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Worm.Win32.Ainslot.VB_ae1baa878a


Trojan.Win32.Badur.frpb (Kaspersky), Backdoor.Win32.PcClient.FD, Worm.Win32.Ainslot.VB.FD, GenericAutorunWorm.YR, WormAinslot_VariantOfZeus.YR (Lavasoft MAS)Behaviour: Trojan, Backdoor, Worm, WormAutorun

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

Summary

MD5: ae1baa878a5d19146c45da7b015108bc

SHA1: 243bfc267d8ec3b3fbb4c36200c66b63e42346de

SHA256: 3caa55231f22d6b42a7124739525ecf23ce6dbbc1e1e408a8b94a857a81155f8

SSDeep: 768:19MaFw sNtOOntNSgIptWlglmtas6z8cDhw9yTMGhHESdvVGwyXmgMR1p44m0:TvTsNthttI6lgUttU1EcvVe2T44m0

Size: 62464 bytes

File type: EXE

Platform: WIN32

Entropy: Not Packed

PEID: MicrosoftVisualC, NETexecutable, UPolyXv05_v6

Company: no certificate found

Created at: 2013-12-06 12:46:10

Summary: Worm. A program that is primarily replicating on networks or removable drives.

Dynamic Analysis

Payload

Behaviour Description
WormAutorunA 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):

WScript.exe:1748
%original file name%.exe:520
rundll32.exe:204
reg.exe:1340
reg.exe:420
reg.exe:1344
reg.exe:816
dumprep.exe:1292
dumprep.exe:376
DW20.EXE:444

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

sl.exe:1576

File activity

The process WScript.exe:1748 makes changes in the file system.


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

%Documents and Settings%\%current user%\Application Data\Sample.lnk (764 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\1.vbs (0 bytes)

The process sl.exe:1576 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\1.vbs (821 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar2.tmp (2712 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab5.tmp (54 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (408 bytes)
%Documents and Settings%\%current user%\Application Data\DataWork\sl.exe (2105 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (54 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (408 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab1.tmp (49 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar6.tmp (2712 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar4.tmp (2712 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (18 bytes)
%Documents and Settings%\%current user%\Application Data\010112.txt (10 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab3.tmp (49 bytes)

The Worm deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\Tar2.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab5.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab1.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar6.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Tar4.tmp (0 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\Cab3.tmp (0 bytes)

The process %original file name%.exe:520 makes changes in the file system.


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

%Documents and Settings%\%current user%\Application Data\Microsoft\Windows\sl.exe (23362 bytes)

The process dumprep.exe:1292 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\WER961b.dir00\svchost.exe.hdmp (226814 bytes)

The process dumprep.exe:376 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\WER961b.dir00\svchost.exe.mdmp (105843 bytes)

The process DW20.EXE:444 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\dw.log (76 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\78C7E.dmp (608449 bytes)

Registry activity

The process WScript.exe:1748 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "6F 34 D5 DB 22 4B 0E 2F 21 7E 3E B0 EA 86 AB 40"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"
"CommonVideo" = "%Documents and Settings%\All Users\Documents\My Videos"

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

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"CommonMusic" = "%Documents and Settings%\All Users\Documents\My Music"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Start Menu" = "%Documents and Settings%\All Users\Start Menu"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Start Menu" = "%Documents and Settings%\%current user%\Start Menu"
"Personal" = "%Documents and Settings%\%current user%\My Documents"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"CommonPictures" = "%Documents and Settings%\All Users\Documents\My Pictures"

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\RunOnce]
"sidebar" = "%Documents and Settings%\%current user%\Application Data\Sample.lnk"

The process sl.exe:1576 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C8 4F BB FD 59 45 70 B8 36 33 1B BE F3 2A B9 82"

[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"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Documents" = "%Documents and Settings%\All Users\Documents"

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

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

[HKCU\S]
"E" = "1"

[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"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common Desktop" = "%Documents and Settings%\All Users\Desktop"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{b98117e8-75ca-11e2-81b2-000c293708fb}]
"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\ShellNoRoam\MUICache\%WinDir%\System32]
"WScript.exe" = "Microsoft (R) Windows Based Script Host"

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

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

"IntranetName" = "1"

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

"ProxyBypass" = "1"

The process %original file name%.exe:520 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AA 1E DD F3 D7 4C EC 10 3B 5C C9 CD EA 1C CD FC"

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

The process rundll32.exe:204 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "EC 7C B1 00 D7 03 EF EF FE 89 3C EF 54 EE 44 20"

[HKCU\Software\Microsoft\Windows\ShellNoRoam\MUICache\%System%]
"svchost.exe" = "Generic Host Process for Win32 Services"

[HKLM\System\CurrentControlSet\Control\Session Manager\AppCompatibility]
"AppCompatCache" = "EF BE AD DE 60 00 00 00 00 00 00 00 00 00 00 00"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers\%System%]
"svchost.exe" = "EnableNXShowUI"

The process reg.exe:1340 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "63 4E 97 9F BA 7C B7 A6 33 80 CF 5C 77 79 59 29"

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

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" = "FF C3 9B 32 95 5C B6 C6 5E E8 D9 68 52 9B 9E 12"

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

The process reg.exe:1344 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "DF 84 3A E6 5F F5 6A 83 42 21 4D 77 70 52 75 2E"

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

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

The process reg.exe:816 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BF 6F AC BA B0 2C 47 3A A5 67 A5 35 4A 56 E5 9A"

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

The process dumprep.exe:1292 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "AB A1 9D F3 AD 85 9A 36 FF 46 BF 70 81 BC E8 5A"

The process dumprep.exe:376 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "42 B6 32 78 73 C9 8A 6C E5 42 B7 F9 4B EC EC D0"

The process DW20.EXE:444 makes changes in the system registry.


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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "CA 6F 11 91 53 F4 1F F4 51 EB FA E9 2F 1B A0 87"

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

[HKLM\System\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65452"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65452"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 12 00 00 00 01 00 00 00 00 00 00 00"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

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

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Worm deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

Network activity (URLs)

URL IP
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootseq.txt
hxxp://a26.d.akamai.net/msdownload/update/v3/static/trustedr/en/authrootstl.cab
www.download.windowsupdate.com165.254.155.26


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):

    WScript.exe:1748
    %original file name%.exe:520
    rundll32.exe:204
    reg.exe:1340
    reg.exe:420
    reg.exe:1344
    reg.exe:816
    dumprep.exe:1292
    dumprep.exe:376
    DW20.EXE:444

  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\Sample.lnk (764 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\1.vbs (821 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar2.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab5.tmp (54 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004 (408 bytes)
    %Documents and Settings%\%current user%\Application Data\DataWork\sl.exe (2105 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015 (54 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015 (408 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab1.tmp (49 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar6.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Tar4.tmp (2712 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004 (18 bytes)
    %Documents and Settings%\%current user%\Application Data\010112.txt (10 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\Cab3.tmp (49 bytes)
    %Documents and Settings%\%current user%\Application Data\Microsoft\Windows\sl.exe (23362 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\WER961b.dir00\svchost.exe.hdmp (226814 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\WER961b.dir00\svchost.exe.mdmp (105843 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\dw.log (76 bytes)
    %Documents and Settings%\%current user%\Local Settings\Temp\78C7E.dmp (608449 bytes)

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

    [HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce]
    "sidebar" = "%Documents and Settings%\%current user%\Application Data\Sample.lnk"

  5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
  6. Find and delete all copies of the worm's file together with "autorun.inf" scripts on removable drives.
  7. 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