MD5: ad4e9546e394a88bc797d68090a90232
SHA1: 6b7893a6ae5ec6d6b621352087902c2cc2190af1
SHA256: 2a7fc0b45b7c22990c016741933da388b9330b9518c771f82fa2c11de5cda065
SSDeep: 12288:trOCSY3ncsDQ RO54aHtVYCW02GovvBBWnaxEympcWMDoS:trQ6RO5idrm
Size: 1628672 bytes
File type: PE32
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualBasicv50v60, UPolyXv05_v6
Company: no certificate found
Created at: 2009-07-09 03:03:28

Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).

Payload

Process activity

The Trojan creates the following process(es):

Lskmkx.exe:964
Lskmkx.exe:668
ad4e9546e394a88bc797d68090a90232.exe:1516
ad4e9546e394a88bc797d68090a90232.exe:1604

File activity

The process ad4e9546e394a88bc797d68090a90232.exe:1516 makes changes in a file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Lskmkx.exe (10177 bytes)

Registry activity

The process Lskmkx.exe:964 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8C 22 D8 BD 6C 17 E8 C1 C0 81 40 49 A0 8E 84 03"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

The process Lskmkx.exe:668 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "07 7A A5 17 7F 08 36 0E EF 16 84 C5 B8 88 16 2C"

The process ad4e9546e394a88bc797d68090a90232.exe:1516 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CF 02 25 5E A9 1E 61 70 BE CA 75 A8 53 BE 76 50"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
"Shell" = "explorer.exe,%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
"Shell" = "explorer.exe,%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

To automatically run itself each time Windows is booted, the Trojan adds the following link to its file to the system registry autorun key:

[HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run]
"Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

The process ad4e9546e394a88bc797d68090a90232.exe:1604 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A5 5B C5 2E E5 7B F0 E3 2B 2D 81 26 E5 15 28 F0"

Network activity (URLs)

No activity has been detected.

Rootkit activity

The Trojan installs the following user-mode hooks in WININET.dll:

HttpSendRequestW
InternetWriteFile
HttpSendRequestA

The Trojan installs the following user-mode hooks in WS2_32.dll:

send

The Trojan installs the following user-mode hooks in kernel32.dll:

MoveFileA
CopyFileW
CopyFileA
MoveFileW
CreateFileW
CreateFileA

The Trojan installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtResumeThread
NtQueryDirectoryFile
NtEnumerateValueKey

Propagation

A worm can spread via removable drives. It writes its executable and creates "autorun.inf" scripts on all removable drives. The autorun script will execute the Trojan's file once a user opens a drive's folder in Windows Explorer.
A program can register a device notification with the help of RegisterDeviceNotification. So it is notified when a USB device is plugged and then the worm copies itself to the USB device plugged into the affected computer.

Remove it with Ad-Aware

1. Click (here) to download and install Ad-Aware Free Antivirus.
2. Update the definition files.
3. Run a full scan of your computer.

Manual removal*

1. Scan a system with an anti-rootkit tool.
   
2. Terminate malicious process(es) (How to End a Process With the Task Manager):
   

   Lskmkx.exe:964
   Lskmkx.exe:668
   ad4e9546e394a88bc797d68090a90232.exe:1516
   ad4e9546e394a88bc797d68090a90232.exe:1604

3. Delete the original Trojan file.
   
4. Delete or disinfect the following files created/modified by the Trojan:
   

   %Documents and Settings%\%current user%\Application Data\Lskmkx.exe (10177 bytes)

5. Delete the following value(s) in the autorun key (How to Work with System Registry):
   

   [HKU\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run]
   "Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Lskmkx" = "%Documents and Settings%\%current user%\Application Data\Lskmkx.exe"

6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
   
7. Reboot the computer.
   

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.