Worm.Win32.Ainslot.VB_7fb9266324

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:420
reg.exe:528
reg.exe:948
reg.exe:1836
csc.exe:840
cvtres.exe:860

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

opera_mini3.exe:1772
%original file name%.exe:1268

File activity

The process opera_mini3.exe:1772 makes changes in the file system.

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

%Documents and Settings%\%current user%\Application Data\data.dat (34 bytes)
%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe (12 bytes)

The process csc.exe:840 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\CSC1.tmp (652 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.dll (4132 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.out (396 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\CSC1.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\RES2.tmp (0 bytes)

The process %original file name%.exe:1268 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\p9wjdxzg.out (305 bytes)
%Documents and Settings%\%current user%\Start Menu\Programs\Startup\%original file name%.exe (4185 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.cmdline (238 bytes)
%Documents and Settings%\%current user%\Application Data\opera_mini3.exe (12 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.0.cs (196 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.out (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.0.cs (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.dll (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.cmdline (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.err (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.tmp (0 bytes)

The process cvtres.exe:860 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\RES2.tmp (2912 bytes)

Registry activity

The process opera_mini3.exe:1772 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "82 2C 60 4C 18 2F F7 F8 78 20 97 BC C8 67 35 39"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"8D7SW4OD5V" = "December 23, 2013"

[HKCU\Software\VB and VBA Program Settings\SrvID\ID]
"8D7SW4OD5V" = "FraudBot"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run]
"OperaMini" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.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]
"OperaMini" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"OperaMini" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe"

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

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "B4 7B 21 44 1E 02 B8 BA E2 3B FA 3B 64 AA 6D 87"

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

The process reg.exe:528 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "DD 8C 97 52 FB CD 48 DB 6D 59 54 81 2C D9 94 86"

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]
"opera_mini3.exe" = "%Documents and Settings%\%current user%\Application Data\opera_mini3.exe:*:Enabled:Windows Messanger"

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

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "55 65 66 1E C7 6D D2 C5 3B 81 00 F0 70 E6 66 AE"

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

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

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5E 95 CE E4 2B B9 25 38 1D 3E 62 30 3F 16 E7 4A"

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]
"LWS41PCR0I.exe" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe:*:Enabled:Windows Messanger"

The process csc.exe:840 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "13 53 E9 06 23 86 71 41 C3 7E 58 C0 7D F2 3A 7B"

The process %original file name%.exe:1268 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5D CA 0C 07 F7 61 64 AE 05 F9 09 6A EA A9 EE D2"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"
"Startup" = "%Documents and Settings%\%current user%\Start Menu\Programs\Startup"
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

The process cvtres.exe:860 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8D BC 56 BD 62 BF 38 F7 FC 61 BA E6 B5 00 5F 20"

Network activity (URLs)

No activity has been detected.

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:420
   reg.exe:528
   reg.exe:948
   reg.exe:1836
   csc.exe:840
   cvtres.exe:860

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\data.dat (34 bytes)
   %Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe (12 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\CSC1.tmp (652 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.dll (4132 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.out (396 bytes)
   %Documents and Settings%\%current user%\Start Menu\Programs\Startup\%original file name%.exe (4185 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.cmdline (238 bytes)
   %Documents and Settings%\%current user%\Application Data\opera_mini3.exe (12 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\p9wjdxzg.0.cs (196 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\RES2.tmp (2912 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "OperaMini" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.exe"
   
   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "OperaMini" = "%Documents and Settings%\%current user%\Application Data\LWS41PCR0I.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