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Threat Encyclopedia

TROJ_UPATRE.YYMV


ALIASES:

Troj/DwnLdr-LPP (Sophos) ,Trojan horse Generic10_c.CKBE (AVG) ,W32/Zbot.TAZF!tr (Fortinet) ,W32/Trojan3.IMF (exact) (Fprot) ,Trojan.Crypt (Ikarus) ,Trojan-Spy.Win32.Zbot.tazf (Kaspersky) ,TrojanDownloader:Win32/Upatre (Microsoft) ,Generic.sq (McAfee) ,Win32/TrojanDownloader.Waski.D trojan (Eset) ,Downloader.Upatre (Symantec) ,Trojan.Win32.Generic.pak!cobra (Sunbelt)

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:
INFORMATION EXPOSURE:

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This malware was used in a spam campaign that uses Dropbox as a social engineering lure in order for users to click the related links.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes itself after execution.

TECHNICAL DETAILS

File Size:

23,040 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jun 2014

Payload:

Downloads files, Connects to URLs/IPs

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

  • %User Temp%\pdfmarks.exe

(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.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • https://{BLOCKED}ping-myrtle-beach.com/wp-content/uploads/2014/05/2805UKdw.dkt

It saves the files it downloads using the following names:

  • %User Temp%\yaccpdf.exe - detected as TSPY_ZBOT.YYMV

(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.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan deletes itself after execution.

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.840.03

FIRST VSAPI PATTERN DATE:

04 Jun 2014

VSAPI OPR PATTERN File:

10.841.00

VSAPI OPR PATTERN Date:

04 Jun 2014

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

Remove the malware/grayware file dropped/downloaded by TROJ_UPATRE.YYMV. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 3

Identify and terminate files detected as TROJ_UPATRE.YYMV

[ 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 TROJ_UPATRE.YYMV. 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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