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Aliases: Trojan:WinNT/Necurs.A (Microsoft), Hacktool.Rootkit (Symantec), Troj/Necurs-M (Sophos), W32/Necurs.B!tr (Fortinet), Rootkit.Necurs.3012 (VBA32)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
In the wild: Yes

This Trojan arrives as a component bundled with malware/grayware packages.

File size: 59,776 bytes
File type: SYS
Memory resident: Yes
Initial samples received date: 19 Oct 2012

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

It may be installed as a service or loaded by other components. It may be used as an aid in performing the malicious routines of its main components.

Minimum scan engine: 9.300
First VSAPI Pattern File: 9.472.04
First VSAPI Pattern Release Date: 19 Oct 2012
VSAPI OPR Pattern Version: 9.473.00
VSAPI OPR Pattern Release Date: 20 Oct 2012

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 RTKT_NECURS.D

Step 3

Restart in Safe Mode

Step 4

Search and delete the file detected as RTKT_NECURS.D

Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RTKT_NECURS.D. 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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Analysis By: Anthony Joe Melgarejo