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

Static analysis result for SHA-256 2d681c0c3e2ac778…

MALICIOUS

Office (OLE)

13.0 KB Created: 1997-11-15 09:01:00 Authoring application: Microsoft Word for Windows 95 First seen: 2012-06-14
MD5: 75f28a5704216814eb1a2a019bd5d3a6 SHA-1: f6a733b37c91355943ee5885b00ac9b0f59739da SHA-256: 2d681c0c3e2ac7784c6e5caa0f1748a13c41732938e29da38a3bcd74a4791e62
102 Risk Score

Malware Insights

Win.Trojan.Oblom-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy WordBasic macro virus, specifically triggering the 'ToolsMacro' marker and being identified by ClamAV as Win.Trojan.Oblom-1. The document body contains strings indicative of a virus, such as 'Master of infection' and 'QUEEN FOREVER!!!', along with references to macro functions like 'AutoOpen' and 'FileSaveAs'. The presence of a hardcoded file path 'C:\VIRUS\freddie.doc' suggests a potential target or dropped file location.

Heuristics 3

  • ClamAV: Win.Trojan.Oblom-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Oblom-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) 193 bytes
SHA-256: 3ae138707c1176613006c2f560e6230eded1652e0c7c34da5e084ddff1510b71
Preview script
First 1,000 lines of the extracted script
= = = 21349          
        357 "c) 1997 Master of infection...   QUEEN F"
      29472    
  19827 * ,   ,  
29797 ,         = 20339 @cmd7365     @cmd726f    
  = =       = 3840 17184     = =

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