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

Static analysis result for SHA-256 90f9c9a091f4bd32…

MALICIOUS

Office (OLE) / .XLS

197.0 KB Created: 2020-10-13 20:44:56 Authoring application: Microsoft Excel
MD5: dc8f96713ad4df5054f503963e5e63df SHA-1: c88057e5b189d2c52e34091fb6d804f262b3e860 SHA-256: 90f9c9a091f4bd32511cd1da0d9843690aa705e235a0e7960c5d333f7a2688ed
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. Excel 4.0 macros are often used as a delivery mechanism for malware. The presence of an encrypted macro sheet suggests an attempt to obscure malicious code execution. No specific IOCs were extracted from the document body or scripts.

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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