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 25th, 2021 (Monday) to October 31st, 2021 (Sunday).
For the main category, info-stealer ranked top with 48.3%, followed by RAT (Remote Administration Tool) malware with 24.5%, Downloader with 18.3%, Backdoor malware with 4.6%, Ransomware with 4.1%, and Banking malware with 0.2%.
Top 1 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked first with 17.5%. 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.
Top 2 – Formbook
Formbook is an info-stealer malware that ranked second place with 16.1%.
Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.
- P-Order #102721.exe
- DELAY NOTICE – BL 做法 SO NO 6020 – 10-25 EVER LOADING 0545-046E SO6020 (W34166).exe
- Payment Receipt.pdf.exe
- DRAFT CONTRACT 0000499000-1100928777-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 – RedLine
RedLine malware was ranked third place with 14.1%. The malware steals various information such as web browser, FTP client, cryptocurrency wallet, and PC settings. It can also download additional malware by receiving commands from the C&C server.
The following are the confirmed C&C server domains for RedLine:
Top 4 – AgentTesla
AgentTesla was ranked fourth place with 12.3%. 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.
sender : email@example.com
receiver : firstname.lastname@example.org
user : email@example.com
pw : rr.@*****Lz7
sender : rahman@aldhiyafainteriors[.]com
receiver : rahman@aldhiyafainteriors[.]com
user : rahman@aldhiyafainteriors[.]com
pw : dhi*****987
sender : firstname.lastname@example.org
receiver : email@example.com
user : firstname.lastname@example.org
pw : PN****b9
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.
- Management Proposal.exe
- Ref. # IRQ-21-007783.exe
- ORIGINAL SCAN DOX.exe
- DHL airwaybill # 6913321715.pdf.exe
Top 5 – Lokibot
This week, Lokibot ranked fifth place with 8.2%. 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 distributed file names with other malware that are distributed through spam emails.
- FACTURA COMERCIAL..PDF.exe
- QRT (20211027#00001) ACSAM-6000RC Quote.exe
- PO 211028-01A.exe
- PRICE QUOTATION OCT 28.exe
- USD BANK TRANSFER COPIES.exe
- payment copy.exe
- PRICE QUOTATION OCT 28.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
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