The ASEC analysis team uses the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from December 19th, 2022 (Monday) to December 25th, 2022 (Sunday).
For the main category, Infostealer ranked top with 37.3%, followed by downloader with 35.7%, backdoor with 23.9%, and ransomware with 3.1%.
Top 1 – BeamWinHTTP
BeamWinHTTP is a downloader malware that ranked top with 23.3%. 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.
- 45.139.105[.]171/itsnotmalware/count.php?sub=NOSUB&stream=mixone&substream=mixtwo
- 45.139.105[.]171/itsnotmalware/count.php?sub=/mixtwo&stream=mixtwo&substream=mixinte
- 45.139.105[.]171/itsnotmalware/count.php?sub=/mixtwo&stream=mixone&substream=mixazed
- 45.9.20[.]13/partner/loot.php?pub=mixone
- ppp-gl[.]biz/stats/1.php?pub=/mixone
- ppp-gl[.]biz/check.php?pub=mixone
Top 2 – AgentTesla
AgentTesla is an Infostealer that ranked second place with 16.1%. 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 Telegram API. The C&C information of recently collected samples is as follows.
- SMTP Server : mail.galaxybreakdown.co.za
User : accounts@galaxybreakdown.co.za
Password : e***9
Receiver : teahyunkoo@gmail.com - SMTP Server : smtp.yandex.com
User : alma.yang2@yandex.ru
Password : graceofgod@amenn
Receiver : alma.yang2@yandex.ru - SMTP Server : host39.registrar-servers.com
User : Account@nachnegg.net
Password : p****nt 1***5
Receiver : Account@nachnegg.net - SMTP Server : us2.smtp.mailhostbox.com
User : support@habitatbreks.org
Password : Hu***2
Receiver : support@habitatbreks.org
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.
- ORDER ENQIRY #093727664.exe
- PO 29388-0321.exe
- SCANNED COPY.exe
- DATA SHEET.exe
- INWARDREMITANCE48990021337565990_pdf.exe
- UPDATED SOA.exe
Top 3 – Tofsee
This week, Tofsee was ranked third with 14.6%. Tofsee is a spambot malware that isn’t found in Korea but has been in constant distribution outside Korea for a long time. For reference, Tofsee has the same packer format as SmokeLoader, Vidar Infostealer, and Stop Ransomware, suggesting that it is installed through malware strains that are distributed from malicious websites disguised as download pages for cracks and keygens of commercial software.
Tofsee is a module-based malware that can receive commands from C&C servers after infecting the target system to install and use various modules. These modules include coin mining, account credential extortion, and DDoS attack.
The confirmed C&C server URLs are as follows.
- svartalfheim[.]top:443
- jotunheim[.]name:443
Top 4 – Formbook
Formbook ranked fourth place with 7.5%.
Like other Infostealers, it is mainly distributed through spam emails. The distributed file names are close to each other.
- Invoice B72418M pdf.exe
- DHL Invoice Notification_pdf.exe
- AWB 9899691012 Clearance Doc_pdf.exe
- DKU0021176pdf.22.12.2022pdf.exe
- Payment Invoice 0102322.exe
- New Price Confirmation.exe
As Formbook is injected into normal processes (one is a running explorer.exe and the other is in system32), the malicious behaviors are performed by these normal processes. 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.
- hxxp://www.crtinha[.]xyz/s20g/
- hxxp://www.eroptik[.]online/j17j/
- hxxp://www.gawiul[.]xyz/mi08/
- hxxp://www.magenx2[.]info/x2ee/
- hxxp://www.merop[.]online/b21g/
- hxxp://www.mewzom[.]online/oi05/
- hxxp://www.peiphitan[.]com/poub/
- hxxp://www.slebuild[.]com/dcn0/
- hxxp://www.slebuild[.]com/obee/
- hxxp://www.solisdq[.]info/ugk8/
- hxxp://www.tacosmina[.]info/n2hm/
Top 5 – SnakeKeylogger
Taking fifth place with 6.2%, SnakeKeylogger is an Infostealer type of malware that leaks information such as user key inputs, system clipboards, and browser account information.
Like AgentTesla, this malware uses email servers and user accounts when leaking collected information. Aside from these, FTP, Telegram, and discord can also be used. The following is the C&C information used by recently collected samples.
- SMTP Server : us2.smtp.mailhostbox.com
User : moni@hq-blli.com
Password : nP***)8
Receiver : moni@hq-blli.com - SMTP Server : mail.impressive-edge.com
User : goobm@impressive-edge.com
Password : dG***djt
Receiver : camialfieri3@gmail.com - SMTP Server : us2.smtp.mailhostbox.com
User : info@giftwayexpress-service.com
Password : %c***t9
Receiver : info@giftwayexpress-service.com - Telegram API : hxxps://api.telegram[.]org/bot5484820495:AAGEjy8dT72vJZImmHLmeh3onMuG9LLRD5A/sendMessage[?]chat_id=5101327412
Similar to other Infostealers, it is distributed through spam mails disguised as invoices, shipment documents, and purchase orders, so the file names contain such words shown above (Invoice, Shipment, P.O. – Purchase Order).
- URGENT UPDATED SOA.exe
- 11140109927_20221220_11440490_HesapOzet.exe
- Swift.exe
- REQUEST FOR Quotations (PYRENAQUA SEAFOOD, S.L.exe
- DEBIT NOTE.exe
- 987656-098765456789987654.exe
- Revised documents.exe
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Categories:Statistics