The Netsky.Q variant was discovered on March 29th, 2004.This worm spreads in email using different exploits and social engineering. NetSky.Q performs a DDoS against several websites and makes the infected computers beep randomly.
Disinfection & Removal
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.
Eliminating a Local Network Outbreak
If the infection is in a local network, please follow the instructions on this webpage:
Upon execution the worm copies its dropper to the Windows Directory as 'SysMonXP.exe', which is added to the registry:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] = "SysMonXP" = "%WinDir%\SysMonXP.exe"
where %WinDir% represents Windows directory name.
The main DLL is placed to the same place with the filename 'firewallogger.txt' alongside with other temporary files used by the worm:
'zipo0.txt' 'zipo1.txt' 'zipo2.txt' 'zipo3.txt' 'base64.tmp' 'zippedbase64.tmp'
The worm removes several registry values that belong to other worms.
When collecting addresses NetSky.Q recursively searches through all hard drives and checks the content of files with the following extensions:
.adb .asp .cfg .cgi .dbx .dhtm .doc .eml .htm .html .jsp .mbx .mdx .mht .mmf .msg .nch .ods .oft .php .pl .ppt .rtf .sht .shtm .stm .tbb .txt .uin .vbs .wab .wsh .xls .xml
This variant of NetSky sends emails that look like error messages from mail servers.
Here's an example of what messages sent by Netsky.Q can look like:
The emails are composed from the following parts:
Delivery Error <firstname.lastname@example.org> Delivery Failure <email@example.com> Delivery <firstname.lastname@example.org> Mail Delivery failure <email@example.com> Mail Delivery System <firstname.lastname@example.org> Mail System <email@example.com> Delivery <firstname.lastname@example.org> Delivered Message <email@example.com> Error <firstname.lastname@example.org> Status <email@example.com> Failure <firstname.lastname@example.org> Failed <email@example.com> Unknown Exception <firstname.lastname@example.org> Delivery Failed <email@example.com> Deliver Mail <firstname.lastname@example.org> Server Error <email@example.com> Delivery Bot <firstname.lastname@example.org>
Mail Delivery - This mail couldn't be displayed Mail Delivery Failed - This mail couldn't be represent Mail Delivery Error - This mail contains unicode characters Mail Transaction Failed - This mail couldn't be converted Mail Delivery System - This mail contains binary characters Mail Delivery Failure - This mail couldn't be shown. Delivery Failure - Invalid mail specification Delivery Agent - Translation failed ------------- failed message ------------- The message has been sent as a binary attachment. Partial message is available and has been sent as a binary attachment. Received message has been attached. Message has been sent as a binary attachment. Translated message has been attached. Received message has been sent as an encoded attachment. Modified message has been sent as a binary attachment. Note: Received message has been sent as a binary file.
The attachment name is created from one of the following names:
message<random characters> msg<random characters> mail<random characters> data<random characters>
The file extension is either '.pif' or '.zip'. In case of ZIP files the filename inside the ZIP can be one of
data.eml<lots of spaces>.scr mail.eml<lots of spaces>.scr msg.eml<lots of spaces>.scr message.eml<lots of spaces>.scr
The purpose of large number of spaces between the extensions is to the hide the executable extension from the users' eyes, leaving them with the harmless looking '.eml' to open.
The email can contain different endings that attempt to start the attachment or make the user to do so.
- A link with the format: www.<recipient domain>/inmail/<recipient username>/mread.php?sessionid-<random>
- An exploit for MS01-020 (IFRAME) to execute the attachment automatically. More information on the vulnerability and patches are available from http://www.microsoft.com/technet/security/bulletin/MS01-020.mspx
- Plain attachment with '.pif' or '.zip' extension
Between 7th and 12th of April, 2004 NetSky.Q infected computers will perform a Distributed Denial-of-Service attack against the following sites:
www.cracks.st www.cracks.am www.emule-project.net www.kazaa.com www.edonkey2000.com
On 30th of March, 2004 NetSky.Q will make the infected computer to beep randomly between 5AM and 11AM.