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

Static analysis result for SHA-256 95bd7a62ced0c803…

MALICIOUS

Office (OLE) / .XLSX

172.5 KB Created: 2020-06-30 10:47:30 Authoring application: Microsoft Excel
MD5: ac016bd363b76505c4b5f55fa92bf343 SHA-1: 245a98cac3ab0bb615aa265c2774e34c1fcf2bd3 SHA-256: 95bd7a62ced0c80358c8e3fd12bb8acb9aecea2b35fa43e7a343cb38ae233e5f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1546.003 Event Triggered Execution: Windows Management Instrumentation Event Subscription

The file is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is present and configured to execute automatically when the workbook is opened. This macro utilizes CreateObject, a common technique for launching malicious payloads. The presence of a Workbook_Open macro that executes VBA code via CreateObject strongly suggests an automated malicious execution flow, likely intended to download and execute a secondary payload or perform other harmful actions.

Heuristics 5

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
c01feb45ab03f0bccfd32a97866ea856747573e4155970b69b6a477e5e0cc2d3
vba-macro oletools.olevba.extract_macros (decoded VBA source) 2204 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.