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TROJ_DROPR.SMZ1

July 02, 2013
 ALIASES:

TrojanDropper:Win32/Agent (Microsoft); Trojan.ADH (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan:W32/Agent.DQGR (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:

541,256 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 May 2012

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 creates the following folders:

  • %User Temp%\ba11

(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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\yjxadfvy

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft
jvmv = "1e24"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\yjxadfvy
Start = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\yjxadfvy
Type = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tcpip
msspno = "yjxadfvy"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tcpip
clientno = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tcpip
computerid = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tcpip
serverd = "n95"

Dropping Routine

This Trojan drops the following files:

  • %System%\gins.exe
  • %System%\JeepImage.sys
  • %Windows%\msvlogon.jpg
  • %System%\drivers\yjxadfvy.sys

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

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\System\CurrentControlSet\Services
    • yjxadfvy
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • JavaSoft

Step 4

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_LOCAL_MACHINE\SOFTWARE\JavaSoft
    • jvmv = "1e24"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\yjxadfvy
    • Start = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\yjxadfvy
    • Type = "2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tcpip
    • msspno = "yjxadfvy"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tcpip
    • clientno = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tcpip
    • computerid = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tcpip
    • serverd = "n95"

Step 5

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%\gins.exe
  • %System%\JeepImage.sys
  • %Windows%\msvlogon.jpg
  • %System%\drivers\yjxadfvy.sys

Step 6

Search and delete this folder

[ 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.
  • %User Temp%\ba11

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPR.SMZ1. 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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