ASEC Weekly Malware Statistics (October 18th, 2021 – October 24th, 2021)

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 October 18th, 2021 (Monday) to October 24th, 2021 (Sunday).

For the main category, info-stealer ranked top with 62.0%, followed by Downloader with 20.2%, RAT (Remote Administration Tool) malware with 6.7%, Backdoor with 5.3%, Ransomware with 4.2%, Banking malware with 0.9%, and CoinMiner with 0.7%.

Top 1 –  AgentTesla

AgentTesla was ranked first with 22.9%. It is an info-stealer malware that leaks user information saved in web browsers, e-mails, and FTP clients.

Recently collected samples use the following email servers and user accounts when leaking the collected information.

  • mail.securido[.]my (35.213.138[.]9)
    sender : customer.service@securido[.]my
    receiver : customer.service@securido[.]my
    user : customer.service@securido[.]my
    pw : secur*****11
  • us2.smtp.mailhostbox[.]com (208.91.198[.]143)
    sender : sales@tanimas-id[.]com
    receiver : sales@tanimas-id[.]com
    pw : !xg****3
  • mail.kpnmail[.]nl (195.121.65[.]26)
    sender : tabakspeciaalzaak.everse@kpnmail[.]nl
    receiver : mamaputmamaput175@gmail[.]com
    user : tabakspeciaalzaak.everse@kpnmail[.]nl
    pw : Gij****n1

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). Some samples have extensions disguised as document files such as pdf and xlsx or Auto CAD blueprint files such as dwg.

  • SWIFT ADVISE 230984.exe
  • SWIFT MT760_PDF 18-10-21_PDF.exe
  • RFQ-293742.8900203.exe
  • order as urgent.exe

Top 2 –  BeamWinHTTP

BeamWinHTTP is a downloader malware that ranked second with 19.1%. BeamWinHTTP 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.

The confirmed C&C server URL is as follows.

  • hxxp://45.9.20[.]13/partner/loot.php?pub=mixsix
  • hxxp://myloveart[.]top/getFile.php?source=MIX3h1

Top 3 – Formbook

Formbook is an info-stealer malware ranked third with 15.8%.

Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.

  • DELAY NOTICE (CAUQUENES V-2141E) – 出貨通知書–光國.scr
  • villarzx.exe
  • Order doc.exe
  • PO03214890.exe
  • PO 0008293.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 form grabbing. Below is the list of confirmed C&C server URLs of Formbook.

  • hxxp://www.anysignals[.]net/g53s/
  • hxxp://www.saint444[.]com/fqiq/
  • hxxp://www.cunnters[.]com/bkqi/
  • hxxp://www.bulukx[.]com/ssee/
  • hxxp://www.teneses[.]com/yjqn/

Top 4 –  Lokibot

This week, Lokibot ranked fourth place with 8.9%. It is an info-stealer malware that leaks information about programs such as web browsers, mail clients, and FTP clients.

Being a malware that is distributed through spam emails, it shares similar distributed file names with other malware spam emails.

  • List of Requested Data_5435804.exe
  • P.O#4567677 1044-185144.exe
  • APK PO# 4505435804.exe
  • TBHD_539.EXE
  • Se***ng Ref No. MQ-3018 & MQ-3019.exe
  • TDH_1366621005IMG.exe

As shown in the below, most Lokibot C&C server URLs tend to end in fre.php.

  • hxxp://frinqy[.]gq/apps/fre.php
  • hxxp://checkvim[.]com/fd7/fre.php
  • hxxp://63.250.40[.]204/~wpdemo/file.php
  • hxxp://37.0.10[.]190/non/z/pin.php
  • hxxp://74f26d34ffff049368a6cff8812f86ee[.]gq/BN111/fre.php
  • hxxp://bobbyelectronics[.]xyz/five/fre.php
  • hxxp://jinolla[.]cf/states/fre.php
  • hxxp://23.254.225[.]235/flex/fre.php

Top 5 –  Tofsee

Tofsee is a backdoor that ranked fifth with 5.3%. Tofsee is malware that is mostly distributed via exploit kit and accesses C&C to download additional malicious modules with features such as mining, spam mail, and DDoS.

The confirmed C&C server URL is as follows.

  • hxxps://defeatwax[.]ru
  • hxxps://quadoil[.]ru

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