ASEC Weekly Malware Statistics (January 31st, 2022 – February 6th, 2022)

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 interesse nummer 02022022555987665.exe
  • HBL_Scan_copy.exe
  • New purchase order PO6742311pdf.exe
  • Payment advice.exe
  • payment copy.exe
  • payment_advice..exe
  • payment_copy.exe
  • PI.exe
  • purchase order_no102277.exe
  • SOA.exe
  • SWIFT_DETAILS_093424217183.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.

  • DHL_Receipt_Document_Delivery_871209,pdf.exe
  • DHL_Receipt_3-02-22._txt.exe
  • Order_No_5843.exe
  • Proforma_Invoice#09876-INV-Order.PDF.exe
  • 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:

  • 149.202.179[.]100:443
  • 103.75.201[.]4:443
  • 50.116.54[.]215:443
  • 129.232.188[.]93:443
  • 217.182.143[.]207:443
  • 129.232.188[.]93:443
  • 79.172.212[.]216:8080
  • 144.76.186[.]49:8080

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:

  • 92.255.57[.]154:11841
  • 92.255.57[.]115:11841
  • 91.243.59[.]37:61742
  • 91.243.32[.]8:20856
  • 91.243.32[.]101:1568
  • 51.79.188[.]112:7110
  • 5.206.227[.]11:63730
  • 46.8.52[.]48:9006
  • 185.215.113[.]83:60722
  • 185.215.113[.]10:39759
  • 185.183.32[.]183:80
  • 185.128.107[.]100:80
  • 185.112.83[.]135:15482
  • 157.90.17[.]156:56409
  • 116.203.252[.]195:22021

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.

  • 91.243.44[.]30:37773
  • 91.243.44[.]32:58432
  • 91.243.44[.]33:7813
  • 185.140.53[.]178:2404

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