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

Static analysis result for SHA-256 d95fcdee566150bc…

MALICIOUS

Office (OLE) / .XLS

196.5 KB Created: 2020-10-20 04:52:28 Authoring application: Microsoft Excel
MD5: 692cd6813599aa9fae57323d14759045 SHA-1: 188f03b62c0e043013137e66992ea7bc3db433c7 SHA-256: d95fcdee566150bc9c7c8a7ed787112eeb479c0bc41aa9c71c071be346f3e087
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it is designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, providing no further clues about the specific lure or payload. Due to the lack of readable content and scripts, the exact execution flow and final payload remain undetermined.

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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