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

Static analysis result for SHA-256 6d1ca1cf63c8cffc…

MALICIOUS

Office (OLE) / .XLS

210.0 KB Created: 2020-10-01 02:52:46 Authoring application: Microsoft Excel
MD5: 3266293a1373108f98f15fecbf48f407 SHA-1: 55d9c9087f4612b2ce0669099801df2e61bec0eb SHA-256: 6d1ca1cf63c8cffca25ce8288a515006a3afd7dcc66c8f9169a4e38af7a0ae76
60 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AutoOpen macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. This points to a macro-based attack, commonly used for initial access through spearphishing attachments.

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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