Worm.Win32.Ainslot.VB_83e90fd13d

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:1744
reg.exe:1824
reg.exe:424
reg.exe:1860
%original file name%.exe:892
%original file name%.exe:1924

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

%original file name%.exe:1976

File activity

The process %original file name%.exe:1924 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\dum1.tmp (745 bytes)

Registry activity

The process reg.exe:1744 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "D2 D0 31 13 32 AD C2 57 5E BD 55 25 B9 1B FD 6A"

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

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

The process reg.exe:1824 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "14 DC 0F 93 42 15 3D B9 F7 6E 5F 00 83 80 49 92"

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

The process reg.exe:424 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "F3 2B BC BE D0 E6 7F 70 FA 25 35 41 CA 90 00 F9"

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

The process reg.exe:1860 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "32 CD CF 6F 97 63 EE 62 66 0D B1 D7 1E BC 0E 3A"

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

The process %original file name%.exe:1976 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "67 A1 70 4F 9F 75 4F A6 7A 66 9F 4D 2E F4 A8 D4"

[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]
"MQRH4C7SO0" = "Marktbot"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"MQRH4C7SO0" = "December 3, 2013"

The process %original file name%.exe:1924 makes changes in the system registry.

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

[HKCU\Software\Microsoft]
"Melt" = "FALSE"
"Time" = "3"
"Persist" = "FALSE"

"Format" = "Seconds"

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]
"Strings" = "%System%\IMJDC01.exe"

"IMJDC1" = "Strings"

"IMJDC0" = "c:\%original file name%.exe"

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:1744
   reg.exe:1824
   reg.exe:424
   reg.exe:1860
   %original file name%.exe:892
   %original file name%.exe:1924

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\dum1.tmp (745 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Strings" = "%System%\IMJDC01.exe"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "IMJDC1" = "Strings"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "IMJDC0" = "c:\%original file 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