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

Static analysis result for SHA-256 cbf45507a74b1771…

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2020-04-27 23:19:44 Authoring application: Microsoft Excel
MD5: 2556372a3ce1c696eafc5210fd000ca2 SHA-1: 7405d7801f1c889174a29df10c9683961e100eb4 SHA-256: cbf45507a74b1771910814bd5dbe0407f0cf504fb836ac020b3ae4cee71250f0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. ClamAV detection confirms it as 'Xls.Dropper.Agent-7712660-0', suggesting its purpose is to drop or execute further malicious content. The presence of an auto-open macro further supports its role as an initial infection vector.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-7712660-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7712660-0
  • 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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