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WORM_SOVFO.A

February 13, 2014
 ALIASES:

Trojan horse Generic34.BXEX (AVG) ,W32/Trojan2.NZWV (exact) (Fprot) ,Win32.Virtob (Ikarus) ,Trojan.Win32.Cosmu.cdqg (Kaspersky) ,Worm:Win32/Sovfo.A (Microsoft) ,Win32/VB.OIB worm (Eset) ,Trj/dtcontx.G (Panda)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware, Via physical/removable drives

This worm arrives via removable drives. It 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:

198,400 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Feb 2014

Payload:

Connects to URLs/IPs, Steals information, Encrypts files

Arrival Details

This worm arrives via removable drives.

It 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 worm drops the following copies of itself into the affected system:

  • {Drive Letter}\Hot fotos.exe
  • {Drive Letter}\My Musik(2013).exe
  • %User Profile%\{random}.exe

(Note: %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.)

Autostart Technique

This worm drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{random}.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other System Modifications

This worm adds the following registry entries:

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

Backdoor Routine

This worm posts the following information to its command and control (C&C) server:

  • Encrypted Files
  • UserName
  • Machine Name
  • Date and Time of Infection

Stolen Information

This worm sends the gathered information via HTTP POST to the following URL:

  • http://www.{BLOCKED}ronproject.site11.com/post.php

NOTES:

This worm encrypts files with the following extension:

  • accda
  • accdb
  • accdc
  • accde
  • accdp
  • accdr
  • accdt
  • accdu
  • acl
  • ade
  • adp
  • asd
  • cnv
  • doc
  • docm
  • docx
  • dot
  • dotm
  • dotx
  • grv
  • iaf
  • laccdb
  • maf
  • mam
  • maq
  • mar
  • mat
  • mda
  • mdb
  • mde
  • mdt
  • mdw
  • mpd
  • mpp
  • mpt
  • oab
  • obi
  • oft
  • olm
  • one
  • onepkg
  • ops
  • ost
  • pa
  • pip
  • pot
  • potm
  • potx
  • ppa
  • ppam
  • pps
  • ppsm
  • ppsx
  • ppt
  • pptm
  • pptx
  • prf
  • pst
  • pub
  • puz
  • rpmsg
  • sldm
  • sldx
  • slk
  • snp
  • svd
  • thmx
  • vdx
  • vsd
  • vss
  • vst
  • vsx
  • vtx
  • wbk
  • wll
  • xar
  • xl
  • xla
  • xlam
  • xlb
  • xlc
  • xll
  • xlm
  • xls
  • xlsb
  • xlsm
  • xlsx
  • xlt
  • xltm
  • xltx
  • xlw
  • xsf
  • xsn

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.600.01

FIRST VSAPI PATTERN DATE:

11 Feb 2014

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

Identify and terminate files detected as WORM_SOVFO.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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
    • WarnOnZoneCrossing = "0"

Step 4

Search and delete these files

[ 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.  
  • %User Startup%\{random}.lnk

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_SOVFO.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.


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