BKDR_CYCBOT.AFK
Backdoor:Win32/Cycbot.G (Microsoft); BackDoor-EXI.gen.ah (McAfee); Backdoor.Trojan (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Kazy.56336 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
281,600 bytes
EXE
Yes
28 Feb 2012
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\0BF6
- %Program Files%\D0FD0
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
056.exe = "%Program Files%\LP\0BF6\056.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\WinRAR
It adds the following registry entries:
HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "3"
(Note: The default value data of the said registry entry is 2.)
Dropping Routine
This backdoor drops the following files:
- %Program Files%\LP\0BF6\1.tmp
- %Program Files%\LP\0BF6\056.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
This report is generated via an automated analysis system.
SOLUTION
9.200
8.804.11
28 Feb 2012
8.805.00
28 Feb 2012
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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_CURRENT_USER\Software
- WinRAR
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\Run
- 056.exe = "%Program Files%\LP\0BF6\056.exe"
- In HKEY_CURRENT_USER\Software\WinRAR
- HWID = "{random values}"
Step 5
Restore this modified 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\SYSTEM\ControlSet001\Services\wscsvc
- From: Start = "3"
To: Start = "2"
- From: Start = "3"
Step 6
Search and delete these files
- %Program Files%\LP\0BF6\1.tmp
- %Program Files%\LP\0BF6\056.exe
Step 7
Search and delete these folders
- %User Profile%\Application Data\68AD0
- %Program Files%\LP
- %Program Files%\LP\0BF6
- %Program Files%\D0FD0
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CYCBOT.AFK. 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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