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PE_SALITY.AK

July 25, 2013
 ALIASES:

Virus:Win32/Sality.L (Microsoft); W32/Sality.t (McAfee); W32.Sality.R (Symantec); Virus.Win32.Sality.o, Virus.Win32.Sality.o (Kaspersky); Virus.Win32.Sality.r (v) (Sunbelt); Win32.Sality.I (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

393,216 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 May 2012

Arrival Details

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This file infector creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\{D4A5C023-6774-4F52-88AB-4883C43E16D7}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This file infector adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"

Dropping Routine

This file infector drops the following files:

  • %System%\wdmfmc32.dl_
  • %System Root%\KUKU300a

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This file infector connects to the following possibly malicious URL:

  • http://ruswinter.{BLOCKED}2.ru/?id38406uhugy64511
  • http://www.{BLOCKED}ustnet.com/?id38406uhugy64511
  • http://www.{BLOCKED}ustnet.info/?id38406uhugy64511
  • http://www.{BLOCKED}ustednet7.info/?id38406uhugy64511
  • http://www.{BLOCKED}ustnet7.info/?id38406uhugy64511

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • GlobalUserOffline = "0"

Step 3

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System%\wdmfmc32.dl_
  • %System Root%\KUKU300a

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Temp%\{D4A5C023-6774-4F52-88AB-4883C43E16D7}

Step 5

Scan your computer with your Trend Micro product to clean files detected as PE_SALITY.AK. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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