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Trojan:Win32/Tesyong.A

First posted on 06 March 2014.
Source: Microsoft

Aliases :

There are no other names known for Trojan:Win32/Tesyong.A.

Explanation :

Threat behavior Trojan:Win32/Tesyong.A is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.

Installation

Trojan:Win32/Tesyong.A copies itself to %programfiles%\microsoft temsys\hongsy.exe. The malware changes the following registry entries so that it runs each time you start your PC:

In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "HongSy"
With data: "c:\program files\microsoft temsys\hongsy.exe" The malware creates the following files on your PC:

• \kill.bat

Payload

Changes system security settings
Trojan:Win32/Tesyong.A adds itself to the list of applications that can access the Internet without being stopped by your firewall. It does this by making the following registry modification:

Adds value: "C:\Program Files\Microsoft TemSys\HongSy.exe"
With data: "c:\program files\microsoft temsys\hongsy.exe:*:enabled:hongsy"
To subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List Contacts remote host
The malware might contact a remote host at pplucks.serveblog.net using port 2698. Commonly, malware does this to:

• Report a new infection to its author
• Receive configuration or other data
• Download and run files, including updates or other malware
• Receive instructions from a remote hacker
• Upload data taken from your PC

This malware description was produced and published using automated analysis of file SHA1 9327ddf5e3243a4c719d5a82a08307ceccd81733.Symptoms

System changes

The following could indicate that you have this threat on your PC:

• You have these files:
  
  

%programfiles%\microsoft temsys\hongsy.exe
\kill.bat

• You see these entries or keys in your registry:

Sets value: "HongSy"
With data: "c:\program files\microsoft temsys\hongsy.exe"
In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run Sets value: "C:\Program Files\Microsoft TemSys\HongSy.exe"
With data: "c:\program files\microsoft temsys\hongsy.exe:*:enabled:hongsy"
In subkey: HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List

Last update 06 March 2014

 

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