Worm.Win32.Ainslot.VB_ff5183e3ba

Dynamic Analysis

Payload

Behaviour	Description
WormAutorun	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.

Process activity

The Worm creates the following process(es):

ff5183e3baef0551f003459b811b2249.exe:548
reg.exe:420
reg.exe:528
reg.exe:948
reg.exe:1836

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

vbc.exe:1060

File activity

The process ff5183e3baef0551f003459b811b2249.exe:548 makes changes in a file system.

The Worm creates and/or writes to the following file(s):

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

The process vbc.exe:1060 makes changes in a file system.

The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\Sert.exe (3860 bytes)
%Documents and Settings%\%current user%\Application Data\DAVID (32 bytes)

Registry activity

The process ff5183e3baef0551f003459b811b2249.exe:548 makes changes in a system registry.

The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "88 93 62 C5 D4 B7 56 A3 64 D8 C5 D0 64 A0 A5 F9"

[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]
"fVjtcc" = "%Documents and Settings%\%current user%\Application Data\Prox\uhIeqG.exe"

The process reg.exe:420 makes changes in a system registry.

The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A9 0D 65 FB EA BB 5B 9A 14 4E 45 49 14 8F 1C 2C"

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

The process reg.exe:528 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 03 94 9B F2 37 AB 53 FB DB 5A C6 FF 83 77 96"

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

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\C:\Windows\Microsoft.NET\Framework\v2.0.50727]
"vbc.exe" = "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe:*:Enabled:Windows Messanger"

The process reg.exe:948 makes changes in a system registry.

The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2C 99 0F 02 79 38 8A 6A D5 D2 6F DF 04 4E 19 25"

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

The process reg.exe:1836 makes changes in a system registry.

The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B3 79 F3 FD A5 43 90 07 84 E9 5D 90 D8 83 18 80"

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]
"Sert.exe" = "%Documents and Settings%\%current user%\Application Data\Sert.exe:*:Enabled:Windows Messanger"

The process vbc.exe:1060 makes changes in a system registry.

The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "2C 54 D7 D9 EE 67 C5 5A E5 C4 79 9B 9C 51 D6 CF"

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

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"5XUDCBQUYW" = "N E O"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"5XUDCBQUYW" = "August 8, 2013"

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.

Removals

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):

   ff5183e3baef0551f003459b811b2249.exe:548
   reg.exe:420
   reg.exe:528
   reg.exe:948
   reg.exe:1836
   

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\Prox\uhIeqG.exe (1425 bytes)
   %Documents and Settings%\%current user%\Application Data\Sert.exe (3860 bytes)
   %Documents and Settings%\%current user%\Application Data\DAVID (32 bytes)

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

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

Static Analysis

Network Activity

Map

Strings from Dumps