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TROJ_DLOAD.ADR

September 07, 2013
 Analysis by: Jimelle Monteser
 ALIASES:

TrojanDownloader:MSIL/Tinrofe (Microsoft), Trojan horse Downloader.Generic13.AUWZ (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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:

7,680 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Jun 2013

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.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}o.com/Gormandizer/update.php
  • http://{BLOCKED}st.info/NexCPTime.exe

NOTES:

This Trojan adds the following registry keys when it runs on a Windows 7 system:

HKEY_LOCAL_MACHINE\Software\Microsoft\Tracing\{malware file name}_RASAPI32

HKEY_LOCAL_MACHINE\Software\Microsoft\Tracing\{malware file name}_RASMANCS

It adds the following registry entries when installed on a Windows 7 system:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASAPI32
EnableFileTracing = "0"
EnableConsoleTracing = "0"
FileTracingMask = "4294901760"
ConsoleTracingMask = "4294901760"
MaxFileSize= "1048576"
File Directory = "%Windows%\tracing"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\{Random Name}_RASMANCS
EnableFileTracing = "0"
EnableConsoleTracing = "0"
FileTracingMask = "4294901760"
ConsoleTracingMask = "4294901760"
MaxFileSize= "1048576"
File Directory = "%Windows%\tracing"

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.974.05

FIRST VSAPI PATTERN DATE:

11 Jun 2013

VSAPI OPR PATTERN File:

9.975.00

VSAPI OPR PATTERN Date:

12 Jun 2013

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

Scan your computer with your Trend Micro product and note files detected as TROJ_DLOAD.ADR

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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\Tracing
    • {malware file name}_RASAPI32
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Tracing
    • {malware file name}_RASMANCS

Step 5

Search and delete the files detected as TROJ_DLOAD.ADR

*Note: Some component files may be 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.

To stop the malware/grayware from running when certain files are opened:

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

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

For Windows Vista and Windows 7:

  1. Click Start>Computer.
  2. In the Search Computer input box, type the name of the file detected earlier, and press Enter.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 6

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

NOTES:

Step 4 is for Windows 7 systems affected with this malware. For non-Windows 7 users, please disregard Step 4.


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