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

Static analysis result for SHA-256 4c250eca51e80b11…

MALICIOUS

Office (OLE) / .XLS

287.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: 7a4ce8da8611137b0f0dde4b3258bf90 SHA-1: 6f7c819bb1e809cc13919956edc37b8c0acf8d9a SHA-256: 4c250eca51e80b116d93fd7aec9764e6856244b048a050959275aa90b7d6ad6d
120 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 presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests an attempt to execute code upon opening. ClamAV detection confirms its malicious nature, identifying it as Xls.Dropper.Agent-8025496-0. The encrypted nature and macro sheet structure point to a downloader or dropper functionality.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8025496-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8025496-0
  • 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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