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 21st, 2022 (Monday) to February 27th, 2022 (Sunday).
For the main category, info-stealer ranked top with 77.9%, followed by RAT (Remote Administration Tool) malware with 15%, downloader with 2.9%, ransomware with 2.1%, banking malware with 1.7%, and backdoor with 0.4%.
Top 1 – Formbook
Formbook is an infostealer malware that ranked first place with 30%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- mv ERATO.exe
- Order file No 3028802232022.exe
- URGENT REQUEST FOR QUOTSCAN COPY_PDF_______________________________________….exe
- payment of ($288273.63).exe
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 26.7%. It is an info-stealer malware 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.aquariushotelboutique[.]com (107.180.44[.]132)
- server mail.translogship.co[.]in (103.50.163[.]138)
- server mail.wpl-india[.]com (148.163.89[.]221)
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.
- SOA JAN 2022.exe
- NEW ORDER.exe
- RULES AND FORM.exe
- NEW ORDER Nr 6543981.exe
- ORIGINAL SHIPPING DOCUMENT & BL DRAFT.exe
- 400000.Shandong Chenhong Medical catalog and price list.exe
- facturas y datos bancarios.pdf.exe
- RFQ #600019939189_10-02-2022.exe
- AWB PACKING LIST & COMMERCIAL INVOICE.exe
Top 3 – Lokibot
Lokibot ranked third place with 13.3%. It is an info-stealer malware 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.
- ENC A05-Invoice – WENLI – Process 2152022.exe
- Sewoong Ref No. MQ-3018 & MQ-3019.exe
- copia rápida.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 4 – RedLine
RedLine ranked fourth place with 4.6%. 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 4 – Remcos
This week, Remcos ranked the same as Redline, fourth place with 4.6%. Remcos is a RAT malware that carries out various commands given by the attacker such as keylogging and information leaking.
Remcos is packed with a .NET packer and is distributed as attachments of spam mails, just like AgentTesla, Formbook, and NanoCore. Recently, there are some cases where it got distributed after disguising itself as a certain tool.
The confirmed C&C server URLs of Remcos are as follows.
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