Virus.Win32.Sality_541c0c2ac1

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 Virus's file once a user opens a drive's folder in Windows Explorer.
IRCBot	A bot can communicate with command and control servers via IRC channel.
MSNWorm	A worm can spread its copies through the MSN Messanger.
DNSBlocker	A program can block designated DNS servers for making it difficult for users to locate specific domains or web sites on the Internet.
UDPFlooder	This program can make a UDP flood. A UDP flood attack is a denial-of-service attack using the User Datagram Protocol (UDP). It can be initiated by sending a large number of UDP packets to random ports on a remote host.
SYNFlooder	This program can make a SYN flood. It is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic.
Trojan-Proxy	This program can launch a proxy server (SOCKS4) on a designated TCP port.
USBInfector	A program can register a device notification with the help of RegisterDeviceNotification. So it is notified when a USB device is plugged and then the worm copies itself to the USB device plugged into the affected computer.

Process activity

The Virus creates the following process(es):

541c0c2ac1d5efa91db04d02894d4817.exe:47352
541c0c2ac1d5efa91db04d02894d4817.exe:47308
Reader_sl.exe:1064
wuauclt.exe:344
jusched.exe:1056

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

541c0c2ac1d5efa91db04d02894d4817.exe:1572
mspaint.exe:47364

File activity

The process 541c0c2ac1d5efa91db04d02894d4817.exe:1572 makes changes in a file system.

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

%WinDir%\system.ini (70 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\winmfsea.exe (741 bytes)
D:\disablejavawarnsec.exe (1080 bytes)
%Program Files%\Common Files\Java\Java Update\jusched.exe (856 bytes)

The Virus deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\winmfsea.exe (0 bytes)

The process 541c0c2ac1d5efa91db04d02894d4817.exe:47308 makes changes in a file system.

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

%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr (2105 bytes)
%Documents and Settings%\%current user%\Application Data\temp.bin (2105 bytes)

The process wuauclt.exe:344 makes changes in a file system.

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

%WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
%WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
%WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)

The Virus deletes the following file(s):

%WinDir%\SoftwareDistribution\DataStore\Logs\tmp.edb (0 bytes)

The process mspaint.exe:47364 makes changes in a file system.

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

%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OT6B4D2F\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\01Y1APMP\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\HJ3MYGR4\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\E1KHTW1B\desktop.ini (67 bytes)
%Documents and Settings%\%current user%\Application Data\Microsoft\Cukmko.exe (2105 bytes)

The Virus deletes the following file(s):

C:\541c0c2ac1d5efa91db04d02894d4817.exe (0 bytes)

The process jusched.exe:1056 makes changes in a file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\jusched.log (347 bytes)

Registry activity

The process 541c0c2ac1d5efa91db04d02894d4817.exe:1572 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Security Center]
"UacDisableNotify" = "1"

[HKCU\Software\Aas]
"a1_0" = "1659143114"

[HKCU\Software\Aas\695404737]
"35845605" = "489"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
"EnableLUA" = "0"

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

[HKCU\Software\Aas\695404737]
"50183847" = "49580A24078503EF3B2EAB54CE00B4CF7993656E2BFDA2944EAFC40E2D27F591AE0F79EA3D3841399E16CD9B974BCD92424A0ED318DFAFF0ECF89CF0C4DB98D3F44EA7B9032E5593D93CD973E8CB37E5565A3EE7E841D6820DDEA750251DC8CBD289022E67F0ADF81543D679009C5B5007D72D326FDA29178203458A8E9F181A"

[HKCU\Software\Aas\695404737]
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

[HKCU\Software\Aas]
"a3_0" = "17001001"

[HKLM\SOFTWARE\Microsoft\Security Center]
"AntiVirusOverride" = "1"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"UpdatesDisableNotify" = "1"

[HKLM\SOFTWARE\Microsoft\Security Center]
"FirewallOverride" = "1"

[HKCU\Software\Aas\695404737]
"14338242" = "0"

[HKCU\Software\Aas\695404737]
"7169121" = "141"

[HKCU\Software\Aas\695404737]
"21507363" = "0"

[HKCU\Software\Aas\695404737]
"28676484" = "35"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "58 43 FC 22 19 C3 88 FE 82 EA 9E 9F A0 8D 23 E1"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"UacDisableNotify" = "1"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"Hidden" = "2"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"FirewallOverride" = "1"

[HKLM\SOFTWARE\Microsoft\Security Center]
"FirewallDisableNotify" = "1"

[HKCU\Software\Aas]
"a2_0" = "7650"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"FirewallDisableNotify" = "1"

[HKLM\SOFTWARE\Microsoft\Security Center]
"UpdatesDisableNotify" = "1"

[HKCU\Software\Aas]
"a4_0" = "0"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"AntiVirusOverride" = "1"

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

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\c:]
"541c0c2ac1d5efa91db04d02894d4817.exe" = "c:\541c0c2ac1d5efa91db04d02894d4817.exe:*:Enabled:ipsec"

Firewall notifications are disabled:

[HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
"DisableNotifications" = "1"

Antivirus notifications are disabled:

[HKLM\SOFTWARE\Microsoft\Security Center]
"AntiVirusDisableNotify" = "1"

[HKLM\SOFTWARE\Microsoft\Security Center\Svc]
"AntiVirusDisableNotify" = "1"

A firewall is disabled:

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

The process 541c0c2ac1d5efa91db04d02894d4817.exe:47352 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "79 D6 85 46 62 AD 4B DE 1E 7F 8E 1E 32 3C 17 88"

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

The process 541c0c2ac1d5efa91db04d02894d4817.exe:47308 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "5A 29 E7 B1 52 09 8D 66 C1 B5 32 F7 CA 92 41 AA"

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

To automatically run itself each time Windows is booted, the Virus adds the following link to its file to the system registry autorun key:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"Screen Saver Pro 3.1" = "%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr"

The process Reader_sl.exe:1064 makes changes in a system registry.

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\{c155cd73-744b-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\{c155cd72-744b-11e2-8294-806d6172696f}]
"BaseClass" = "Drive"

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

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

The process mspaint.exe:47364 makes changes in a system registry.

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

[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\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 16 00 00 00 01 00 00 00 00 00 00 00"

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

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

[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\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

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

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

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

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "C8 7E BF 31 69 0E E8 41 33 9F 3B 29 A1 CE 4B 10"

[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"

[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\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"

The Virus 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 Virus 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"

To automatically run itself each time Windows is booted, the Virus adds the following link to its file to the system registry autorun key:

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

Proxy settings are disabled:

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

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

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

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

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

Network activity (URLs)

No activity has been detected.

Rootkit activity

The Virus installs the following user-mode hooks in WININET.dll:

HttpSendRequestW
InternetWriteFile
HttpSendRequestA

The Virus installs the following user-mode hooks in dnsapi.dll:

DnsQuery_A
DnsQuery_W

The Virus installs the following user-mode hooks in WS2_32.dll:

send
GetAddrInfoW

The Virus installs the following user-mode hooks in kernel32.dll:

MoveFileA
CopyFileW
CopyFileA
MoveFileW
CreateFileW
CreateFileA

The Virus installs the following user-mode hooks in ntdll.dll:

LdrLoadDll
NtResumeThread
NtQueryDirectoryFile
NtEnumerateValueKey

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 Virus's file once a user opens a drive's folder in Windows Explorer.A program can register a device notification with the help of RegisterDeviceNotification. So it is notified when a USB device is plugged and then the worm copies itself to the USB device plugged into the affected computer.A worm can spread its copies through the MSN Messanger.

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. Scan a system with an anti-rootkit tool.
   
2. Terminate malicious process(es) (How to End a Process With the Task Manager):

   541c0c2ac1d5efa91db04d02894d4817.exe:47352
   541c0c2ac1d5efa91db04d02894d4817.exe:47308
   wuauclt.exe:344
   

3. Delete the original Virus file.
   
4. Delete or disinfect the following files created/modified by the Virus:

   %WinDir%\system.ini (70 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\winmfsea.exe (741 bytes)
   D:\disablejavawarnsec.exe (1080 bytes)
   %Program Files%\Common Files\Java\Java Update\jusched.exe (856 bytes)
   %Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr (2105 bytes)
   %Documents and Settings%\%current user%\Application Data\temp.bin (2105 bytes)
   %WinDir%\SoftwareDistribution\DataStore\Logs\edb.chk (100 bytes)
   %WinDir%\SoftwareDistribution\DataStore\Logs\edb.log (3576 bytes)
   %WinDir%\SoftwareDistribution\DataStore\DataStore.edb (100 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\OT6B4D2F\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\01Y1APMP\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\HJ3MYGR4\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\E1KHTW1B\desktop.ini (67 bytes)
   %Documents and Settings%\%current user%\Application Data\Microsoft\Cukmko.exe (2105 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\jusched.log (347 bytes)

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

   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Screen Saver Pro 3.1" = "%Documents and Settings%\%current user%\Application Data\ScreenSaverPro.scr"
   
   [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   "Cukmko" = "%Documents and Settings%\%current user%\Application Data\Microsoft\Cukmko.exe"

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