Win.Trojan.Wazzu-20 — Office (OLE) malware analysis

Static analysis result for SHA-256 7699d8ac3bfccbfe…

MALICIOUS

Office (OLE)

6.0 KB First seen: 2012-06-14
MD5: d49b2865ff3c8ff2657c08c7218b5e51 SHA-1: 3b34c6025cdc1df16ab90e8fdfec74c665157853 SHA-256: 7699d8ac3bfccbfe8f1e9586ecc15b5fbca7c373889905963ae6eb2ae0d7f92b
102 Risk Score

Malware Insights

Win.Trojan.Wazzu-20 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of a legacy WordBasic macro virus, specifically identified by ClamAV as Win.Trojan.Wazzu-20. The document body contains markers and text commonly associated with older macro viruses, including references to 'RSN MACRO VIRUS Goat file' and embedded strings that appear to be part of the macro's functionality. The presence of legacy macro virus markers strongly suggests the file's intent is to execute malicious code via the macro interpreter.

Heuristics 3

  • ClamAV: Win.Trojan.Wazzu-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Wazzu-20
  • 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) 287 bytes
SHA-256: 0e79f85359d72766d49a2cd954cfa94dcd4668781e32b38bcd73e8420abe7e1c
Preview script
First 1,000 lines of the extracted script
29551
MAIN
, - * Abort
Answer = @cmd802b "Infect?" , 36
Answer = 1
Where$ = @cmd80af @cmd8009 @cmd818e @cmd80b8 0 , 10
Where$ = "NORMAL.DOT"
@cmd80c2 "Global:autoClose" , @cmd8025 = ":AutoClose"
@cmd0054 = @cmd8025 , = 1
@cmd80c2 @cmd8025 = ":autoClose" , "Global:AutoClose"
@cmd00d1 = 0

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