TROJ_REDOSD.SMQ

 Modified by: Sabrina Lei Sioting

 ALIASES:

TrojanDropper:Win32/Zegost.C (Microsoft); Generic Dropper!dra (McAfee); Adware.Lop (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Backdoor:W32/Bjlog.D (FSecure)

 PLATFORM:

Windows 2000, Windows, XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

196,608 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Nov 2011

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • %System Root%\{random}

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

It drops the following file(s)/component(s):

  • %Application Data%\Systems\ACDSee\Igebo.ddf%SESSIONNAME%\fupmj.cc3
  • %System%\{random}.rdb

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It creates the following folders:

  • %Application Data%\Systems
  • %Application Data%\Systems\ACDSee
  • %Application Data%\Systems\ACDSee\Igebo.ddf%SESSIONNAME%

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Comhidserv70
ImagePath = "%System%\svchost.exe -k netsvcs"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Comhidserv70\Parameters
serviceDlL = "%Application Data%\Systems\ACDSee\Igebo.ddf%SESSIONNAME%\fupmj.cc3"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_HIDSERV\
0000
Service = "HidServ"

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Comhidserv70

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Enum\Root\LEGACY_HIDSERV

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\HidServ

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.112.04

FIRST VSAPI PATTERN DATE:

22 Apr 2011

VSAPI OPR PATTERN File:

8.113.00

VSAPI OPR PATTERN Date:

23 Apr 2011

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 key

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft
    • Comhidserv70
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root
    • LEGACY_HIDSERV
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • HidServ

Step 3

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. %Application Data%\Systems

Step 4

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%\{random}.rdb

Step 5

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