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 January 31st, 2022 (Monday) to February 6th, 2022 (Sunday).
For the main category, info-stealer ranked top with 61.6%, followed by RAT (Remote Administration Tool) malware with 18.9%, banking malware with 11.3%, ransomware with 4.4%, and downloader with 3.8%.
Top 1 – AgentTesla
AgentTesla ranked first place with 40.3% 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 : mail.topfrozenfoodbrand[.]com
sender : webmaster@topfrozenfoodbrand[.]com
receiver : originnn222@gmail[.]com
user : webmaster@topfrozenfoodbrand[.]com
pw : Chukwud****@
- server : mail.arlus[.]es
sender : compras@arlus[.]es
receiver : zspamming@modularelect[.]com
user : compras@arlus[.]es
pw : Lg****Vz
- server : mail.jindalpackaging[.]in
sender : info@jindalpackaging[.]in
receiver : donya@fortunaship[.]com
user : info@jindalpackaging[.]in
pw : Jinda****fo##
- server : mail.melcme[.]com
sender : sales@melcme[.]com
receiver : fastonefast08@gmail[.]com
user : sales@melcme[.]com
pw : sa****7@
- server : mail.qnscont[.]com
sender : hr.dept@qnscont[.]com
receiver : support@gcsenagency[.]com
user : hr.dept@qnscont[.]com
pw : 2020****om
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.
- angebot resale.de interesse nummer 02022022555987665.exe
- New purchase order PO6742311pdf.exe
- Payment advice.exe
- payment copy.exe
- PROFORMA INVOICE.exe
- PURCHASE ORDER.exe
- purchase order_no102277.exe
Top 2 – Formbook
Formbook is an infostealer malware that ranked second place with 11.9%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- shipping invoice documents.pdf.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 – Emotet
Emotet was ranked third place with 10.7%. Emotet is a banking malware that is being continuously distributed via spam emails.
In its basic form, it is a downloader without additional features, but once installed on a system, it can download additional modules or additional malware.
Additional modules include user info-stealing modules that steal information such as web browser and e-mail credentials, and propagation module that spreads via shared folders. Additional malware strains include other banking malware such as Oakbot and Trickbot.
The following are some of the confirmed C&C server domains for Emotet:
Top 4 – RedLine
RedLine malware ranked fourth place with 7.5%. 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 4.4%. 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.
Subscribe to AhnLab’s next-generation threat intelligence platform ‘AhnLab TIP’ to check related IOC and detailed analysis information.