TSPY_ZBOT.YUYAJC
PWS:Win32/Zbot!VM (Microsoft); Trojan-Spy.Win32.Zbot.vyla (Kaspersky); Win32/Spy.Zbot.ABV (ESET-NOD32)
Windows
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
492,544 bytes
EXE
Yes
13 Oct 2015
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 files:
- %User Temp%\IXP000.TMP\B.exe - delete afterwards
- %User Temp%\IXP000.TMP\B.ex_ - deleted afterwards
- %User Temp%\tmp69a01950.bat - deleted afterwards
- %AppDataLocal%\CSIDL_
- %AppDataLocal%\CSIDL_X - deleted afterwards
- %User Startup%\system.pif
- %Application Data%\{random folder 1}\{random file name 1}.exe
- %Application Data%\{random folder 2}\{random file name 2}.{random extension}
- %Application Data%\{random folder 1}\{random file name 1}.ex_
(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.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %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.)
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
{random key}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
wextract_cleanup0 = "rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
EnableSPDY3_0 = "0"
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}on.com/wp-includes/images/.tmp/config.jpg
SOLUTION
9.750
11.948.04
29 Sep 2015
11.949.00
30 Sep 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- wextract_cleanup0 = "rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
- wextract_cleanup0 = "rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
- In HKEY_CURRENT_USER
- (default) = "{random hex values}"
- (default) = "{random hex values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- WarnonBadCertRecving = "0"
- WarnonBadCertRecving = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- EnableSPDY3_0 = "0"
- EnableSPDY3_0 = "0"
Step 5
Search and delete this file
- %User Temp%\IXP000.TMP\B.exe
- %User Temp%\IXP000.TMP\B.ex_
- %User Temp%\tmp69a01950.bat
- %AppDataLocal%\CSIDL_
- %AppDataLocal%\CSIDL_X - deleted afterwards
- %User Startup%\system.pif
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.YUYAJC. 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.
- %Application Data%\{random folder 1}\{random file name 1}.exe
- %Application Data%\{random folder 2}\{random file name 2}.{random extension}
- %Application Data%\{random folder 1}\{random file name 1}.ex_
- HKEY_CURRENT_USER\Software\Microsoft\{random key}
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