ASEC Weekly Malware Statistics (June 5th, 2023 – June 11th, 2023)
AhnLab Security Emergency response Center (ASEC) uses the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from June 5th, 2023 (Monday) to June 11th, 2023 (Sunday).
For the main category, Infostealer ranked top with 44.6%, followed by downloader with 43.9%, backdoor with 9.5%, and ransomware with 2.0%.
Top 1 – Amadey
This week, Amadey Bot ranked first place with 30.4%. 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 recent days, however, Amadey is being distributed to corporate users through malicious document files attached to spam emails and being used to install LockBit ransomware.
Amadey Bot Being Distributed Through SmokeLoader
LockBit 3.0 Being Distributed via Amadey Bot
The confirmed C&C server URLs are as follows.
hxxp://77.91.68[.]62/wings/game/index.php
hxxp://77.91.68[.]30/music/rock/index.php
Top 2 – AgentTesla
AgentTesla is an Infostealer that ranked second place with 26.4%. It leaks user credentials saved in web browsers, emails, and FTP clients.
How AgentTesla Malware is Being Distributed in Korea
Although it uses emails (a.k.a. SMTP protocol) to leak collected information, there are samples that used FTP, Discord Webhooks, Telegram API, etc. The C&C information of recently collected samples is as follows.
SMTP Server: mail.marineclaimoffice[.]com
User: chris@marineclaimoffice[.]com
Password: kensarow****7
Receiver: chris@marineclaimoffice[.]com
SMTP Server: us2.smtp.mailhostbox[.]com
User: log3@forrwel[.]net
Password: HNnNLPY*LPY3
Receiver: log3@forrwel[.]net
Discord WebHooks: hxxps://discord[.]com/api/webhooks/1109078597697802400/N0FrBeH_8MDeAwQC9ABA0W42QcoAZqnFM0qJOcVUO9LPKp2yMw5W1mobQTkR7BtIa2e8
Telegram API: hxxps://api.telegram[.]org/bot6118510930:AAGLmjz14DOBPW-OuVj-xMJhmBoGJAqv5to/sendDocument
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.
Quotation Request.exe
Order 467589.exe
33690120233531MES_S Quote.exe
40023540MES_S Quote.exe
41570002689_20230609_05352297_HesapOzeti.exe
5314 Statement 0013167791.exe
Booking_002990pdf.exe
INVOICE_VM33020031052023.exe
MT103-draft.exe
New Order_xlsx.exe
OriginalCopy2023001982_pdf.exe
PO-5093027b.exe
RFQ_PO 211436 for Weatherbeeta pdf.exe
SOLICITUD DE PRESUPUESTO 08062023.exe
Top 3 – Guloader
GuLoader, which ranked third place with 12.8%, is a downloader malware that downloads additional malware and runs it. It was packed with Visual Basic language in the past to bypass detection, but it is now distributed in a form of an NSIS installer. It used to be known as CloudEye but got the name GuLoader because Google Drive is frequently used as a download URL. In addition to Google Drive, various URLs such as One Drive from Microsoft and Discord can also be used.
hxxp://107.172.148[.]208/blk/jzKrFwCeIEvTEpb62.bin
hxxp://107.172.148[.]208/id/ItohJUoNuBuEH73.bin
hxxp://107.172.148[.]217/cl/cc/GxwFzwcvtovTBxiVO240.bin
hxxp://107.172.148[.]217/re/rs/IRjVevieEjoNGeLpLWfDSZKIoW131.bin
hxxp://156.96.113[.]118/POVwBXwZMXSLQfyOjJ204.bin
hxxp://212.192.219[.]58/LgUXia76.bin
hxxp://34.138.169[.]8/wp-content/themes/seotheme/GXwzZXw152.bin
hxxp://78.138.105[.]156/xvNMB69.bin
hxxp://93-103-1-247.static.t-2[.]net/wordpress/wp-content/plugins/3d33e57e8d4b43cba374b2cf2ad480f6/y/mm/mmd/ScGHQrDJqjlyYsDeuBTQACc52.bin
hxxp://zhaoziliao1668[.]cn/PuTDpilZWMlYmw7.bin
hxxps://drive.google[.]com/uc?export=download&id=1BE6BAHmf3NoHDjFdwRJlJOUVWfeDM-eO
hxxps://drive.google[.]com/uc?export=download&id=1JntGzXZnkoZtzjegN4HaFkjUeolR96CA
hxxps://drive.google[.]com/uc?export=download&id=1K-sbxDlPJ-TxrtE_l-4l5bvddXLb5MZ3
hxxps://drive.google[.]com/uc?export=download&id=1TCu7G14PuLCh2gEmhGzMtc7xp72fyCOq
hxxps://drive.google[.]com/uc?export=download&id=1WDiaeKNkPyf1Q5pDiJRZhtZE_2LpKJn5
hxxps://drive.google[.]com/uc?export=download&id=1YH9fubB4nrYg6Lwvpi2mMkfl1k3mjHCY
hxxps://www.dropbox[.]com/s/zgeyqforih4yvth/guIVxDWTwsIKbwd35.bin?dl=1
hxxps://www.hadxxx[.]cf/qMvHJhXhgprKB96.bin
Instead of being downloaded in a file form, GuLoader is downloaded on memory to avoid detection, and the downloaded file is encoded, not PE. It is then executed after being decoded in the memory, downloading malware such as Infostealers (Formbook and AgentTesla) and RAT (Remcos and NanoCore).
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). Some samples have extensions disguised as document files such as pdf and xlsx or Auto CAD blueprint files such as dwg.
31883190ELECTRICAL.exe
Damages_Report.exe
DOCS-INV.PKL-778012DHL-PARCEL_INFO.exe
JUSTIFICANTE_DE_PAGO.exe
RFQ#84839_A2023_TEXHONG_TAN CANG_SAMPLES_PRODUCTS.exe
Sgevindue Formateringsproblemets.exe
Top 4 – Lokibot
Lokibot malware ranked fourth place with 8.8%. It is an Infostealer that leaks information about programs such as web browsers, email clients, and FTP clients.
Lokibot is at it Again, This Time Spreading via Purchase Order
Being a malware that is distributed through spam emails, it shares similar file names with other malware spam emails.
140300838898 JAYA SENTOSA.exe
DHL Express_#AWB.exe
DHL Receipt_6005195460.exe
FedEx Shipping Documents.exe
Maersk Line Shipping documents.exe
PSVD.exe
As shown below, most Lokibot C&C server URLs tend to end in fre.php.
hxxp://185.246.220[.]60/sirR/five/fre.php
hxxp://185.246.220[.]85/fresh/five/fre.php
hxxp://185.246.220[.]85/office2/five/fre.php
hxxp://185.246.220[.]85/project/five/fre.php
hxxp://161.35.102[.]56/~nikol/?p=143606594
hxxp://161.35.102[.]56/~nikol/?p=314875839320
hxxp://161.35.102[.]56/~nikol/?p=41491438105
hxxp://161.35.102[.]56/~nikol/?p=7398172063
hxxp://161.35.102[.]56/~nikol/?p=7855399
hxxp://161.35.102[.]56/~nikol/?p=882166721559
Top 5 – Formbook
Formbook ranked fifth place with 5.4%.
Like other Infostealers, it is mainly distributed through spam emails. The distributed file names are close to each other.
Documents.exe
ORDER.exe
PORTUGAL ORDER FOR JULY SALES PO#10-PAM USD.exe
Purchase Order RFQ# 10075311 USD.exe
RFQ-20013654.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.classychic[.]top/ad89/
hxxp://www.classychic[.]top/d5hg/
hxxp://www.cookcollectives[.]xyz/xcsl/
hxxp://www.fecoles[.]online/cx01/
hxxp://www.mexob[.]online/ga36/
hxxp://www.urbancon[.]xyz/ug6q/
hxxp://www.xysklhgf[.]xyz/ae30/
Subscribe to AhnLab’s next-generation threat intelligence platform ‘AhnLab TIP’ to check related IOC and detailed analysis information.
The post ASEC Weekly Malware Statistics (June 5th, 2023 – June 11th, 2023) appeared first on ASEC BLOG.
Article Link: ASEC Weekly Malware Statistics (June 5th, 2023 – June 11th, 2023) – ASEC BLOG
1 post – 1 participant
About The Author
