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

Static analysis result for SHA-256 6f9fd74230477180…

MALICIOUS

Office (OLE) / .XLS

65.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 93926e96c58d3106e9361e6bd40b4776 SHA-1: a142cf32e4e33e4499557e8fe28bae66d8e12fb7 SHA-256: 6f9fd74230477180b49c0b7bb4dce190b59aef712398e764a6ff94e247c1c8e4
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet, identified as malicious due to encrypted macros and an auto-open macro. Excel 4.0 macros (XLM) are an older scripting language that can be used to download and execute arbitrary code, often leveraged in phishing attacks.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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