TROJ_DLOADR.AUSULP

June 19, 2018
 Analysis by: John Anthony Banes
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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.

It connects to certain websites to send and receive information. It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

175,104 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Jun 2018

Payload:

Connects to URLs/IPs, Steals information

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.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

(Only present if Windows Major version is below 6)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
dl = {malware path and filename}

Dropping Routine

This Trojan drops the following files:

  • {malware path}\config.ini - configuration file

Other Details

This Trojan connects to the following website to send and receive information:

  • http://dev.{BLOCKED}k.com.cn/dl/GetUpDateInfo.php?Uid={value}&Mid={value}&AppVer={malware version}&SysVer={os version}&Is64={value}&InstTime={value}&DefBrowser={value}&Sd={value}&Sign={value}
  • http://dev.{BLOCKED}k.com.cn/dl/stat.php?Uid={value}&Mid={value}&AppVer={malware version}&SysVer={OS Version}&Is64={value}&InstTime={value}&DefBrowser={value}&Sd={value}&Sign={value}
  • http://dev.{BLOCKED}k.com.cn/dl/SoftList.php?IsFirst={value}&Uid={value}&Mid={value}&AppVer={malware version}&SysVer={OS Version}&Is64={value}&InstTime={value}&DefBrowser={value}&Sd={value}&Sign={value}
  • http://dev.{BLOCKED}k.com.cn/dl/StatisticsPopularize.php?Id={value}&Success={value}

It does the following:

  • It accesses to the said websites to update the configuration file. The configuration file may contain URLs where it downloads files and the filename to be used for the downloaded file.
  • It accesses the following website to update itself:
    • http://{BLOCKED}.{BLOCKED}.com.cn/dl/DownLoad/dl.exe

It gathers the following information and reports it to its servers:

  • Malware version
  • Operating System Version
  • System Type (32-bit or 64-bit)
  • Default Browser

It adds the following scheduled tasks:

  • (Only present if Windows Major version is 6 or above)
    Task Name: dl
    Location: Task Scheduler Library\Microsoft\Windows\Task Manager
    Schedule: At log on of any user
    Task to run: {malware path and filename}

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.310.03

FIRST VSAPI PATTERN DATE:

12 Jun 2018

VSAPI OPR PATTERN File:

14.311.00

VSAPI OPR PATTERN Date:

13 Jun 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 TROJ_DLOADR.AUSULP

[ 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

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\Run
    • dl = {malware path and filename}

Step 5

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • Task Name: dl (located at: Task Scheduler Library\Microsoft\Windows\Task Manager)
  • Task to run: {malware path and filename}

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

Step 6

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.
  • {malware path}\config.ini

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.AUSULP. 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:


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