Worm:W32/NetSky.Q
Summary
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.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
- Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
- Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
System Infection
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.
Email Propagation
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:
Subjects:
Delivery Error Delivery Failure Delivery Mail Delivery failure Mail Delivery System Mail System Delivery Delivered Message Error Status Failure Failed Unknown Exception Delivery Failed Deliver Mail Server Error Delivery Bot
Bodies:
Delivery Error Delivery Failure Delivery Mail Delivery failure Mail Delivery System Mail System Delivery Delivered Message Error Status Failure Failed Unknown Exception Delivery Failed Deliver Mail Server Error Delivery Bot
The attachment name is created from one of the following names:
message msg mail data
The file extension is either '.pif' or '.zip'. In case of ZIP files the filename inside the ZIP can be one of
data.eml.scr mail.eml.scr msg.eml.scr message.eml.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 https://www.microsoft.com/technet/security/bulletin/MS01-020.mspx
- Plain attachment with '.pif' or '.zip' extension
Payloads
Between 7th and 12th of April, 2004 NetSky.Q infected computers will perform a Distributed Denial-of-Service attack against the following sites:
Delivery Error Delivery Failure Delivery Mail Delivery failure Mail Delivery System Mail System Delivery Delivered Message Error Status Failure Failed Unknown Exception Delivery Failed Deliver Mail Server Error Delivery Bot
On 30th of March, 2004 NetSky.Q will make the infected computer to beep randomly between 5AM and 11AM.
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