This malware uses complex routines to hide in the infected system's master boot record (MBR) in order to evade detection.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
This Trojan creates a service for its dropped file. It executes its dropped files. As a result, malicious routines of the dropped file are exhibited on the affected system.
It deletes its dropped file after it executes.
It writes its code in the Master Boot Record (MBR). This routine enables it to start even before the operating system is loaded. As well, it also writes the abovementioned components in the MBR.
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.
File size: 84,992 bytes
File type: EXE
Memory resident: No
Initial samples received date: 28 Jun 2011
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.
Installation
This Trojan drops and executes the following files:
- %System Root%\alg.exe - detected as TROJ_POPUREB.SMB
- %Current%\hello_tt.sys - detected as RTKT_POPUREB.A
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
NOTES:
It creates a service for its dropped file. It executes its dropped files. As a result, malicious routines of the dropped file are exhibited on the affected system.
It deletes its dropped file, %Current%\hello_tt.sys, after execution.
It writes its code in the Master Boot Record (MBR). This routine enables it to start even before the operating system is loaded. As well, it also writes the abovementioned components, HELLO_TT.SYS and ALG.EXE, in the MBR.
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