TSPY_ZBOT.YARL
PWS:Win32/Zbot (Microsoft), Win32/Spy.Zbot.ABP trojan (ESET)
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 the initially executed copy of itself.
TECHNICAL DETAILS
280576 bytes
EXE
Yes
12 Mar 2014
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 a copy of itself in the following folders using different file names:
- %System%\{random}.exe
- %Application Data%\{random}\{random}.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random}\{random}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random}\{random}.exe"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SecurityCenterServer{value}
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SecurityCenterServer{value}
Type = "10"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SecurityCenterServer{value}
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SecurityCenterServer{value}
ImagePath = "%System%\{random.exe}
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SecurityCenterServer{value}
DisplayName = "Security Center Server - {value}"
It drops the following files:
- %Windows%\Tasks\Security Center Update - {value}.job
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}froll.com/b/eve/{value}
- http://{BLOCKED}froll.com/b/opt/{value}
- http://{BLOCKED}ompany.com/b/opt/{value}
- http://{BLOCKED}heck.com/b/opt/{value}
It deletes the initially executed copy of itself
SOLUTION
9.700
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
Restart in Safe Mode
Step 3
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\Run
- {random} = "%Application Data%\{random}\{random}.exe"
- {random} = "%Application Data%\{random}\{random}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random} = "%Application Data%\{random}\{random}.exe"
- {random} = "%Application Data%\{random}\{random}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SecurityCenterServer{value}
- ErrorControl = "1"
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SecurityCenterServer{value}
- Type = "10"
- Type = "10"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SecurityCenterServer{value}
- Start = "2"
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SecurityCenterServer{value}
- ImagePath = "%System%\{random.exe}
- ImagePath = "%System%\{random.exe}
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SecurityCenterServer{value}
- DisplayName = "Security Center Server - {value}"
- DisplayName = "Security Center Server - {value}"
Step 4
Search and delete these files
- %System%\{random}.exe
- %Application Data%\{random}\{random}.exe
- %Windows%\Tasks\Security Center Update - {value}.job
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.YARL. 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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