MD5: b9d16fd7bdebb3dad6ec8ae5d9e3eeae
SHA1: 4bbc4e78e45f98f564b5bec7c9977e19671ca8f2
SHA256: dd0f4312e96b2ac7c2958966e4e6533550bfd3e2f06eb38c450fba8e6dcf3118
SSDeep: 6144:6LidyodFogXt3Y/VEXmtozuTqU5z1TKbdTVDu17Bi83zehr4NTz:P4op6UUtzRp7i KRS
Size: 274432 bytes
File type: PE32
Platform: WIN32
Entropy: Not Packed
PEID: MicrosoftVisualC; UPolyXv05_v6; NETexecutable
Company: no certificate found
Created at: 2012-01-25 05:47:28

Summary:

Worm. A program that is primarily replicating on networks or removable drives.

Payload

Process activity

The Worm creates the following process(es):

rundll32.exe:1268
reg.exe:1768
reg.exe:1508
reg.exe:1692
reg.exe:1936
b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe:468
dumprep.exe:1676
dumprep.exe:816

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

msconfig.exe:376

File activity

The process msconfig.exe:376 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\N7NWFLK59S.exe (35 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\appcompat.txt (1889 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\manifest.txt (7108 bytes)

The process b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe:468 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\msconfig.exe (35 bytes)

The process dumprep.exe:1676 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\msconfig.exe.hdmp (212696 bytes)

The process dumprep.exe:816 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\msconfig.exe.mdmp (102325 bytes)

Registry activity

The process msconfig.exe:376 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3C F7 6A 80 69 36 D8 C2 74 2D FB 0D 0B DD F2 4C"

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"4OF346SSP5" = "Fucku"

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

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"4OF346SSP5" = "July 13, 2013"

The Worm deletes the following registry key(s):

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]

The Worm deletes the following value(s) in system registry:

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]
"DWFileTreeRoot"

The process rundll32.exe:1268 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "29 E2 24 94 34 66 F0 17 0F 50 30 F9 D6 C9 5B 89"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers\%Documents and Settings%\%current user%\Local Settings\Temp]
"msconfig.exe" = "EnableNXShowUI"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Documents and Settings%\%current user%\Local Settings\Temp]
"msconfig.exe" = "Microsoft® Resource File To COFF Object Conversion Utility"

[HKLM\System\CurrentControlSet\Control\Session Manager\AppCompatibility]
"AppCompatCache" = "EF BE AD DE 60 00 00 00 00 00 00 00 00 00 00 00"

The process reg.exe:1768 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "21 A8 5D 1F 87 AB 1B 1A 12 C0 6B DA F4 C7 CF FA"

Adds a rule to the firewall Windows which allows any network activity:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Documents and Settings%\%current user%\Application Data]
"N7NWFLK59S.exe" = "%Documents and Settings%\%current user%\Application Data\N7NWFLK59S.exe:*:Enabled:Windows Messanger"

The process reg.exe:1508 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BA D0 88 55 F4 C1 1F 17 80 0F B7 35 BC C8 77 03"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DoNotAllowExceptions" = "0"

The process reg.exe:1692 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "49 60 DB EE 43 46 81 B0 EB 3F B6 4A D9 25 3D 1F"

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DoNotAllowExceptions" = "0"

The process reg.exe:1936 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "EF 47 E0 CE FA AF 1B 4F 45 04 56 8F F7 5F DA 55"

Adds a rule to the firewall Windows which allows any network activity:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\%Documents and Settings%\%current user%\Local Settings\Temp]
"msconfig.exe" = "%Documents and Settings%\%current user%\Local Settings\Temp\msconfig.exe:*:Enabled:Windows Messanger"

The process b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe:468 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "13 85 0F FD 85 00 C6 BB 7D D2 BB 5F 99 C1 84 D6"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Communication Services" = "c:\b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe"

The process dumprep.exe:1676 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CF BD 26 7F 21 24 CA ED C7 06 81 99 40 49 A7 37"

The process dumprep.exe:816 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7E 04 A6 CE D0 F4 4D 1B 6F 36 EA A0 04 F2 5D 23"

Network activity (URLs)

No activity has been detected.

Rootkit activity

No anomalies have been detected.

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 Worm's file once a user opens a drive's folder in Windows Explorer.

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. Terminate malicious process(es) (How to End a Process With the Task Manager):
   

   rundll32.exe:1268
   reg.exe:1768
   reg.exe:1508
   reg.exe:1692
   reg.exe:1936
   b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe:468
   dumprep.exe:1676
   dumprep.exe:816

2. Delete the original Worm file.
   
3. Delete or disinfect the following files created/modified by the Worm:
   

   %Documents and Settings%\%current user%\Application Data\N7NWFLK59S.exe (35 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\appcompat.txt (1889 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\manifest.txt (7108 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\msconfig.exe (35 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\msconfig.exe.hdmp (212696 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WERcbc8.dir00\msconfig.exe.mdmp (102325 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Communication Services" = "c:\b9d16fd7bdebb3dad6ec8ae5d9e3eeae.exe"

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

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