BKDR_CYCBOT.UE
Backdoor:Win32/Cycbot.G, Backdoor:Win32/Cycbot.G (Microsoft); BackDoor-EXI.gen.af (McAfee); Backdoor.Trojan (Symantec); Backdoor.Win32.Gbot.sjb (Kaspersky); Backdoor.Win32.Cycbot.ga (v) (Sunbelt); Gen:Variant.Barys.2570 (FSecure)
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.
TECHNICAL DETAILS
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.
Installation
This backdoor creates the following folders:
- %User Profile%\Application Data\68AD0
- %Program Files%\LP
- %Program Files%\LP\1C16
- %Program Files%\D0FD0
(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.. %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 System Modifications
This backdoor deletes the following folders:
- %User Profile%\My Documents\My Pictures
- %Start Menu%\Programs\Administrative Tools
(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.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "explorer.exe,%User Profile%\68AD0\9C01C.exe"
Dropping Routine
This backdoor drops the following files:
- %User Profile%\68AD0\9C01C.exe
(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.)
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 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 NT\CurrentVersion\Winlogon
- Shell = "explorer.exe,%User Profile%\68AD0\9C01C.exe"
Step 3
Search and delete this file
- %User Profile%\68AD0\9C01C.exe
Step 4
Search and delete these folders
- %User Profile%\Application Data\68AD0
- %Program Files%\LP
- %Program Files%\LP\1C16
- %Program Files%\D0FD0
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_CYCBOT.UE. 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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