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 May 16th, 2022 (Monday) to May 22nd, 2022 (Sunday).
For the main category, info-stealer ranked top with 71.8%, followed by RAT (Remote Administration Tool) malware with 19.1%, downloader with 3.7%, ransomware with 3.3%, banking malware with 1.7%, and backdoor with 0.4%.
Top 1 – AgentTesla
AgentTesla is an infostealer that has taken first place once again with 32.8%. It is an info-stealer that leaks user credentials saved in web browsers, emails, and FTP clients.
It uses e-mail to leak collected information, and there are samples that used FTP or Discord API. C&C information of recently collected samples is as follows.
- server : mail.permagraf.com[.]mx (174.136.37[.]109)
sender : email@example.com[.]mx
receiver : firstname.lastname@example.org[.]mx
user : email@example.com[.]mx
pw : icui****@@
- server : mail.subnet-group[.]com (206.189.39[.]129)
sender : edna@subnet-group[.]com
receiver : eh746746@gmail[.]com
user : edna@subnet-group[.]com
pw : cr****h1t
- server : mail.focuzauto[.]com (188.8.131.52)
sender : whford@focuzauto[.]com
receiver : obtxxxtf@gmail[.]com
user : whford@focuzauto[.]com
pw : Gd****rd@2016
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.
- inv TS00005597.exe
- COMPROBANTE DE RETIRO SPEI No.79433161_20220520_0230_pagos_transferencia.pdf_pag
- Aviso de pago.pdf.exe
- Payment Advice.exe
- PROFORMA INVOICE.exe
Top 2 – Formbook
Formbook ranked second place with 20.3%.
Like other info-stealer, it is mainly distributed through spam emails. The distributed file names are close to each other.
- PURCHASE ORDER FOR GPI ,KAGAL MIDC.exe
- DHL SHIPMENT NOTIFICATION 1146789443.exe
- Scan -166774678237277478382394878384744 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 – Lokibot
Lokibot malware ranked third place with 14.5%. It is an info-stealer that leaks information about programs such as web browsers, email clients, and FTP clients.
Being a malware that is distributed through spam emails, it shares similar file names with other malware spam emails.
- Shipping Documents.exe
- Quote.exe garuba1.exe
- Purchase order.exe
- FedEx Receipt_AWB#5305323204643.exe
- copia rápida_pdf_____________________________.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 4 – RedLine
RedLine ranked fourth place with 8.3%. 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 – AveMaria
AveMaria ranked fifth place with 5.0%. AveMaria is RAT (Remote Administration Tool) malware with remote control feature that receives commands from the C&C server and performs a variety of malicious behaviors.
AveMaria malware has been distributed via spam emails similar to AgentTesla, Lokibot, and Formbook malware. Additionally, it is packeted and distributed in a form of .NET to bypass detection. As such, the file names reported are not much different from those of other malware distributed through spam emails.
- Yeni sipariş _WJO-001, pdf.exe
- 19042022- PL.exe
The following are the confirmed C&C servers of AveMaria.
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