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TROJ_UNRUY.SMKV

July 24, 2013
 Analysis by: jasperm
 Modified by: Jasen Sumalapao
 ALIASES:

TrojanDownloader:Win32/Unruy.I (Microsoft), W32.Unruy.A (Symantec), Downloader-BZH.gen.a (NAI), Mal/Unruy-D (Sophos), Trojan-Downloader:W32/Unruy.I (FSecure), Trojan-Downloader.Win32.Unruy.q (v) (Sunbelt), W32/Agent.EA (Antivir), W32/Hupigon.AA.gen!Eldorado (Authentium), Gen:Variant.Unruy.5 (Bitdefender), W32/Unruy.D!tr (Fortinet), W32/Hupigon.AA.gen!Eldorado (generic, not disinfectable) (Fprot), Trojan.Win32.Agent (Ikarus), a variant of Win32/Obfuscated.NEZ trojan (NOD32), Generic (Panda), BScope.Trojan.TE.01527 (VBA32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

977,912 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Aug 2010

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.

Other Details

This Trojan connects to the following website to send and receive information:

  • {BLOCKED}3-domain.com

NOTES:

It does the following:

Enumerates the entries in the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

It then overwrites the files referenced in these registries with copies of itself.

It also overwrites the all running process, except system files, with the copy of itself.

The legitimate files are saved as {filename}, the extension is deleted with hidden attribute.

  SOLUTION

Minimum Scan Engine:

9.200

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 TROJ_UNRUY.SMKV

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the files detected as TROJ_UNRUY.SMKV

*Note: Some component files may be 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.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

For Windows Vista and Windows 7:

  1. Click Start>Computer.
  2. In the Search Computer input box, type the name of the file detected earlier, and press Enter.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_UNRUY.SMKV. 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.

NOTES:

Restore the filenames of the overwritten files by adding .EXE on the affected files. These files can be found, with Hidden attribute, in the same folder where this Trojan is detected.


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