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Trickbot Malware Campaign Targets users with COVID-19 Themed Malspam

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Trickbot Malware Campaign

The Cyberthreat uses COVID-19 themed malspam to distribute the Trickbot malware, says IBM Security Researchers. This time attacker utilizes FMLA (Family and Medical Leave Act) to lure the user over COVID-19 medical leaves with the attachment named “Family and Medical Leave of Act 22.04.doc” to distribute the malware. Spam mail disguised to come from the U.S. Department of Labor (DoL).

Trickbot Campaigns

TrickBot is a sophisticated banking Trojan operated by an organized cybercrime gang. Users infected with the TrickBot Trojan becomes part of a botnet that can allow attackers to gain complete control of the device.
Typical consequences of TrickBot infections are bank account takeover, high-value wire fraud, and possibly ransomware attacks targeting organizational networks. Mainly financially motivated cyber-attacks.

DocuSign themes used by Trickbot

Sample email US-DoL.eml, contains three attachments: uslogo.png, faq.png, and Family and Medical Leave of Act 22.04.doc.
As first two attachments were just image files and the third one “Family and Medical Leave of Act 22.04.doc” asks users to enable macros ((ThisDocument.cls), to drops the bat file into the user machine location ”C:\Test\terop.bat”.
Trickbot Malware Campaign
Using the cURL utility, the terop.bat file attempts to download an executable from what appears to be a hijacked or compromised domain: hxxps://www.omegasystemsuae[.]com/9hfudnsfl.exe .The file is set to be written to %APPDATA%\Bio_Tecs.exe.
Terop.bat contains TIMEOUT /T 30 and ping 8.8.8.8 commands to evade detection and delay execution.
Overall, the following files are used in the infection chain:
File NameFile CategoryFile HashParent
US-DoL.emlEmailf481ba37fdcfaee9fa991e203963bad8N/A
Family and Medical Leave of Act 22.04.docCarrier Filed341215eb15167870aeff64d5380a69bUS-DoL.eml
terop.batDownloader9f52f07856cdf2b076c27ae60cb0d100Family and Medical Leave of Act 22.04.doc
faq.pngBenigneb77c6a9fc86bd73d77b92c24ca889dbUS-DoL.eml
us-logo.pngBenign1af19e6717acf7f38b8f1a651c738954US-DoL.eml
Infection chain – Trickbot
Infection chain – Trickbot This has been observed that the “Macro on Close” function used in the Docusign theme became a tactic for Trickbot distributors.
Source: GBHackers
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