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

Static analysis result for SHA-256 52eece12fa79493c…

MALICIOUS

Office (OLE) / .XLS

319.0 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: 713abe9eb60dfae3342565d28ff9b055 SHA-1: 9a41f9893ee6f92a31ba90fd4e29060dde810198 SHA-256: 52eece12fa79493c3bfe2784112a4aca5b66050dd1358369dd89608acbaeb736
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, identified by ClamAV as Xls.Dropper.Agent-8494647-0. The presence of an encrypted macro sheet and the ClamAV detection strongly indicate a malicious dropper functionality. The file's purpose is to deliver a secondary payload, likely through the execution of embedded XLM macros.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8494647-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8494647-0
  • 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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