MD5: 9112c49fc661b8fd05629d23a740b413
SHA1: c9891e5828378d651145740c05677e4b622193e3
SHA256: 9f0a36c029400ddb8fa61ba236797188cc88cbfe8eafffb60edf34cda7bd1611
SSDeep: 3072:WmoFLmcsHpb8EUCam9cv5XMYsxqVHryGDy:uLZsHzaXBcYsxqdry
Size: 264192 bytes
File type: PE32
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualC; Armadillov171; MicrosoftVisualCv50v60MFC; MicrosoftVisualC50; UPolyXv05_v6
Company: no certificate found
Created at: 2005-05-26 04:07:58

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):

9112c49fc661b8fd05629d23a740b413.exe:2672
Lnwiwt.exe:2880

The Trojan injects its code into the following process(es):

ctfmon.exe:252

File activity

The process 9112c49fc661b8fd05629d23a740b413.exe:2672 makes changes in a file system.
The Trojan creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Lnwiwt.exe (1425 bytes)

Registry activity

The process ctfmon.exe:252 makes changes in a system registry.
The Trojan deletes the following value(s) in system registry:
The Trojan disables automatic startup of the application by deleting the following autorun value:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"internat.exe"

The process 9112c49fc661b8fd05629d23a740b413.exe:2672 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "83 0F 84 27 98 73 BE 6B 1C 61 16 F5 F9 52 2D 47"

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

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

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

The process Lnwiwt.exe:2880 makes changes in a system registry.
The Trojan creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CC 93 DA A8 30 E9 69 F0 98 AD 67 3E 1F 23 4A A7"

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

Network activity (URLs)

No activity has been detected.

Rootkit activity

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

URLDownloadToFileA
URLDownloadToFileW

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

InternetWriteFile
HttpSendRequestA
HttpSendRequestW

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
ZwQueryDirectoryFile
ZwEnumerateValueKey

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):
   

   9112c49fc661b8fd05629d23a740b413.exe:2672
   Lnwiwt.exe:2880
   

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\Lnwiwt.exe (1425 bytes)

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

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