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

Static analysis result for SHA-256 5294eb9f95967fc0…

MALICIOUS

Office (OLE) / .XLS

409.0 KB Created: 2020-11-18 21:59:48 Authoring application: Microsoft Excel
MD5: 1f820167d901345a2f14fd588fe0260b SHA-1: d495f5482d4646f8535785d4317e8b1b2a986ce0 SHA-256: 5294eb9f95967fc0bb8b148edbed12826b818e747f779ad3c87ad76e21783443
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests that malicious code is intended to execute automatically upon opening the file. The document body is heavily obfuscated 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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