Worm.Win32.Ainslot.VB_85888695db

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):

85888695db7dda79926905605b30e603.exe:1960
Reader_sl.exe:1064
wuauclt.exe:344
rundll32.exe:644
reg.exe:1320
reg.exe:1612
reg.exe:2004
reg.exe:1496
jusched.exe:1056
dumprep.exe:280
dumprep.exe:1936

File activity

The process 85888695db7dda79926905605b30e603.exe:1960 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\svchost.exe (35 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Name.exe (1814 bytes)

The process wuauclt.exe:344 makes changes in a file system.

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

%WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
%WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
%WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)

The Worm deletes the following file(s):

%WinDir%\SoftwareDistribution\DataStore\Logs\tmp.edb (0 bytes)

The process jusched.exe:1056 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\jusched.log (347 bytes)

The process dumprep.exe:280 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\WER186a.dir00\svchost.exe.hdmp (215703 bytes)

The process dumprep.exe:1936 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\WER186a.dir00\svchost.exe.mdmp (102001 bytes)

Registry activity

The process 85888695db7dda79926905605b30e603.exe:1960 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7B 10 63 C3 19 7E 8F 99 0A 6B 8D 95 02 B8 51 0D"

[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]
"Startup Key" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\Name.exe"

The process Reader_sl.exe:1064 makes changes in a system registry.

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

The process rundll32.exe:644 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "FE EB E4 FF 23 63 1B B9 20 92 E7 0E CD E7 9F 4C"

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

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

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

The process reg.exe:1320 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "69 62 8C 1E FA 72 1D 03 78 8A 0A 2F 66 F9 46 34"

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

The process reg.exe:1612 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AF A2 23 55 D6 1A 52 36 62 A2 36 42 09 23 4A 4D"

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

The process reg.exe:2004 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8D 56 5C BE 5B F8 3A 5B E7 B7 2F C7 7D 17 C5 15"

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

The process reg.exe:1496 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "4E F9 BF E7 51 44 01 58 88 E2 34 A7 C9 26 FF 49"

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]
"svchost.exe" = "%Documents and Settings%\%current user%\Local Settings\Temp\svchost.exe:*:Enabled:Windows Messanger"

The process dumprep.exe:280 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "63 03 11 C6 C6 6A 3A 83 5B 90 2D 43 B4 AD D5 B9"

The process dumprep.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" = "11 3E 87 1C DD A5 CD 9C D4 FB 3F 13 6F CE 8D D7"

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):

   85888695db7dda79926905605b30e603.exe:1960
   wuauclt.exe:344
   rundll32.exe:644
   reg.exe:1320
   reg.exe:1612
   reg.exe:2004
   reg.exe:1496
   dumprep.exe:280
   dumprep.exe:1936

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

   %Documents and Settings%\%current user%\Local Settings\Temp\svchost.exe (35 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\Name.exe (1814 bytes)
   %WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
   %WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
   %WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\jusched.log (347 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WER186a.dir00\svchost.exe.hdmp (215703 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\WER186a.dir00\svchost.exe.mdmp (102001 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Startup Key" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\Name.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