Worm.Win32.Ainslot.VB_a8e87a97d5

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):

a8e87a97d578d58e4879770c988841db.exe:596
reg.exe:2024
reg.exe:1792
reg.exe:576
reg.exe:2004

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

a8e87a97d578d58e4879770c988841db.exe:1456

File activity

The process a8e87a97d578d58e4879770c988841db.exe:1456 makes changes in a file system.

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

%Documents and Settings%\%current user%\Application Data\k-one (32 bytes)
%Documents and Settings%\%current user%\Application Data\bot.exe (689 bytes)

Registry activity

The process a8e87a97d578d58e4879770c988841db.exe:1456 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "FF A8 0A 81 85 99 9F AD 5F 11 5D 75 3F A6 03 F4"

[HKCU\Software\Microsoft\Active Setup\Installed Components\{FCC7A5E0-ABD7-659B-EC78-4ABDEA2EFB7C}]
"StubPath" = "%Documents and Settings%\%current user%\Application Data\bot.exe"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"OQ5R2IF9S3" = "September 6, 2013"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run]
"system32" = "%Documents and Settings%\%current user%\Application Data\bot.exe"

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"OQ5R2IF9S3" = "K-ONE"

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

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{FCC7A5E0-ABD7-659B-EC78-4ABDEA2EFB7C}]
"StubPath" = "%Documents and Settings%\%current user%\Application Data\bot.exe"

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]
"system32" = "%Documents and Settings%\%current user%\Application Data\bot.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"system32" = "%Documents and Settings%\%current user%\Application Data\bot.exe"

The process reg.exe:2024 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 EB D7 99 AB D0 DA BC 74 0F F7 D7 3A D6 15 D2"

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

The process reg.exe:1792 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "97 47 6E 68 20 5E BF 68 AF FB F5 14 10 E2 DF 0D"

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

The process reg.exe:576 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "80 04 90 50 B3 7F 6F 9D 05 E8 F0 12 D2 8E 13 9C"

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

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" = "39 0E 6B 1B 7B 14 27 E7 59 49 61 26 BC 99 D2 07"

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

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\c:]
"a8e87a97d578d58e4879770c988841db.exe" = "c:\a8e87a97d578d58e4879770c988841db.exe:*:Enabled:Windows Messanger"

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):

   a8e87a97d578d58e4879770c988841db.exe:596
   reg.exe:2024
   reg.exe:1792
   reg.exe:576
   reg.exe:2004

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\k-one (32 bytes)
   %Documents and Settings%\%current user%\Application Data\bot.exe (689 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "system32" = "%Documents and Settings%\%current user%\Application Data\bot.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "system32" = "%Documents and Settings%\%current user%\Application Data\bot.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