The ASEC analysis team is using the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from February 28th, 2022 (Monday) to March 6th, 2022 (Sunday).
For the main category, info-stealer ranked top with 67.0%, followed by RAT (Remote Administration Tool) malware with 19.0%, downloader with 6.8%, banking malware with 4.1%, ransomware with 2.7%, and backdoor with 0.5%.
Top 1 – Formbook
Formbook is an infostealer that ranked first place with 28.1%.
Like other info-stealer, it is mainly distributed through spam emails. The distributed file names are close to each other.
As Formbook is injected in a normal process that is in the directory of explorer.exe and system32, the malicious behaviors are performed by the normal process. Besides user credentials in the web browser, the malware can steal various information through keylogging, clipboard grabbing, and web browser form grabbing.
Below is the list of confirmed C&C server URLs of Formbook.
Top 2 – AgentTesla
AgentTesla ranked second place with 21.7%. It is an info-stealer that leaks user credentials saved in web browsers, emails, and FTP clients.
Recently collected samples use the following email servers and user accounts when leaking the collected information.
- server mail.modelinfra[.]com (159.89.168[.]198)
- server mail.neneka[.]org (108.167.180[.]132)
- server smtp.1and1[.]es (212.227.15[.]142)
As most are distributed through spam emails disguised as invoices, shipment documents, and purchase orders, the file names contain such words shown above (Invoice, Shipment, P.O. – Purchase Order). Multiple collected samples were disguised as files with extensions of pdf and xlsx.
Top 3 – Lokibot
Lokibot ranked third place with 14.0%. It is an info-stealer that leaks information about programs such as web browsers, email clients, and FTP clients.
Being a malware that is distributed through spam emails, it shares similar file names with other malware spam emails.
- Factura de proforma_pdf__________.exe
- Comprobante- $178.000 USD.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 4 – RedLine
RedLine ranked fourth place with 7.7%. The malware steals various information such as web browsers, FTP clients, cryptocurrency wallets, and PC settings. It can also download additional malware by receiving commands from the C&C server. Like BeamWinHTTP, there have been numerous cases of RedLine being distributed under the disguise of a software crack file.
The following are the confirmed C&C server domains for RedLine:
Top 5 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked fifth place with 6.8%. BeamWinHTTP is distributed via malware disguised as PUP installer. When it is executed, it installs PUP malware Garbage Cleaner, and can download and install additional malware at the same time.
Recently, there have been numerous cases of distribution by the dropper disguised as a software crack file. The ASEC analysis team is responding to this malware using the alias ‘MulDrop.’ See the following blog post for more information on the malware.
The confirmed C&C server URL is as follows.
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