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 November 21st, 2022 (Monday) to November 27th (Sunday).
For the main category, downloader ranked top with 40.3%, followed by Infostealer with 35.8%, backdoor with 16.3%, ransomware with 7.2%, and CoinMiner with 0.4%.
Top 1 – AgentTesla
AgentTesla is an Infostealer that ranked first place with 17.3%. It leaks user credentials saved in web browsers, emails, and FTP clients.
Although it uses emails (a.k.a. SMTP protocol) to leak collected information, there are samples that used FTP or Discord API. The C&C information of recently collected samples is as follows.
- SMTP Server : mail.strictfacilityservices[.]com
User : guc850155@gmail.com
Password : SFS****21
Receiver : humhum@nutiribio.com - SMTP Server : host39.registrar-servers[.]com
User : dickson@potashin.us
Password : *r4}********87G
Receiver : dickson@potashin.us - SMTP Server : smtp.yandex[.]com
User : prince.omd@yandex.com
Password : uomw********xboa
Receiver : prince.omd@yandex.com
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, and P.O. – Purchase Order). Multiple collected samples were disguised as files with extensions of pdf and xlsx.
- TNT Invoice_pdf.exe
- Quote_2200001679.exe
- Updated Qutotaion Of Accesories____PDF.exe
- Payment#0011422320_SWIFT_20222909.exe
- INVOICE_.EXE
- Transaction Invoice .exe
- POTHX221001.PDF.exe
- RFQ+Lenz Global Imports Inc.exe
- RERFQ_Lenz Global Imports Inc PDF.exe
- Wire#Confirmation0101010.pdf.exe
- PO2201101701.exe
- THX22100100012332.pdf.exe
- Inquiry #140220.pdf.exe
- MW90 CRF Port Klang_HongKong Taisung Innovase Enterprise Co. Ltd.exe
- Proof of payment.exe
- DHL AWB – 4520065422_Nov.2022.exe
- swift(USD 17043.50).exe
Top 2 – SmokeLoader
SmokeLoader is an Infostealer/downloader malware that is distributed via exploit kits. This week, it ranked second place with 14.5%. Like other malware that is distributed via exploit kits, this malware also has a MalPe form.
When executed, it injects itself into explorer.exe, and the actual malicious behavior is executed by explorer.exe. After connecting to the C&C server, it can either download additional modules or other malware strains. Additionally downloaded modules usually have Infostealer features, and explorer.exe (child process) is created and injects modules to operate.
For an analysis report related to Smoke Loader, refer to the ASEC Report below.
[PDF] ASEC REPORT vol.101_Smoke Loader Learns New Tricks
The confirmed C&C server URLs are as follows.
- host-host-file8[.]com
- host-file-host6[.]com
- cracker[.]biz
- freeshmex[.]at
- piratia[.]su
- piratia-life[.]ru
- wildweep[.]com
- o339ku32b3yk26[.]com
- o36fafs3sn6xou[.]com
- o391tckjywmtj0[.]com
Top 3 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked third place with 10.0%. The malware 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 URLs are as follows.
- hxxp://208.67.104[.]60/api/firegate.php
- hxxp://208.67.104[.]60/api/tracemap.php
- hxxp://kokoko-24[.]online/api/tracemap.php
- hxxp://megalobster[.]ru/api/tracemap.php
- hxxp://metazone1[.]com/api/tracemap.php
- hxxp://meta-zone-1[.]online/api/firegate.php
- hxxp://meta-zone-1[.]online/api/tracemap.php
- hxxp://meta-zone-1[.]ru/api/tracemap.php
Top 4 – Amadey
This week, Amadey Bot ranked fourth place with 9.6%. Amadey is a downloader that can receive commands from the attacker to download additional malware, and when info-stealing modules are used, it can collect user credentials in the infected system.
Usually, Amadey is installed by SmokeLoader which is distributed in the disguise of normal programs and crack malware. In the recent days, however, Amadey is being distributed to corporate users through malicious document files attached to spam mails and being used to install LockBit ransomware.
The confirmed C&C server URLs are as follows.
- hxxp://79.137.197[.]181/g93dLhG2/index.php
- hxxp://193.56.146[.]194/h49vlBP/index.php
- hxxp://77.73.134[.]66/o7Vsjd3a2f/index.php
Top 5 – RedLine
RedLine ranked fifth place with 9.1%. 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:
- hxxp://chardhesha[.]xyz:81
- hxxp://185.215.113[.]216:21921
- hxxp://94.103.183[.]33:80
- hxxp://80.66.87[.]11:80
- hxxp://79.137.204[.]112:80
- hxxp://160.20.109[.]26:27713
- hxxp://77.73.134[.]24:80
- hxxp://fivemonitoring[.]com:80
- hxxp://45.138.74[.]121:80
- hxxp://185.219.80[.]6:35361
- hxxp://20.126.112[.]157:16733
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Source: https://asec.ahnlab.com/en/43255/