ALIASES:

Virus:Win32/Span.A (Microsoft); W32/Span.a (McAfee); Downloader (Symantec); Virus.Win32.Selfish.h (Kaspersky); Virus.Win32.Span.a (v) (Sunbelt); Win32.Span.A (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: 249,880 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 24 Aug 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.

Other System Modifications

This file infector deletes the following files:

  • %User Temp%\eqs1.tmp

(Note: %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.)

It adds the following registry entries:

HKEY_CLASSES_ROOT
VerViewer.Application = "VerViewer.Application"

HKEY_CLASSES_ROOT
CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85} = "VerViewer.Application"

HKEY_CLASSES_ROOT
VerViewer.Application\CLSID = "{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}"

HKEY_CLASSES_ROOT
CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\ProgID = "VerViewer.Application"

HKEY_CLASSES_ROOT
CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\InprocHandler32 = "ole32.dll"

HKEY_CLASSES_ROOT
CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\LocalServer32 = "%User Temp%\eqs1.tmp"

Dropping Routine

This file infector drops the following files:

  • %System Root%\a1756172240

(Note: %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://{BLOCKED}.218.135/count1.php
  • http://{BLOCKED}.218.135/count2.php

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_CLASSES_ROOT
    • VerViewer.Application = "VerViewer.Application"
  • In HKEY_CLASSES_ROOT
    • CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85} = "VerViewer.Application"
  • In HKEY_CLASSES_ROOT
    • VerViewer.Application\CLSID = "{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}"
  • In HKEY_CLASSES_ROOT
    • CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\ProgID = "VerViewer.Application"
  • In HKEY_CLASSES_ROOT
    • CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\InprocHandler32 = "ole32.dll"
  • In HKEY_CLASSES_ROOT
    • CLSID\{73ECDB85-C96F-11D1-9EE1-00A0C9A9FB85}\LocalServer32 = "%User Temp%\eqs1.tmp"

Step 3

Search and delete this file

[ Learn More ]
There may be some files 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 Root%\a1756172240

Step 4

Scan your computer with your Trend Micro product to clean files detected as PE_SPAN.A. 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.

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\eqs1.tmp


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