Analysis by: Jaime Benigno Reyes
 Modified by: Henry Alarcon Jr.

ALIASES:

RiskWare.RemoteAdmin (Malwarebytes), Application.RemoteAdmin.RHU (BitDefender), SPR/RemoteAdmin.AO (Avira)

 PLATFORM:

Windows

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

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Hacking Tool arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 1,460,224 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 28 Sep 2018
Payload: Drops files, Connects to URLs/IPs, Hides files and processes

Arrival Details

This Hacking Tool arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be dropped by the following malware:

Installation

This Hacking Tool drops the following files:

  • %Program Files%\RDP Wrapper\rdpwrap.ini
  • %Program Files%\RDP Wrapper\rdpwrap.dll

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

It creates the following folders:

  • %Program Files%\RDP Wrapper

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

Other System Modifications

This Hacking Tool modifies the following registry entries:

HKLM\SYSTEM\ControlSet001\
services\TermService\Parameters
ServiceDll = %ProgramFiles%\RDP Wrapper\rdpwrap.dll

HKLM\SYSTEM\ControlSet001\
Control\Terminal Server
fDenyTSConnections = 0

HKLM\SYSTEM\ControlSet001\
Control\Terminal Server\Licensing Core
EnableConcurrentSessions = 1

HKLM\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
AllowMultipleTSSessions = 1

Download Routine

This Hacking Tool connects to the following URL(s) to download its configuration file:

  • https://{BLOCKED}.{BLOCKED}usercontent.com/stascorp/rdpwrap/master/res/rdpwrap.ini

Other Details

This Hacking Tool sets the attributes of the following file(s) to Hidden and System:

  • %AppDataLocal%\Microsoft\Windows\Temporary Internet Files\Content.IE5
  • %Application Data%\Microsoft\Windows\Cookies
  • %AppDataLocal%\Microsoft\Windows\History\History.IE5

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %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, 7, and 8.)

It does the following:

  • Executes the following command to add itself to firewall allowed profiles:
    • netsh advfirewall firewall add rule name="Remote Desktop" dir=in protocol=tcp localport=3389 profile=any action=allow
  • It has capabilities of the following depending on its configuration:
    • General Settings:
      • Single user per session
      • Hide users on logon screen
      • Allow to start custom programs
    • Authentication Mode:
      • GUI Authentication Only
      • Default RDP Authentication
      • Network Level Authentication
    • Session Shadowing Mode:
      • Disable Shadowing
      • Full access with user's permission
      • Full access without permission
      • View only with user's permission
      • View only without permission

  SOLUTION

Minimum Scan Engine: 9.850
VSAPI OPR PATTERN File: 2.117.00
VSAPI OPR PATTERN Date: 07 Nov 2018

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Identify and terminate files detected as HKTL_RADMIN

[ 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 4

Scan your computer with your Trend Micro product to delete files detected as HKTL_RADMIN. 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 the following Trend Micro Support pages for more information:

Step 5

Restore this modified 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.

RESTORE
  • Close Registry Editor.

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