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PWS:MSIL/Stimilini.S


First posted on 27 October 2015.
Source: Microsoft

Aliases :

There are no other names known for PWS:MSIL/Stimilini.S.

Explanation :

Threat behavior

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

  • %ProgramData%\important.exe
  • %TEMP%\file82.exe


It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run Sets value: "9a86d531e19ec6f5937ad1373bb118bd"
With data: "%ProgramData%\important.exe"

Payload


Steals your sensitive information

This threat can steal your sensitive information, such as your user names and passwords for:

  • Email or social media websites
  • Banking websites
  • Online games


Connects to a remote host

We have seen this threat connect to a remote host, including:
  • rippyinc.com using port 80
  • rippyinc.com/keybase/post.php?type=notification&machinename={computername}&machinetime={executiontime}
  • rippyinc.com/keybase/image/upload.php
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


We have seen this threat access online content, including:

  • Updater.exe


Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:

  • 927b028cfa24b23a09ff20c1a7f9b3981145a30ff80745b56fb0cecf65305017cfcd208495d565ef66e7dff9f98764da


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 8a70e689b2c52e9f37c1b47d5c37c09de57cfdeb.

Symptoms

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

  • You see a file similar to:
    • %ProgramData%\important.exe
    • %TEMP%\file82.exe
  • You see registry modifications such as:
    • In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
      Sets value: "9a86d531e19ec6f5937ad1373bb118bd"
      With data: "%ProgramData%\important.exe"

  • You see the following mutex:
    • 927b028cfa24b23a09ff20c1a7f9b3981145a30ff80745b56fb0cecf65305017cfcd208495d565ef66e7dff9f98764da

Last update 27 October 2015

 

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