TROJ_CLEAMAN.BK

This Trojan It hooks APIs for its rootkit functionalities.

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

It does not have any downloading capability.

It does not have any information-stealing capability.

Arrival Details

This Trojan 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 Trojan drops the following files:

• %User Profile%\Application Data\dplayx.dll - also detected as TROJ_CLEAMAN.BK

(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.)

It drops the following copies of itself into the affected system:

• %User Profile%\Application Data\dplaysvr.exe

(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.)

It drops the following non-malicious file:

• %User Temp%\ayne6924.log

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• FxCUnzSQclbQl3

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
dplaysvr = "%User Profile%\Application Data\dplaysvr.exe"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan also has rootkit capabilities, which enables it to hide its processes and files from the user.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

NOTES:

Other Details

It hooks the following APIs for its rootkit functionalities:

• FindFirstFileA
• FindNextFileA
• FindFirstFileW
• FindNextFileW
• NtEnumerateValueKey
• NtResumeThread
• NtQuerySystemInformation
• LdrLoadDll
• connect

It hides all files with the following filenames:

• dplaysvr.exe
• dplayx.dll

It does not exploit any vulnerability.