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

Static analysis result for SHA-256 3a12068f2e8db89d…

MALICIOUS

Office (OLE) / .XLS

89.5 KB Created: 2020-06-29 17:30:08 Authoring application: Microsoft Excel
MD5: 1580e540ad5fbaca156c0f63129c22fc SHA-1: f968d84ce60f50168cbc63e0cbaa3fbcc00995e0 SHA-256: 3a12068f2e8db89de560110edc5c93a29f92fd01cc51a5f4bfb14c12a862e84b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further suggests that it contains an Auto_Open macro, a common technique for executing malicious code upon opening the document. Due to the encryption and lack of readable document body or script content, the exact payload and delivery mechanism cannot be determined, but the structure strongly suggests a macro-based attack.

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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