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

TROJ_MDROP.AH Behavior Diagram

Malware Overview

This Trojan arrives as attachment to email messages spammed by another malware or a malicious user.

It may be dropped by other malware and may be downloaded unknowingly by a user when visiting malicious Web site(s).

It takes advantage of a known vulnerability in Microsoft Excel that allows remote code execution. More information on the said vulnerability is available in the following Microsoft Web page:

Once it successfully exploits the said vulnerability, it executes a shell code that allows it to drop any of several embedded files on the affected system, including TROJ_SMALL.DCJ, BKDR_AGENT.SNI, BKDR_PCCLIEN.AAA, and BKDR_PCCLIEN.AJT.

It then executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

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