Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 09aaf76906e71069…

MALICIOUS

Office (OOXML)

94.6 KB Created: 2021-07-01 18:23:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-24
MD5: d3f5e921dbdd2a4266cb376f3ec9dde5 SHA-1: 27367a89c1577466cf1077da6c04653b36455a48 SHA-256: 09aaf76906e71069642a67b8608246bc5cffde207986d8928116b4a614200f57
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open macro and CreateObject call heuristics. The macro displays conversational messages to the user, including a Base64 encoded string 'RkxBR3taYXJhcmzEsU9sYWJpbGlyZGltQW1hRGXEn2lsaW19', which may be a flag or payload indicator. While the macro's direct malicious action is not immediately apparent, its presence and auto-execution suggest an attempt to engage the user or hide other malicious activities, characteristic of a phishing attachment.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • 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://ocsp.digicC In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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/2020/wordml/sdtdatahashIn 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)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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) 1986 bytes
SHA-256: 91e7759fef7798f1cc40da6c7ab9418cab43f53f0c9be211d41ffabc1e4abc79
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
Function ZararlýYazýlýmMesajý()
   
    sonuc = MsgBox("Bu word macrosunu sanal makinada mý çalýþtýrdýn?", 4, "Hoþ Geldiniz!")
    If sonuc = 6 Then
        sonuc2 = MsgBox("Helal olsun bee, doðru karar vermiþsin. Eðer sanal makinede olmasaydýn þu anda hacklenmiþ olurdun. Pekii sence flag'i hakettin mi?", 4, "Helal olsun!")
    Else
        MsgBox ("Oouuu bu büyük bir hata! HACKLENDÝN!!!! þaka þaka hacklenmedin, yani þimdilik, eðer gerçekten zararlý bir yazýlým olsaydým hacklenmiþ olurdun ve þu anda sen bu yazýyý okuyorken tüm kiþisel bilgilerini ele geçiriyor olurdum! Bir sonraki analizinde buna dikkat et! Þimdilik için rahat olsun, zararlý deðilim :) Lütfen tekrar dene!!!")
    End If
      
End Function
Function DecodeBase64(b64$)
    Dim b
    With CreateObject("Microsoft.XMLDOM").createElement("b64")
        .DataType = "bin.base64": .Text = b64
        b = .nodeTypedValue
        With CreateObject("ADODB.Stream")
            .Open: .Type = 1: .Write b: .Position = 0: .Type = 2: .Charset = "utf-8"
            DecodeBase64 = .ReadText
            .Close
        End With
    End With
End Function
Sub Document_Open()
ZararlýYazýlýmMesajý
maybeFlag = DecodeBase64("RkxBR3taYXJhcmzEsU9sYWJpbGlyZGltQW1hRGXEn2lsaW19")
End Sub


Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{0D0F2A12-4B48-438E-8264-6EAFBD441B03}{3BACACDC-1760-4FA4-88C3-378B82554129}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub UserForm_Click()

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 22016 bytes
SHA-256: a6a40c0a2355b1d770792491e2345de391cf3092f9faf457a9e2d833247577af

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