BKDR_ZEGOST.RG
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
83,095 bytes
EXE
Yes
23 Jan 2014
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This backdoor registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\I00056828K\Parameters
Other System Modifications
This backdoor adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
I00056828K = "I00056828K"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\I00056828K
Description = "bebb60839bbb3bb bsdecurib0ty.dddn"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\I00056828K
zcx = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\I00056828K\Parameters
ServiceDll = "%Program Files%\I00056828K.dll"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\I00056828K
Type = "12"
Dropping Routine
This backdoor drops the following files:
- %Program Files%\I00056828K.dll
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other Details
This backdoor deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.300
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 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\I00056828K
- Parameters
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 NT\CurrentVersion\SvcHost
- I00056828K = "I00056828K"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\I00056828K
- Description = "bebb60839bbb3bb bsdecurib0ty.dddn"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\I00056828K
- zcx = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\I00056828K\Parameters
- ServiceDll = "%Program Files%\I00056828K.dll"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\I00056828K
- Type = "12"
Step 5
Search and delete this file
- %Program Files%\I00056828K.dll
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ZEGOST.RG. 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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