Worm.Win32.Ainslot.VB_5b7007b78b

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):

reg.exe:1560
reg.exe:524
reg.exe:1500
reg.exe:1720

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

%original file name%.exe:820
vbc.exe:556

File activity

The process %original file name%.exe:820 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\Win Update\Win Update.exe (2321 bytes)

The process vbc.exe:556 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\sambuk (33 bytes)

Registry activity

The process %original file name%.exe:820 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C7 A7 B6 22 6D DF 8F 59 3A 15 8A 9E 05 93 20 A4"

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

"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]
"Win Update" = "%Documents and Settings%\%current user%\Local Settings\Temp\Win Update\Win Update.exe"

The process vbc.exe:556 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "0A 3F 53 40 16 89 2D 93 F2 7F 70 B5 5B 5B 7A E5"

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"VFQ6GPGRFF" = "Alloys"

[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]
"VFQ6GPGRFF" = "February 25, 2014"

The process reg.exe:1560 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BD 4A F9 2E BE F0 73 79 B0 69 F2 66 D0 22 01 69"

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

The process reg.exe:524 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F5 DF 24 FD 1B 43 CE FD E3 8A D8 A8 97 9A 26 C6"

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

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

The process reg.exe:1500 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "1D 44 6C D9 59 C4 89 49 3B 22 B7 BC A3 B3 5F F1"

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]
"SCY3YS9T9J.exe" = "%Documents and Settings%\%current user%\Application Data\SCY3YS9T9J.exe:*:Enabled:Windows Messanger"

The process reg.exe:1720 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "08 5D C1 FD 4C 55 88 98 BE 06 5C C7 BB 2D A2 66"

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

Network activity (URLs)

URL	IP
hxxp://api.ipinfodb.com/v2/ip_query_country.php?key=33134207068e7a95c2b45275a388806be6b9ca837fe782832723b99fb21a7a8c&timezone=off	192.187.109.60
sambuckers.zapto.org	213.120.39.131

HOSTS file anomalies

No changes have 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):

   reg.exe:1560
   reg.exe:524
   reg.exe:1500
   reg.exe:1720

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\Win Update\Win Update.exe (2321 bytes)
   %Documents and Settings%\%current user%\Application Data\sambuk (33 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Win Update" = "%Documents and Settings%\%current user%\Local Settings\Temp\Win Update\Win Update.exe"

5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
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.

Static Analysis

Network Activity

Map

Strings from Dumps