Last week, the Internet Crime Complaint Center (IC3) published a public service announcement on cybercriminals disseminating payroll-themed phishing emails. These phishing emails, often imitating financial organizations, contain alluring content such as an enticing subject line or use social engineering techniques to convince targets that the email is from a legitimate source.
Cofense Intelligence™ has observed payroll-themed phishing lures requesting targets to view an embedded link or download an attached file. The emails typically deliver credential phishing links or malware that is tasked with stealing the target’s financial and personal credentials.
Recently, Cofense Intelligence analyzed a payroll-themed phish distributing the TrickBot malware, Figure 1. While the phishing lure is simple, it does entice the recipient to view the attached document by using an eye-catching subject line and a “confidentiality notice” to convince targets of its legitimacy.
Figure 1: A payroll-themed phishing email received by Cofense Intelligence
The email has an attached Microsoft Office Excel spreadsheet containing a hostile macro script used to download and run the TrickBot malware on the target’s machine. TrickBot targets multiple financial institutions and intercepts relevant internet traffic and exfiltrates it to the threat actors via the command and control locations. TrickBot can also make use of a large suite of plugins which enable it to inject into web browsers, steal email credentials, and operate as a worm, spreading laterally within a LAN via SMB exploitation.
See anything odd in this email?
While the sender’s address (redacted) was spoofed to look internal, there are still a few things that raise red flags. First, there’s no greeting or introduction. It just launches into the message. Second, given the subject’s importance the message is very bare-bones—a single incomplete sentence not even graced by a verb. Third, if you’re not in Payroll or some other part of Finance, why would you receive this? For most recipients, the context wouldn’t make sense.
It’s important to educate and empower users to recognize and report suspicious emails. The following tips will help your users avoid falling victim:
- Attackers have the ability to make phishing emails look incredibly enticing. Verify that the email comes from a trusted source.
- Pay attention to the language of the email and note any grammar mistakes.
- Stay alert! Social engineering is a common technique used by attackers. Use caution if a suspicious email seems convincing.
- Avoid re-using passwords.
- Avoid sharing personally identifiable information (PII) over email.
- Always make sure to verify if a website is legitimate.
- If an email does seem suspicious, avoid interacting with the sender and instead report it!
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