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 14th, 2022 (Monday) to February 20th, 2022 (Sunday).
For the main category, info-stealer ranked top with 74.5%, followed by RAT (Remote Administration Tool) malware with 17.4%, banking malware with 3.9%, ransomware with 2.1%, and downloader with 2.1%.
Top 1 – AgentTesla
AgentTesla ranked first place with 34.8% once again. 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 : smtp.agahgroup[.]az (162.214.48[.]246)
sender : ceyhun@agahgroup[.]az
receiver : ceyhun@agahgroup[.]az
user : ceyhun@agahgroup[.]az
pw : AG******147
- server : mail.escueladeseguridadmaritima[.]com (160.153.132[.]203)
sender : sergio@escueladeseguridadmaritima[.]com
receiver : armkmc2017@gmail[.]com
user : sergio@escueladeseguridadmaritima[.]com
pw : SE********2020
- server : mail.pas-shipping[.]com (94.23.214[.]113)
sender : traffic@pas-shipping[.]com
receiver : rahul.kadwekar@kenngloballogistics[.]com
user : traffic@pas-shipping[.]com
pw : Chik**********1400
- server : mail.akgorbant[.]com (89.252.138[.]67)
sender : dilek.akgor@akgorbant[.]com
receiver : llogin20@yandex[.]com
user : dilek.akgor@akgorbant[.]com
pw : Ms*******xd
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.
- datos bancarios.jpg_____________________________________.exe
- Payment confirmation.exe
- Purchase Order FEB22_76543.exe
- DHL_119040 de recibopdf.exe
- Wire Transfer Copy.exe
- Inquiry SK91403BWK_products list.exe
Top 2 – Formbook
Formbook is an infostealer malware that ranked second place with 23.4%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- Eu***Tech-Purchase Order Sending.exe
- Purchase Order FEB22_76543.exe
- DELIVERY DOCUMENTS.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 3 – Lokibot
Lokibot ranked third place with 12.4%. 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.
- Se***ng Ref No. MQ-3018 & MQ-3019012.exe
- Se***ng Ref No. MQ-3018 & MQ-3019!!.exe
- se***ng ref no. mq-3018 & mq-30190 (2).exe
- PO 220215-021A.exe
- Purchase Oder Febuary List 2022.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 4 – RedLine
RedLine malware ranked fourth place with 5.0%. 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 – Remcos
This week, Remcos ranked fifth place with 4.3%. 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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