WORM_QBOT.BUD

INFECTION CHANNEL: Propagates via network shares, Via physical/removable drives

This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops copies of itself into network drives.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

It retrieves specific information from the affected system.

It monitors certain files. It prevents users from visiting antivirus-related websites that contain specific strings.

File size: 331,776 bytes

File type: EXE

Memory resident: Yes

INITIAL SAMPLES RECEIVED DATE: 24 марта 2011

PAYLOAD: Drops files, Downloads files, Steals information, Compromises system security

Arrival Details

This worm arrives by connecting affected removable drives to a system.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This worm drops the following copies of itself into the affected system:

%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

1a{host name}

It injects itself into the following processes as part of its memory residency routine:

IEXPLORE.EXE
EXPLORER.EXE

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random characters} = "%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename}.exe"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{legitimate application} = ""%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename}.exe" /c {path and file name of legitimate application}"

(Note: The default value data of the said registry entry is {path and file name of legitimate application}.)

Propagation

This worm drops copies of itself into network drives.

Rootkit Capabilities

This worm also has rootkit capabilities, which enables it to hide its processes and files from the user.

Dropping Routine

This worm drops the following files:

%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename1}.dll - detected as TROJ_QAKLOG.SM
%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename2}.dll - detected as Mal_Qakcfg1 (encrypted coinfiguration file)
%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random foldername}\{random filename}.dll - also detected as WORM_QBOT.BUD (dll component)

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Download Routine

This worm connects to the following URL(s) to download its component file(s):

{BLOCKED}.co.in
{BLOCKED}.in
{BLOCKED}ver.com.ua
{BLOCKED}om.ua

Information Theft

This worm s configuration file contains the following information:

Reference to the components and their corresponding random filenames in the system
IRC data
FTP hosts (upload sites)
Infection log

It accepts the following parameters:

/i - drop the dll and config file to current directory
/s - start service
/t - terminate any process with a similar filename

It retrieves the following information from the affected system:

Account name
Browsing activities
Certificates
City
Cookies
Country
IE password protected sites
IE user namesand passwords
IP address
MSN user name and password
Operating system
Outlook user name and password
Public Storage - SMTP, POP3, LDAP
System Information

It sends the gathered information to the following site/s using credentials from its configuration file:

{BLOCKED}.{BLOCKED}.134.75
ftp.{BLOCKED}formation.com
ftp.{BLOCKED}central.com
s046.{BLOCKED}xmanager.com

Other Details

This worm monitors the following files:

chrome.exe
firefox.exe
iexplore.exe
msmsgs.exe
msnmsgr.exe
opera.exe
outlook.exe
skype.exe
yahoomessenger.exe

It prevents users from visiting antivirus-related websites that contain the following strings:

.eset
agnitum
ahnlab
arcabit
avast
avg
avira
avp
bit9
bitdefender
castlecops
centralcommand
clamav
comodo
computerassociates
cpsecure
defender
drweb
emsisoft
esafe
etrust
ewido
f-prot
f-secure
fortinet
gdata
grisoft
hacksoft
hauri
ikarus
jotti
k7computing
kaspersky
malware
mcafee
networkassociates
nod32
norman
norton
panda
pctools
prevx
quickheal
rising
rootkit
securecomputing
sophos
spamhaus
spyware
sunbelt
symantec
threatexpert
trendmicro
virus
webroot.
wilderssecurity
windowsupdate

NOTES:

This worm is capable of monitoring browsing activities and logs all information related to accessed finance-related websites containing the following strings:

/cashman/
/cashplus/
/cmserver/
access.jpmorgan.com
business-eb.ibanking-services.com
businessaccess.citibank.citigroup.com
businessonline.huntington.com
cashproonline.bankofamerica.com
cpw-achweb.bankofamerica.com
directline4biz.com
directpay.wellsfargo.com
ebanking-services.com
express.53.com
ibc.klikbca.com
itreasury.regions.com
itreasurypr.regions.com
ktt.key.com
moneymanagergps.com
netconnect.bokf.com
onb.webcashmgmt.com
onlineserv/CM
premierview.membersunited.org
singlepoint.usbank.com
tmconnectweb
treas-mgt.frostbank.com
treasury.pncbank.com
web-cashplus.com

The components it downloads are saved in the folder %System Report%\Documents and Settings\All Users\Application Data\Microsoft\{random folder}\u.

This worm may also connect to Internet Relay Chat (IRC) servers and receive commands from a remote user.

Whenever a USB drive is plugged in, it randomly selects a file name in the drive and name its dropped copy as {malware file name}_{selected file name}.exe. If the drive is empty, it appends _Documents in its file name. For example, {malware_filename}_Documents.exe.

This worm does not continue its routine if its host process is any of the following:

ctfmon.exe
dbgview.exe
mirc.exe
msdev.exe
ollydbg.exe

Minimum scan engine: 9.200

First VSAPI Pattern File: 7.922.08

First VSAPI Pattern Release Date: 24 марта 2011

VSAPI OPR PATTERN-VERSION: 7.923.00

VSAPI OPR PATTERN DATE: 25 марта 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by WORM_QBOT.BUD

TROJ_QAKLOG.SM
MAL_QAKCFG1

Step 3

Identify and delete files detected as WORM_QBOT.BUD using either the Startup Disk or Recovery Console

[ learnMore ]

Step 4

Delete the registry entry with an unknown data value

[ learnMore ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random characters} = "%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random folder name}\{random file name}.exe&"

Step 5

Restore this modified registry value

[ learnMore ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- From: {legitimate application} = ""%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random folder name}\{random file name}.exe" /c {path and file name of legitimate application}"
  To: {legitimate application} = {path and file name of legitimate application}

Step 6

Search and delete these folders

[ learnMore ]

Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

%System Root%\Documents and Settings\All Users\Application Data\Microsoft\{random folder name}

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_QBOT.BUD. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

NOTES:

For step 6, please take note of the folder location of the files detected in Step 3.

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