ASEC Weekly Malware Statistics (January 23rd, 2023 – January 29th, 2023)

Malware Analysis
1

The ASEC analysis team uses the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from January 23rd, 2023 (Monday) to January 29th, 2023 (Sunday).

For the main category, downloader ranked top with 44.2%, followed by Infostealer with 34.3%, backdoor with 18.5%, ransomware with 2.6%, and CoinMiner with 0.4%.

Top 1 – BeamWinHTTP

BeamWinHTTP is a downloader malware that ranked top with 24.0%. The malware 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.

Malware Being Sneakily Installed in My PC-BeamWinHTTP Malware

The confirmed C&C server URLs are as follows.

  • hxxp://45.12.253[.]56/advertisting/plus.php
  • hxxp://45.12.253[.]51/publisher.php
  • hxxp://wfsdragon[.]ru/api/setStats.php
  • hxxp://37.0.11[.]41/base/api/getData.php

Top 2 – SmokeLoader

SmokeLoader is an Infostealer/downloader malware that is distributed via exploit kits. This week, it ranked second place with 19.7%. Like other malware that is distributed via exploit kits, this malware also has a MalPe form.

When executed, it injects itself into explorer.exe, and the actual malicious behavior is executed by explorer.exe. After connecting to the C&C server, it can download additional modules or other malware strains. Additionally downloaded modules usually have Infostealer features, and explorer.exe (child process) is created and injects modules to operate.

For an analysis report related to Smoke Loader, refer to the ASEC Report below.

[PDF] ASEC REPORT vol.101_Smoke Loader Learns New Tricks

The confirmed C&C server URLs are as follows.

  • hxxp://conceitosseg[.]com/upload/
  • hxxp://integrasidata[.]com/upload/
  • hxxp://ozentekstil[.]com/upload/
  • hxxp://finbelportal[.]com/upload/
  • hxxp://telanganadigital[.]com/upload/
  • hxxp://cletonmy[.]com/
  • hxxp://alpatrik[.]com/
  • hxxp://mightys[.]at/tmp/
  • hxxp://mupsin[.]ru/tmp/
  • hxxp://channelpi[.]com/tmp/
  • hxxp://mordo[.]ru/tmp/
  • hxxp://c3g6gx853u6j[.]xyz/


Top 3 – Formbook

Formbook ranked third place with 12.4%.

Like other Infostealers, it is mainly distributed through spam emails. The distributed file names are close to each other.

  • Enquiry 40320581017.exe
  • Remittance copy pdf.exe
  • Purchase Order List_pdf.exe
  • Scannedfile.exe
  • PI#000123#.exe

As Formbook is injected into normal processes (one is a running explorer.exe and the other is in system32), the malicious behaviors are performed by these normal processes. 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.

  • hxxp://www.notbokin[.]online/he2a/
  • hxxp://www.chopchity[.]site/j892/
  • hxxp://www.koyesses[.]site/k4xe/
  • hxxp://www.nbemt[.]xyz/sr23/
  • hxxp://www.ytumz[.]xyz/as48/
  • hxxp://www.vieop[.]online/sy22/
  • hxxp://www.chopchity[.]site/j892/
  • hxxp://www.mawelk[.]xyz/gn92/
  • hxxp://www.dupaxi[.]xyz/a09e/


Top 4 – AgentTesla

AgentTesla is an Infostealer that ranked fourth place with 11.6%. It leaks user credentials saved in web browsers, emails, and FTP clients.

How AgentTesla Malware is Being Distributed in Korea

Although it uses emails (a.k.a. SMTP protocol) to leak collected information, there are samples that used FTP or Telegram API. The C&C information of recently collected samples is as follows.

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, and P.O. – Purchase Order). Multiple collected samples were disguised as files with extensions of pdf and xlsx.

  • Revised Order.rar
  • statement of account.rar
  • Statement of Accounts for Jan. 2023.exe
  • 2023 Swift MT03pdf 00003747727369.exe
  • Inquiry_specification.exe


Top 5 – SnakeKeylogger

Taking fifth place with 4.7%, SnakeKeylogger is an Infostealer that leaks information such as user key inputs, system clipboards, and browser account information.

Snake Keylogger Being Distributed via Spam E-mails

Like AgentTesla, this malware uses email servers and user accounts when leaking collected information. On top of that, FTP, Telegram, and Discord may be used in its attack methods. The following is the C&C information used by the recently discovered samples.

  • SMTP Server : mail.raouf-hotels[.]com
    User : fc@raouf-hotels[.]com
    Password : ZyiA**********11660
    Receiver : justicefoxy71@gmail[.]com
  • SMTP Server : mail.dr2marking[.]com
    User : postmania@dr2marking[.]com
    Password : K03******QUl
    Receiver : webmaster@rodeojunior[.]com
  • SMTP Server : mail.siriexergy[.]com
    User : subramanyam@siriexergy[.]com
    Password : ********123
    Receiver : storm.maanh@gmail[.]com

Similar to other Infostealers, it is distributed through spam mails disguised as invoices, shipment documents, and purchase orders, so the file names contain such words shown above (Invoice, Shipment, P.O. – Purchase Order).

  • 2023 Swift MT03pdf 00003747727369.exe
  • RFQ_88987765654_PDF.exe
  • PO023010.exe

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Article Link: ASEC Weekly Malware Statistics (January 23rd, 2023 – January 29th, 2023) - ASEC BLOG