Encyclopedia entry
Updated:
Sep 06, 2011
| Published:
Sep 06, 2011
Aliases
Not available
Alert Level
(?)
Severe
Antimalware protection details
Microsoft recommends that you download the
latest definitions
to get protected.
Detection last updated:
Definition: 1.143.79.0
Released: Jan 16, 2013
|
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Detection initially created:
Definition: 1.111.1045.0
Released: Aug 30, 2011
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Summary
Backdoor:Win32/Nosrawec.C is a trojan that allows unauthorized access and control of an affected computer.
Symptoms
System changes
The following system changes may indicate the presence of this malware:
- The presence of the following files:
<current folder>\run.bat
<system folder>\pitbulll.dll
- The presence of the following registry modifications:
Adds value: "svchost.exe"
With data: "<malware file>.exe"
To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Technical Information (Analysis)
Backdoor:Win32/Nosrawec.C is a trojan that allows unauthorized access and control of an affected computer.
Installation
Backdoor:Win32/Nosrawec.C
modifies the following registry entries to ensure that its copy executes at each Windows start:
Adds value: "svchost.exe"
With data: "<malware file>.exe"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run
The malware creates the following files on an affected computer:
Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.
Payload
Allows backdoor access and control
Backdoor:Win32/Nosrawec.C allows unauthorized access and control of an affected computer. An attacker can perform any number of different actions on an affected computer using Backdoor:Win32/Nosrawec.C. This could include, but is not limited to, the following actions:
- Download and execute arbitrary files
- Upload files
- Spread to other computers using various methods of propagation
- Log keystrokes or steal sensitive data
- Modify system settings
- Run or terminate applications
- Delete files
This malware description was produced and published using our automated analysis system's examination of file SHA1 e74db8212aad1e31d1aeafe26a6ae89c9f07fb51.
Prevention
Recovery
To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following:
For more information about using antivirus software, see
http://www.microsoft.com/windows/antivirus-partners/.
