Posted By jcleebobgatenet , February 16, 2022

ASEC Weekly Malware Statistics (February 7th, 2022 – February 13th, 2022)

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 February 7th, 2022 (Monday) to February 13th, 2022 (Sunday).

For the main category, info-stealer ranked top with 62.3%, followed by banking malware with 18.6%, RAT (Remote Administration Tool) with 13.6%, downloader with 3.4%, and ransomware with 1.3%.

Top 1 – AgentTesla

AgentTesla ranked first place with 30.9% once again. It is an info-stealer malware that leaks user credentials saved in web browsers, emails, and FTP clients.

How AgentTesla Malware is Being Distributed in Korea

Recently collected samples use the following email servers and user accounts when leaking the collected information.

server : mail.imibic[.]org
sender : facturacion@imibic[.]org
receiver : facturacion@imibic[.]org
user : facturacion@imibic[.]org
pw : 537****48!
server : mail.tuquyfood[.]com
sender : tuquyfood@tuquyfood[.]com
receiver : marketdept@davitecco[.]com
user : tuquyfood@tuquyfood[.]com
pw : Tien****23
server : mail.butterflymotors[.]com
sender : hr@butterflymotors[.]com
receiver : ellisjemie2b@gmail[.]com
user : hr@butterflymotors[.]com
pw : #ifO****n2j{

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). Multiple collected samples were disguised as files with extensions of pdf and xlsx.

DHLAWB130501923096PDF.exe
DOC.exe
DOCS.exe
IHARA RFQ_20983764_pdf.exe
INDIA HCU27GHED.exe
invoices.exe
New po docs..exe
pay.exe
Payment Slip.exe
PO211022.exe
QUOTATIONESV20220210.PDF.exe
RFQ Quotation.exe
RFQ1090212004.PDF.exe
RFQNº00024625.PDF.exe
SHIPMENT DOCUMENTS-INVOICE.exe
shipping docs BL PL.exe
SKT66800.EXE
SPECIFIC.EXE

Top 2 – Emotet

Emotet was ranked second place with 18.2%. Emotet is a banking malware that is being continuously distributed via spam mails.

Emotet Being Distributed in Korea via Excel Files

In its basic form, it is a downloader without additional features, but once installed on a system, it can download additional modules or additional malware.

Additional modules include user info-stealing modules that steal information such as web browser and e-mail credentials, and propagation module that spreads via shared folders. Additional malware strains include other banking malware such as Oakbot and Trickbot.

The following are the some of the confirmed C&C server domains for Emotet:

217.182.143[.]207:443
159.69.237[.]188:443
103.75.201[.]4:443
144.76.186[.]55:7080
51.254.140[.]238:7080
162.214.50[.]39:7080
174.136.15[.]27:8080
198.199.98[.]78:8080
185.148.168[.]220:8080
139.196.72[.]155:8080
45.118.115[.]99:8080
178.79.147[.]66:8080

Top 3 – Formbook

Formbook is an infostealer malware that ranked third place with 13.6%.

Like other info-stealer malware, it is mainly distributed through spam emails. The distributed file names are close to each other.

doc_2863910036.exe
hsbc customer information.exe
HSBC Payment Advice.exe
IMG_00945006777.exe
Order EHP 5286 2022.scr
ORDER S20220211-601.exe
PQR-380.HESS – STRUCTURE MATERIALS FOR PUNCHLIST.exe
sewoong ref no. mq-3018 & mq-3019.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.

hxxp://www.alpeshpate[.]com/mwfc/
hxxp://www.becu84ts[.]com/gcnc/
hxxp://www.besrbee[.]com/yrcy/
hxxp://www.harsors[.]com/r3hg/
hxxp://www.mefacin[.]online/k12t/
hxxp://www.minimi36[.]com/aemt/
hxxp://www.sacremots[.]com/ahb9/
hxxp://www.sacremots[.]com/tod8/

Top 4 – Lokibot

Lokibot ranked fourth place with 12.3%. It is an info-stealer malware 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.

B2B – TX 424 Feb 2022.exe
ENQUIRY LIST FEB72022.exe
PO 220208-001A.exe
PO 220209-0081A.exe
PO_FF-feb_2202F25.exe
PO-3451099 (09_02_22).exe
Purchase order.exe

As shown below, most Lokibot C&C server URLs tend to end in fre.php.

hxxp://copictory[.]cf/fashion/fre.php
hxxp://nesofirenit[.]gq/portion/fre.php
hxxp://rkfs[.]xyz/MV1/w2/fre.php
hxxp://secure01-redirect[.]net/gc18/fre.php
hxxp://secure01-redirect[.]net/gc23/fre.php
hxxp://secure01-redirect[.]net/gc26/fre.php
hxxp://sudais.com[.]pk/876/2Panel/fre.php

Top 5 – RedLine

RedLine ranked fifth place with 5.5%. 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: