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TrojanDropper:Win32/Plimrost.A


First posted on 17 July 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDropper:Win32/Plimrost.A.

Explanation :

Threat behavior

Installation
This threat can create files on your PC, including:

  • c:\users\administrator\appdata\roaming\microsoft\windows\start menu\programs\startup\p6bixtkrzh.lnk
  • c:\users\administrator\appdata\roaming\msillzcwxb\fsrq1vb72t.exe


The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.



Payload


Installs malware or unwanted software

This trojan can install other malware or unwanted software onto your PC. We have seen it inject TrojanSpy:Win32/Plimrost.B and HackTool:Win32/BrowserPassview into the running process "svchost.exe" without creating or dropping the malware onto the local drive.



Connects to a remote host

We have seen this threat connect to a remote host, including:
  • a.config.skype.com using port 53
  • b.config.skype.com using port 53
  • charles.hostzi.com using port 53
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Download and run files (including updates or other malware)
  • Report a new infection to its author
  • Receive configuration or other data
  • Receive instructions from a malicious hacker
  • Search for your PC location
  • Upload information taken from your PC
  • Validate a digital certificate


Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
  • IESQMMUTEX_0_208


It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 0867ba03eae69149218b7165816fa4bc5531c303.

Symptoms

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

  • You see a file similar to:
    • c:\users\administrator\appdata\roaming\microsoft\windows\start menu\programs\startup\p6bixtkrzh.lnk
    • c:\users\administrator\appdata\roaming\msillzcwxb\fsrq1vb72t.exe
  • You see the following mutex:
    • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}
    • IESQMMUTEX_0_208

Last update 17 July 2015

 

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