Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 f439af2f1fb15b3a…

MALICIOUS

Office (OLE) / .XLSX

64.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-04-20
MD5: 805ee453aedecda0305713f7afb16015 SHA-1: 816d329839358f14f282e808782b1eaa981be79c SHA-256: f439af2f1fb15b3a9d2b2924d8c602579823ac5cc1314f2a01c2e0c2717e2285
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059 Command and Scripting Interpreter

The file is an Excel spreadsheet containing VBA macros. The critical heuristic 'OLE_VBA_SHELL' and high heuristic 'OLE_VBA_PCODE_AUTOEXEC_EXEC' indicate that the macros are designed to execute commands using the Shell() function, likely upon opening the workbook as indicated by the 'Workbook_Open' event. The document body content appears to be financial or business-related information, likely a lure to encourage macro execution. No specific IOCs were extracted beyond the presence of VBA macros.

Heuristics 3

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b27023306af1f5b63347c0ef6f414d107b63e5a5d98ec43292f4ebdba27a3d99		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2820 bytes

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