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TROJ_RADMIN.AG

February 21, 2014
 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:

5,139,986 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Feb 2014

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%\7ZipSfx.000
  • %System Root%\MSI2a08c.tmp
  • %System Root%\Config.Msi
  • %Program Files%\Remote Manipulator System - Server

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This Trojan deletes the following files:

  • %Windows%\Installer\MSI9.tmp
  • %System Root%\Config.Msi\MSI13.tmp

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

It deletes the following folders:

  • %User Profile%\My Documents\My Pictures
  • %Start Menu%\Programs\Administrative Tools

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Installer\
InProgress

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Installer\
Rollback\Scripts

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
E5052F47A02BDEA469F8EAB572D83BA8

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
E45BAE6295648E74689FC47BF4E730EB

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
6364F69515D55F943B4B3F3C669ECD32

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
6EDC4423414699340B5D245426472701

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
Rollback\Scripts
%System Root%\Config.Msi\2a08e.rbs = "444a599"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
E5052F47A02BDEA469F8EAB572D83BA8
506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
E45BAE6295648E74689FC47BF4E730EB
506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
6364F69515D55F943B4B3F3C669ECD32
506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
6364F69515D55F943B4B3F3C669ECD32
00000000000000000000000000000000 = "%Program Files%\Remote Manipulator System - Server"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
UserData\S-1-5-18\Components\
6EDC4423414699340B5D245426472701
506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Installer\
Folders
%Program Files%\Remote Manipulator System - Server = "1"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\7ZipSfx.000\rms.server5.2ru.msi
  • %User Temp%\7ZipSfx.000\install.cmd
  • %Windows%\Installer\2a08b.msi
  • %Windows%\Installer\2a08d.ipi
  • %Windows%\Installer\MSIF.tmp
  • %System Root%\Config.Msi\2a08e.rbs

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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\Windows\CurrentVersion\Installer
    • InProgress
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback
    • Scripts
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components
    • E5052F47A02BDEA469F8EAB572D83BA8
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components
    • E45BAE6295648E74689FC47BF4E730EB
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components
    • 6364F69515D55F943B4B3F3C669ECD32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components
    • 6EDC4423414699340B5D245426472701

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts
    • %System Root%\Config.Msi\2a08e.rbs = "444a599"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\E5052F47A02BDEA469F8EAB572D83BA8
    • 506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\E45BAE6295648E74689FC47BF4E730EB
    • 506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\6364F69515D55F943B4B3F3C669ECD32
    • 506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\6364F69515D55F943B4B3F3C669ECD32
    • 00000000000000000000000000000000 = "%Program Files%\Remote Manipulator System - Server"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\6EDC4423414699340B5D245426472701
    • 506AA7BAF00535142870BF5536141921 = "%Program Files%\Remote Manipulator System - Server"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\Folders
    • %Program Files%\Remote Manipulator System - Server = "1"

Step 4

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.
  • %User Temp%\7ZipSfx.000\rms.server5.2ru.msi
  • %User Temp%\7ZipSfx.000\install.cmd
  • %Windows%\Installer\2a08b.msi
  • %Windows%\Installer\2a08d.ipi
  • %Windows%\Installer\MSIF.tmp
  • %System Root%\Config.Msi\2a08e.rbs

Step 5

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.
  • %User Temp%\7ZipSfx.000
  • %System Root%\MSI2a08c.tmp
  • %System Root%\Config.Msi
  • %Program Files%\Remote Manipulator System - Server

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_RADMIN.AG. 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 7

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.

  • %Windows%\Installer\MSI9.tmp
  • %System Root%\Config.Msi\MSI13.tmp


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