➔
search
✕

WORM_MAILSPAM.XDP

January 30, 2015
 Analysis by: Michael John Marcos
 ALIASES:

Trojan.Win32.Agent (Ikarus), Win32/Agent.WSO (Eset),

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Spammed via email

This malware which is downloaded by DYRE banking malware, has the capability to compose email messages in Microsoft Outlook with the UPATRE malware attached.

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

This worm may be downloaded by other malware/grayware from remote sites.

It may also compose messages that can be part of its spamming routine.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

451,584 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jan 2015

Payload:

Connects to URLs/IPs, Compromises system security

Arrival Details

This worm may be downloaded by the following malware/grayware from remote sites:

  • TSPY_DYRE.YYYP

Installation

This worm drops and executes the following files:

  • %User Temp%\{random file name}.bat

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Propagation

This worm may also compose messages that can be part of its spamming routine.

Backdoor Routine

This worm connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}7.{BLOCKED}7.71.173:1025

It posts the following information to its command and control (C&C) server:

  • Outlook version
  • Outlook platform
  • Windows version
  • Outlook email signature

Other Details

This worm deletes itself after execution.

NOTES:

This worm composes the spam email based on the parameters set in the C&C server.

The following parameters is requested by this worm in the C&C server to propagate:

  • type
  • send_to_all
  • additional_emails
  • client_connection_id
  • message_attach
  • attach_type
  • attach_name
  • attach_data_base64
  • email
  • subject
  • content
  • id_string

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.434.01

FIRST VSAPI PATTERN DATE:

14 Jan 2015

VSAPI OPR PATTERN File:

11.435.00

VSAPI OPR PATTERN Date:

14 Jan 2015

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

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.  
  • %User Temp%\{random filename}.bat

Step 3

Scan your computer with your Trend Micro product to delete files detected as WORM_MAILSPAM.XDP. 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.


Did this description help? Tell us how we did.