Worm.Win32.Ainslot.VB_97a591f718

by malwarelabrobot on July 2nd, 2013 in Malware Descriptions.

HEUR:Trojan.Win32.Generic (Kaspersky), Worm.Win32.Ainslot.VB.FD, WormAinslot_VariantOfZeus.YR, GenericAutorunWorm.YR (Lavasoft MAS)
Behaviour: Trojan, Worm, WormAutorun


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary
Technical Details
Removal Recommendations

MD5: 97a591f71812bdc908bdce86676ac6e9
SHA1: fd5b04f3ca05fe637ab8e1a0c01ac7d4a70ddd5b
SHA256: 0d5b3f6fedc364b41780d5b62c326259018e9db6bacf26b9ce6ac533b419e3c5
SSDeep: 6144:Rpca4HLxmedH18TPBsCo26ATLjtYx1oGRWDg5zHgM9Ko1H:j7Mx5H18zBsT26CG1oGvNHg9o
Size: 356352 bytes
File type: PE32
Platform: WIN32
Entropy: Packed
PEID: MicrosoftVisualC; UPolyXv05_v6; NETexecutable
Company: no certificate found
Created at: 2013-06-24 14:53:25


Summary:

Trojan. A program that appears to do one thing but actually does another (a.k.a. Trojan Horse).
WormAutorun. A worm spreads 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:296
reg.exe:312
reg.exe:304
reg.exe:1944
reg.exe:2036
97a591f71812bdc908bdce86676ac6e9.exe:832

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

cvtres.exe:508

File activity

The process 97a591f71812bdc908bdce86676ac6e9.exe:832 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\cvtres.exe (1 bytes)

The process cvtres.exe:508 makes changes in a file system.
The Worm creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Application Data\svchost.exe (1 bytes)
%Documents and Settings%\%current user%\Application Data\svchost (33 bytes)

Registry activity

The process reg.exe:296 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "A9 CB 71 2F 75 0F A5 50 93 7D 60 40 18 47 B6 25"

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%\Local Settings\Temp]
"cvtres.exe" = "%Documents and Settings%\%current user%\Local Settings\Temp\cvtres.exe:*:Enabled:Windows Messanger"

The process reg.exe:312 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "E4 C5 41 EF 78 91 18 CD B4 DF 48 AD E7 72 78 BF"

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

The process reg.exe:304 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3B 77 9E 28 C0 09 29 89 97 DD 68 91 0C B2 87 64"

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

The process reg.exe:1944 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "56 3B D6 43 B5 C0 AD 90 CB 08 5D DC F4 C6 97 20"

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]
"Windows Live" = "%Documents and Settings%\%current user%\Application Data\winini.exe"

The process reg.exe:2036 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "1A 9B CA A0 29 1C 49 ED A0 8F 29 12 DF 37 DD 87"

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

The process 97a591f71812bdc908bdce86676ac6e9.exe:832 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BC 8D AF AC A1 3E 86 1B DF 28 87 DF BC 8A A3 5C"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd75-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"BaseClass" = "Drive"

The Worm modifies IE settings for security zones to map all web-nodes that bypassing proxy to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"ProxyBypass" = "1"

The Worm modifies IE settings for security zones to map all urls to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"IntranetName" = "1"

The Worm modifies IE settings for security zones to map all local web-nodes with no dots which do not refer to any zone to the Intranet Zone:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap]
"UNCAsIntranet" = "1"

The process cvtres.exe:508 makes changes in a system registry.
The Worm creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "0E B4 B3 51 DF 16 EA 26 07 39 85 A5 63 F5 E5 2D"

[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]
"0Q0FOUWUR1" = "Albaner"

[HKCU\Software\VB and VBA Program Settings\INSTALL\DATE]
"0Q0FOUWUR1" = "July 1, 2013"

Network activity (URLs)

No activity has been detected.

Rootkit activity

No anomalies have been detected.

Propagation

A worm spreads 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.


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:296
    reg.exe:312
    reg.exe:304
    reg.exe:1944
    reg.exe:2036
    97a591f71812bdc908bdce86676ac6e9.exe:832

  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\cvtres.exe (1 bytes)
    %Documents and Settings%\%current user%\Application Data\svchost.exe (1 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
    "Windows Live" = "%Documents and Settings%\%current user%\Application Data\winini.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.