TSPY_ZBOT.AEBR
PWS:Win32/Zbot.CIA (Microsoft); RDN/Ransom!eh (McAfee); Trojan.Gen (Symantec); Trojan-Ransom.Win32.Foreign.kzhx (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt3.AGBP (AVG)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
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.
It deletes itself after execution.
TECHNICAL DETAILS
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 creates the following folders:
- %User Profile%\Application Data\Nycyu
- %User Profile%\Application Data\Iqerip
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Leax
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnStartLocation = "1463841"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnEndLocation = "1669337"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeError = "Insufficient free space"
(Note: The default value data of the said registry entry is Not Run.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeComplete = "No"
(Note: The default value data of the said registry entry is No.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
LcnEndLocation = "1632473"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Dfrg\BootOptimizeFunction
OptimizeComplete = "Yes"
(Note: The default value data of the said registry entry is No.)
Dropping Routine
This spyware drops the following files:
- %User Profile%\Nycyu\tecox.exe
- %User Profile%\Iqerip\nedi.esz
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other Details
This spyware deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
Delete this registry key
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
- Leax
Step 3
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: LcnStartLocation = "1463841"
To: LcnStartLocation = ""0""
- From: LcnStartLocation = "1463841"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: LcnEndLocation = "1669337"
To: LcnEndLocation = ""0""
- From: LcnEndLocation = "1669337"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: OptimizeError = "Insufficient free space"
To: OptimizeError = ""Not Run""
- From: OptimizeError = "Insufficient free space"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: OptimizeComplete = "No"
To: OptimizeComplete = ""No""
- From: OptimizeComplete = "No"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: LcnEndLocation = "1632473"
To: LcnEndLocation = ""0""
- From: LcnEndLocation = "1632473"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
- From: OptimizeComplete = "Yes"
To: OptimizeComplete = ""No""
- From: OptimizeComplete = "Yes"
Step 4
Search and delete these components
- %User Profile%\Nycyu\tecox.exe
- %User Profile%\Iqerip\nedi.esz
Step 5
Search and delete these folders
- %User Profile%\Application Data\Nycyu
- %User Profile%\Application Data\Iqerip
Step 6
Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.AEBR. 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.
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