Worm.Win32.Ainslot.VB_d74beea5ac

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:1600
reg.exe:1784
reg.exe:1728
reg.exe:1624
d74beea5ac661a4782988fccc1e17906.exe:1644

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

vbc.exe:2004

File activity

The process vbc.exe:2004 makes changes in a file system.

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

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

The process d74beea5ac661a4782988fccc1e17906.exe:1644 makes changes in a file system.

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

%Documents and Settings%\%current user%\Application Data\1pix4yja\lakwvm3x.exe (307 bytes)

Registry activity

The process vbc.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" = "54 0A F3 74 A4 AA E4 63 0A 0A EB F3 06 47 95 D2"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"NFZPJDI5GD" = "September 12, 2013"

[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]
"NFZPJDI5GD" = "Protection"

The process reg.exe:1600 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "1B B0 5F 00 84 B9 95 8A 99 02 E2 78 B1 60 A9 8C"

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

The process reg.exe:1784 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B5 F0 21 B2 67 0A B1 D8 77 D4 8B A5 A3 9C 35 92"

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:1728 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CD 75 89 DA 02 52 FB B4 7C A2 85 45 60 76 E7 5D"

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

The process reg.exe:1624 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 C3 95 C6 34 EA 95 2C 04 FD 03 DF 61 5B 7E 3C"

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

The process d74beea5ac661a4782988fccc1e17906.exe:1644 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6F F1 E9 8C ED 0B 73 CC 9C 6E 85 0E 81 EE 1C 69"

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{09414684-ea65-44b7-856a3c780f8}]
"StubPath" = "%Documents and Settings%\%current user%\Application Data\\lakwvm3x.exe"

[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]
"hls0wexjhw03xjqzhwtnpu2l" = "%Documents and Settings%\%current user%\Application Data\\lakwvm3x.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"h2d3pfep3zrx25s5rlosya4o" = "%Documents and Settings%\%current user%\Application Data\\lakwvm3x.exe"

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):

   reg.exe:1600
   reg.exe:1784
   reg.exe:1728
   reg.exe:1624
   d74beea5ac661a4782988fccc1e17906.exe:1644

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\loot (33 bytes)
   %Documents and Settings%\%current user%\Application Data\1pix4yja\lakwvm3x.exe (307 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "hls0wexjhw03xjqzhwtnpu2l" = "%Documents and Settings%\%current user%\Application Data\\lakwvm3x.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "h2d3pfep3zrx25s5rlosya4o" = "%Documents and Settings%\%current user%\Application Data\\lakwvm3x.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