Summary
Backdoor:W32/Agent.CTH is a backdoor that can steal information. Stolen information is sent to a collection site using an HTTP POST command.
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
Upon execution, this malware drops the following files:
- %windir%\system32\aspimgr.exe
- %windir%\s32.txt
- %windir%\ws386.ini
The files s32.txt and ws386.ini are logs.As part of its autostart mechanism, it installs itself as a system service.
- HKLM\SYSTEM\ControlSet001\Services\aspimgr\ ImagePath = 'C:\WINDOWS\System32\aspimgr.exe'
- HKLM\SYSTEM\ControlSet001\Services\aspimgr\ DisplayName = 'Microsoft ASPI Manager'
It also creates the following registry entry:
- HKLM\SOFTWARE\Microsoft\Sft\ {5BB68E6F-37D5-468A-992B-F34CD2A191EA}
It checks for Internet connectivity by attempting to connect to the following sites:
- www.yahoo.com
- www.web.de
This malware can steal information such as:
- Cute FTP client username/passwords
- Inetcomm server username/passwords
- IPswitch WS_FTP client username/passwords
- Outlook account username/passwords
- Protected storage username/passwords
- The Bat! username/passwords
Stolen information is sent to a collection site using an HTTP POST command.It also collects email addresses but ignores addresses with the following strings:
- abuse
- accoun
- admin
- anyone
- apache.org
- arachnoid
- -bugs
- ca.com
- caube
- cauce
- cauce.org
- certific
- -certs
- ci.el-paso.tx.us
- cloudmark.com
- digsigtrust
- e-trust
- example
- fraud
- gold-certs
- ht.ht
- icrosof
- linux
- listserv
- mailwasher
- majordomo
- messagelabs
- mydomai
- nobody
- nodomai
- noone
- nothing
- paulgraham.com
- phishing
- postmaster
- privacy
- rating
- rx.t-online
- samples
- secur
- service
- somebody
- someone
- submit
- support
- symantec
- thawte
- the.bat
- valicert
- verisign
- verisign.com
- webmaster
- webroot.com
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