L.EXE, Prevx

Associated Malware Groups

The unsafe files using this name are associated with the malware groups:

System Back Door
Malicious Software
Malware Downloader

File Behavior

L.EXE has been seen to perform the following behavior:

Found on infected systems and resists interrogation by security products
The Process is polymorphic and can change its structure
Writes to another Process's Virtual Memory (Process Hijacking)
Executes a Process
This Process Deletes Other Processes From Disk
This process creates other processes on disk
Creates a new Background Service on the machine
Looks at the contents of the autoexec.bat file
Reads email address and phone book details
Uses DNS to retrieve the IP address for web sites
Ability to execute files automatically on your PC
Uses rootkit techniques to conceal its presence, interrogation or removal
The Process is packed and/or encrypted using a software packing process
Downloads hidden code from covert web sites
Injects code into other processes
Checks for the use of debuggers
Drops known malicious software during execution
Visits web sites on your PC without you knowing
Adds a Registry Key (RUN) to auto start Programs on system start up
Adds a Registry Key (DXCOM) to auto start Programs on system start up
Violates Windows/Vista Physical Memory Protection allowing it to look inside the data areas of other programs
Can Send email using SMTP protocols
This Process sends MIME Email
Adds products to the system registry
Can communicate with other computer systems using HTTP protocols
Removes Scheduled Tasks from the Windows task queue
Creates or uses a background service to access the Internet using HTTP protocols
Injects code into other processes
Uses hidden browser windows to connect to web sites without telling you
Opens browser pop ups
Runs Javascript code

L.EXE has been the subject of the following behavior:

Created as a new Background Service on the machine
Has code inserted into its Virtual Memory space by other programs
Executed as a Process
Created as a process on disk
Added as a Service in the System Registry Current Control Set
Terminated as a Process
Copied to multiple locations on the system
Deleted as a process from disk
Added as a Registry auto start to load Program on Boot up
Added as a Registry Key (DXCOM) to auto start Programs on system start up
Registered as a Dynamic Link Library File

Country Of Origin

The filename L.EXE was first seen on Sep 25 2007 in the following geographical regions of the Webroot community:

Denmark on Sep 25 2007
Spain on Apr 3 2008
Europe on Aug 6 2009
Belgium on Dec 15 2009
The United Kingdom on Dec 15 2009
Turkey on Oct 11 2010

File Name Aliases

L.EXE can also use the following file names:

TAJT.EXE
ICON.JPG
IMG[1].JPG
IMG.JPG
DFRZOBJ.EXE
DC2E3617.EXE
F2CB25A7.EXE
D54FAE3C.EXE
GIDCDGLP.EXE
SMARTASS.DAT
IFRAME3[n].HTM
DAD78032.EXE
L[3].EXE
L[1].EXE
X9[1].EXE
B.EXE
C.EXE
E.EXE
I.EXE
D.EXE
F.EXE
H.EXE
K.EXE
N.EXE
Q.EXE
T.EXE
W.EXE
Z.EXE
G.EXE
J.EXE
S.EXE
M.EXE
P.EXE
R.EXE
V.EXE
U.EXE
O.EXE
AB.EXE
AE.EXE
AH.EXE
AK.EXE
AN.EXE
AQ.EXE
AT.EXE
AW.EXE
FI.EXE
EX.EXE
E6.EXE
FC.EXE
EL.EXE
EU.EXE
E9.EXE
FF.EXE
E0.EXE
ER.EXE
EO.EXE
E3.EXE
X9.EXE
X6.EXE
X7.EXE
12.EXE
X7_001.EXE
84EAD192.EXE
F21774E6.EXE
24588974.EXE
99978991.EXE

Filesizes

The following file size has been seen:

21,504 bytes
51,712 bytes
201,259 bytes
209,833 bytes
198,014 bytes
64,825 bytes
202,240 bytes
140,800 bytes

File Type

The filename L.EXE refers to many versions of an executable program.

File Activity

One or more files with the name L.EXE creates, deletes, copies or moves the following files and folders:

Copies filec:\windows\fonts\F2CB25A7.EXE to c:\windows\fonts\F2CB25A7.EXE
Creates c:\windows\fonts\ECD7AF9E.DLL
Creates c:\windows\system32\cscript.exe
Opens/modifes c:\autoexec.bat
Creates c:\windows\system32\s1252929096h.dat
Deletes c:\windows\system32\s1252929096h.dat
Creates c:\windows\fonts\llk1252929096.mp3
Creates c:\windows\system32\s1252929098h.dat
Deletes c:\windows\system32\s1252929098h.dat
Creates c:\windows\system32\268473852.da
Creates c:\windows\system32\s1252929099h.dat
Deletes c:\windows\fonts\llk1252929096.mp3
Deletes c:\windows\system32\s1252929099h.dat
Creates c:\windows\system32\bg.jpg
Creates c:\windows\system32\title1.jpg
Creates c:\windows\fonts\llk1252929099.mp3
Creates c:\windows\system32\s1252929100h.da
Deletes c:\windows\system32\s1252929100h.da
Deletes c:\windows\fonts\llk1252929099.mp3
Creates c:\windows\fonts\llk1252929100.mp3
Creates c:\windows\system32\title2.jpg
Creates c:\windows\system32\tleft.jpg
Deletes c:\windows\fonts\llk1252929100.mp3
Creates c:\windows\system32\s1252929101h.dat
Deletes c:\windows\system32\s1252929101h.dat
Creates c:\windows\fonts\llk1252929101.mp3
Deletes c:\windows\fonts\llk1252929101.mp3
Creates c:\windows\system32\s1252929102h.dat
Deletes c:\windows\system32\s1252929102h.dat
Creates c:\windows\fonts\llk1252929102.mp3
Creates c:\windows\system32\tright.jpg
Deletes c:\windows\fonts\llk1252929102.mp3
Creates c:\windows\system32\s1252929103h.dat
Deletes c:\windows\system32\s1252929103h.dat
Creates c:\windows\fonts\llk1252929103.mp3
Deletes c:\windows\fonts\llk1252929103.mp3
Creates c:\windows\system32\s1252929104h.dat
Deletes c:\windows\system32\s1252929104h.dat
Creates c:\windows\fonts\llk1252929114.mp3
Deletes c:\windows\fonts\llk1252929114.mp3
Creates c:\windows\system32\s1252929114h.dat
Deletes c:\windows\system32\s1252929114h.dat
Deletes c:\docume~1\user\locals~1\temp\nsj42.tmp
Deletes c:\docume~1\user\locals~1\temp\nso44.tmp
Creates c:\docume~1\user\locals~1\temp\nso44.tmp\System.dll
Creates c:\docume~1\user\locals~1\temp\175.exe
Deletes c:\docume~1\user\locals~1\temp\175.exe
create folder C:\Program Files\Internet Explore
create folder C:\Program Files\Internet Explorer\IETimbe
Deletes c:\docume~1\user\locals~1\temp\nsl49.tmp

Website Activity

One or more files with the name L.EXE interacts with the following web sites and pages. Web addresses have been deliberately modified to prevent unintentional use.

nod32 .down .youkill .cn / xz / / user / setup1045 .txt
nod32 .down .youkill .cn / xz / / update .txt
nod32 .down .youkill .cn / xz / count / count .asp?mac=00-1D-92-27-59-C6&ver=2009091412&user=setup1045&md5=f49c804930fdf3a3387c673d3b756eb3&pc=DC9-JRWOG637
kaba .34433 .
Port 80 IP:60.191.129.150
Port 80 IP:60.191.129.149

Help the Webroot Community to fight cyber crime

We are always looking for ways to improve the quality and speed of research to help us protect you from malicious software and cyber crime.

The filename referred to in this report is often associated with PC infections. If you have a program of this name on your PC and would like to help our research please tell us what you know in the form below:

I have this file on my PC and believe it is an infection
I have this file on my PC and think it has made my PC slower
My firewall asked if I wanted to let this file have access to the Internet
My PC will not work since I noticed this file on it
My antivirus detected this file but won't remove it
I know what this file is and believe it is a Safe program
I am the author of this file and would like to discuss how to have it reclassified as safe

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L.EXE

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