDENTIAL, EXFILTRATION