ASEC Weekly Malware Statistics (December 5th, 2022 – December 11th, 2022)

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 December 5th, 2022 (Monday) to December 11th, 2022 (Sunday).

For the main category, downloader ranked top with 44.3%, followed by Infostealer with 28.2%, backdoor with 18.3%, ransomware with 8.5%, and CoinMiner with 0.7%.

Top 1 – Amadey

This week, Amadey Bot ranked first place with 15.9%. Amadey is a downloader that can receive commands from the attacker to download additional malware, and when info-stealing modules are used, it can collect user credentials in the infected system.

Usually, Amadey is installed by SmokeLoader which is distributed in the disguise of normal programs and crack malware. In the recent days, however, Amadey is being distributed to corporate users through malicious document files attached to spam mails and being used to install LockBit ransomware.

The confirmed C&C server URLs are as follows.

  • hxxp://31.41.244[.]167/v7eWcjs/index.php
  • hxxp://77.73.133[.]72/hfk3vK9/index.php
  • hxxp://193.56.146[.]194/h49vlBP/index.php
  • hxxp://31.41.244[.]237/jg94cVd30f/index.php
  • hxxp://SmgqNt3EIxXkSAsU[.]xyz/jg94cVd30f/index.php
  • hxxp://AQWe9sfiWSwPyVMJ[.]xyz/jg94cVd30f/index.php
  • hxxp://PMVqdJfUf3WlX9kI[.]]xyz/jg94cVd30f/index.php
  • hxxp://85.209.135[.]109/jg94cVd30f/index.php

Top 2 – BeamWinHTTP

BeamWinHTTP is a downloader malware that ranked second with 12.4%. 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.

The confirmed C&C server URLs are as follows.

  • hxxp://45.139.105[.]171/itsnotmalware/count.php
  • hxxp://85.208.136[.]148/onemore.php

Top 3 – AgentTesla

AgentTesla is an Infostealer that ranked third place with 11.8%. It leaks user credentials saved in web browsers, emails, and FTP clients.

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.

  • Telegram API : hxxps://api.telegram[.]org/bot5792273343:AAEA9U7DCI4qHTq4iHfT5XkdD5IEsA0KtTo/sendDocument
  • SMTP Server : mail.pumaelektrik.com
    User cs@pumaelektrik.com
    Password : csp******23
    Receiver officeforward2@gmail.com
  • SMTP Server : smtp.yandex.com
    User prince.omd@yandex.com
    Password : uomwsv******xboa
    Receiver prince.omd@yandex.com
  • SMTP Server usf.hu
    User : backup@usf.hu
    Password : 52***5
    Receiver johnson22@consultant.com

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.

  • commercial invoice-AD1-2001028L..exe
  • new order.exe
  • order.exe
  • RQT-0678051000.pif
  • RFQ-TPS53513RVER -TI 30K.exe
  • Payment copy $25000.exe
  • RFQ#223090101010.pdf.exe
  • transaction_history_2022121-15712.exe

Top 4 – SmokeLoader

SmokeLoader is an Infostealer/downloader malware that is distributed via exploit kits. This week, it ranked fourth place with 11.6%. 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.

  • hulimudulinu[.]net
  • stalnnuytyt[.]org
  • nuluitnulo[.]me
  • youyouumenia5[.]org
  • guluiiiimnstra[.]net
  • akmedia[.]in/js/k/index.php
  • bethesdaserukam[.]org/setting/k/index.php
  • stemschools[.]in/js/k/index.php
  • dejarestaurant[.]com/wp-admin/js/k/index.php
  • moabscript[.]ir/wp-admin/js/k/index.php
  • nicehybridseeds[.]com/image/catalog/k/index.php
  • imaker[.]io/picktail/js/k/index.php
  • nanavatisworld[.]com/assets/js/k/index.php
  • smartbubox[.]com/img/k/index.php
  • krigenpharmaceuticals[.]com/js/k/index.php

Top 5 – Formbook

Formbook ranked fifth place with 5.9%.

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

  • New Purchase Order Ref_00256754.exe
  • RFQ#20200318.xlsx

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.sathunter[.]site/tpd2/
  • hxxp://www.blemchi[.]xyz/ng04/
  • hxxp://www.tacosmina[.]info/n2hm/
  • hxxp://www.eroptik[.]online/j17j/
  • hxxp://www.zugaro[.]xyz/gs25/
  • hxxp://www.cvbiop[.]xyz/pr28/
  • hxxp://www.lalalanowa[.]info/q4k5/
  • hxxp://www.crtinha[.]xyz/s20g/
  • hxxp://www.haremp[.]xyz/tc10/
  • hxxp://www.hampyko[.]online/a19i/
  • hxxp://www.gawiul[.]xyz/mi08/

Subscribe to AhnLab’s next-generation threat intelligence platform ‘AhnLab TIP’ to check related IOC and detailed analysis information.

Categories:Statistics

Tagged as:,

0 0 votes
Article Rating
guest

0 Comments
Inline Feedbacks
View all comments