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

Static analysis result for SHA-256 895755edc925d899…

MALICIOUS

Office (OLE) / .XLS

209.5 KB Created: 2021-12-16 12:07:56 Authoring application: Microsoft Excel
MD5: 3124b97a05b4edaf45b5bfc40b804404 SHA-1: 54f7c459f1a7520399225b286004ffd92989987d SHA-256: 895755edc925d89938a02b4629bafdc06b96877d72bbbcbabe523c33a1bc63a9
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) further suggests that malicious code is intended to execute automatically when the file is opened. The document body content is heavily truncated and unreadable, providing no further clues about the specific lure or payload.

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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