TSPY_ZBOT.SMKLL
Trojan-Spy.Win32.Zbot.uzup (Kaspersky); Mal/Zbot-SX (Sophos); W32/Zbot.AACC!tr (Fortinet); Win32:Zbot-UWT [Trj] (Avast)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It is injected into all running processes to remain memory resident.
It does not have any propagation routine.
It modifies the Internet Explorer Zone Settings.
As of this writing, the said sites are inaccessible.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
357,376 bytes
EXE
Yes
25 Jun 2015
Connects to URLs/IPs, Steals information, Downloads files
Arrival Details
This spyware 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 spyware drops the following copies of itself into the affected system:
- %Application Data%\{random foldername 1}\{random filename 1}.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following files:
- %Application Data%\{random foldername 2}\{random filename 2}.{random extension}
- %Application Data%\{random foldername 2}\{random filename 2}.tmp
- %Application Data%\{random foldername 3}\{random filename 3}.{random extension}
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops and executes the following files:
- %User Temp%\tmp{random}.bat ← use to delete initially executed copy, delete itself afterwards
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %Application Data%\{random foldername 1}
- %Application Data%\{random foldername 2}
- %Application Data%\{random foldername 3}
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It is injected into all running processes to remain memory resident.
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Local\{GUID}
- Global\{GUID}
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random} = "%Application Data%\{random foldername 1}\{random filename 1}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
{random key}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
{random key}
{random 1} = "{random hex values}"
HKEY_CURRENT_USER\Software\Microsoft\
{random key}
{random 2} = "{random hex values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Privacy
CleanCookies = "0"
Propagation
This spyware does not have any propagation routine.
Web Browser Home Page and Search Page Modification
This spyware modifies the Internet Explorer Zone Settings.
Download Routine
This spyware connects to the following URL(s) to download its configuration file:
- https://{BLOCKED}lnoejavlenieprimer.net/bmbmbm/file.php
- https://{BLOCKED}rtabilneiedelalinks.net/bmbmbm/file.php
- https://{BLOCKED}ortabilneiedelaaches.net/bmbmbm/file.php
As of this writing, the said sites are inaccessible.
Information Theft
This spyware s configuration file contains the following information:
- URLs where it downloads an updated copy of itself
- URLs where it sends its gathered information
- URLs of its target online banking and finance-related sites from where it steals the information
It gathers the following data:
- Data on cookie files (URLs)
- Email-related information such as account names, email addresses, passwords, server data, and server port
- Email information stored in the user’s Windows Address Book (WAB) file
- Online banking credentials
- Personal digital cerificate
It attempts to steal stored account information used in the following installed File Transfer Protocol (FTP) clients or file manager software:
- FlashFXP
- Ghisler Total Commander
- ipswitch ws_ftp
- Far/Far2
- martin prikryl winscp 2
- ftpware coreftp
- smartftp
Other Details
This spyware deletes the initially executed copy of itself
NOTES:
It does not inject its code in running processes which are related to the following security products:
- Rapport
- SafenSoft SysWatch
- McAfee
- McAfee Security Center
- McAfee SecurityCenter
- Symantec Client
- Symantec Protection
- Symantec Shared
- Symantec Security
- Norton Protection
- Kaspersky Security
- Kaspersky Anti-Virus
- avast! Antivirus
- AntiVir Desktop
- AVG Monitor
- AVG Service
- AVG Security
- ESET Security
- ESET Antivirus
- Microsoft Inspection
- Microsoft Malware
- Microsoft Security
SOLUTION
9.750
11.764.04
01 Jul 2015
11.765.00
02 Jul 2015
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {Random} = "%Application Data%\{random foldername 1}\{random filename 1}.exe"
- {Random} = "%Application Data%\{random foldername 1}\{random filename 1}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Privacy
- CleanCookies = "0"
- CleanCookies = "0"
Step 5
Reset Internet security settings
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.SMKLL. 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.
Step 7
The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.
- HKEY_CURRENT_USER\Software\Microsoft
- {random key}
- {random key}
- HKEY_CURRENT_USER\Software\Microsoft\{random key}
- {random 1} = "{random hex values}"
- {random 1} = "{random hex values}"
- HKEY_CURRENT_USER\Software\Microsoft\{random key}
- {random 1} = "{random hex values}"
- {random 1} = "{random hex values}"
- %Application Data%\{random folder 1}
- %Application Data%\{random folder 2}
- %Application Data%\{random folder 3}
- %Application Data%\{random folder 2}\{random file name 2}.tmp
- %Application Data%\{random folder 2}\{random file name 2}.{random extension}
- %Application Data%\{random folder 3}\{random file name 3}.{random extension}
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