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 10th, 2022 (Monday) to January 16th, 2022 (Sunday).
For the main category, info-stealer ranked top with 55.1%, followed by RAT (Remote Administration Tool) malware with 38.2%, downloader with 3.9%, ransomware with 1.4%, and backdoor with 1.4%.
Top 1 – AgentTesla
AgentTesla ranked first place with 28.0% 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.agenciaaros.com[.]py (51.79.119[.]220)
sender : firstname.lastname@example.org[.]py
receiver : cutechickdick@gmail[.]com
user : email@example.com[.]py
pw : icu*****@
- server : mail.meyaargroup[.]com (148.251.123[.]147)
sender : info@meyaargroup[.]com
receiver : contacto@filtrosdys[.]com
user : info@meyaargroup[.]com
pw : Me*****3$
- server : us2.smtp.mailhostbox[.]com (208.91.199[.]223)
sender : info@pacificallbd[.]com
receiver : info@pacificallbd[.]com
user : info@pacificallbd[.]com
pw : chid*****e2419
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.
- DHL Delivery Invoice AWB 2774038374.exe
- cables po 2022.exe
Top 2 – RedLine
RedLine malware ranked second place with 18.9%. 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 3 – Formbook
Formbook is an infostealer malware that ranked third place with 11.6%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- PO 4500064218 – 1,701kg DHN.exe
- shippment document.exe
- New Purchase Order #4522028497.exe
- Online banking.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 4 – Lokibot
Lokibot malware ranked fourth place with 6.3%. It is an info-stealer malware 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.
- Purchase Order_pdf.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 5 – NanoCore
NanoCore tied for fourth place with Lokibot (6.3%). It is a RAT malware developed with .NET. Like njRAT, it can perform various commands given by the attacker such as information leakage including keylogging.
Similar to AgentTesla, Formbook, AveMaria, and Remcos, the NanoCore is packed with .NET packing and distributed through attached files in spam emails. As such, the file names reported are not much different from those of other malware distributed through spam emails.
The following list is the confirmed C&C server domains for NanoCore.
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