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 June 28th, 2021 (Monday) to July 4th, 2021 (Sunday).
For the main category, info-stealer ranked top with 67%, followed by RAT (Remote Administration Tool) malware with 13.5%, CoinMiner with 7.0%, downloader with 5.9%, Ddos with 3.4%, and ransomware with 3.1%.
Top 1 – AgentTesla
AgentTesla was ranked first place with 15.8%. It is an info-stealer malware that leaks user information saved in web browsers, e-mails, and FTP clients.
Recently collected samples use the following mail servers and user accounts when leaking the collected information.
sender : blessingss@wickwirewerehouse[.]com
receiver : blessingss@wickwirewerehouse[.]com
user : blessingss@wickwirewerehouse[.]com
pw : $Bn****u%3
sender : info@cuprum-es[.]me
receiver : info@cuprum-es[.]me
user : info@cuprum-es[.]me
pw : @Me****1.,
sender : gracebox123@vivaldi[.]net
receiver : gracebox123@vivaldi[.]net
user : gracebox123@vivaldi[.]net
pw : Codeb****er#007
As most are distributed through spam mails 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.
- New PO33134.exe
- Statement SKBMT 04418.exe
Top 2 – Formbook
Formbook is an info-stealer malware ranked in second place with 11.3%.
Like other info-stealer malware, it is mainly distributed through spam mails. The distributed file names are close to each other.
- itachi Terminal Solutions Korea Purchase Order nf 21-0649 (Please Reply).exe
- RFQ-Itachi Terminal Solutions Korea Purchase Order nf 21-0649 (Please Reply).exe
- Request For Quotation.exe
- OUTSTANDING PAYMENT REMINDER.exe
- SEOCHANG INDUSTRY Co., Ltd..exe
- product specification.exe
- ORDER REQUIREMENT.exe
- OSGE Project (Optimum Shah Gas Expansion) plan_REQUEST_PROFORMA INVOICE.exe
- New VoiceMail 2 sec.exe
- Purchase Order-36287932.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 account information 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
This week, Lokibot ranked third place with 11.0%. It is an info-stealer malware that leaks information about programs such as web browsers, mail clients, and FTP clients.
Being a malware that is distributed through spam mails, it shares similar distributed file names with other malware that are distributed through spam mails.
- Estimate RequestBK210622.exe
- Estimate Request_PO20210702.exe
- Estimate Request_PO210628.exe
- Estimate Request_PO210630.exe
- Estimate Request_PO210701.exe
- PD210629 Urgent Estimate Request.exe
- CMA – customer Advisory – Container Charges.pdf.exe
- Informe bancario.PDF__________________.exe
- invoices soa.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
Top 4 – CryptBot
This week, CryptBot malware ranked fourth with 9.9%. CryptBot is mainly distributed through malicious sites disguised as utility program download pages. Upon entering a certain keyword in the search engine, these malicious websites appear on the top page. When the PC is infected, it attempts to steal various user info and download additional malware.
The following are the C&C server URLs and additional malware download URLs of CryptBot.
- C&C1: xeilzy47[.]top/index.php
Download URL: lopcpd05[.]top/download.php?file=lv.exe
- C&C1: xeinxk65[.]top/index.php
Download URL: lopywn08[.]top/download.php?file=lv.exe
- C&C1: xeiovz21[.]top/index.php
Download URL: loppku02[.]top/download.php?file=lv.exe
- C&C1: cyprae67[.]top/index.php
Download URL: dugzay09[.]top/download.php?file=lv.exe
The distributed filenames are as follows.
Top 5 – Vidar
An infostealer / downloader malware Vidar ranked fifth place with 8.2%. Vidar not only has features such as web browser, FTP, cryptocurrency wallet address, screenshot, but also has features that can download additional malware.
C&C URLs that were used during the period are the following.
Subscribe to AhnLab’s next-generation threat intelligence platform ‘AhnLab TIP’ to check related IOC and detailed analysis information.