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 December 13th, 2021 (Monday) to December 19th, 2021 (Sunday).
For the main category, info-stealer ranked top with 63.4%, followed by RAT (Remote Administration Tool) malware with 22.0%, downloader with 7.5%, coinminer with 4.0%, banking malware and ransomware with 1.3%, and backdoor with 0.4%.
Top 1 – Formbook
Formbook is an info-stealer malware that ranked first place with 25.1%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- da*ha co., ltd.exe
- po 21 121621-112a.exe
- po 211213-0221a.exe
- po 211217-031a.exe
- po 211521-015a.exe
- sd-211213 quote.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 2 – AgentTesla
AgentTesla was ranked second place with 18.1%. 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.
- SMTP Server : mail.croatiahunt[.]com
Sender : info@croatiahunt[.]com
Receiver : t.aidinis@empire-eyewear[.]com
Password : Vila***ade852
- SMTP Server : mail.ekdantlab.co[.]in
Sender : firstname.lastname@example.org[.]in
Receiver : email@example.com[.]in
Password : mur***@123
- SMTP Server : mail.neneka[.]org
Sender : choi@neneka[.]org
Receiver : mary@neneka[.]org
Password : Nen***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.
- Purchase Order.exe
Top 3 – RedLine
RedLine malware ranked third place with 15.4%. 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 4 – Lokibot
Lokibot malware ranked fourth place with 7.5%. 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.
- SOA Invoices.exe
- PO 01-20210521.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 5 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked fifth with 7.0%. 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.
Recently, there have been numerous cases of distribution by the dropper disguised as a software crack file. The ASEC analysis team is responding to this malware using the alias ‘MulDrop.’ See the following blog post for more information on the malware.
The confirmed C&C server URL is as follows.
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