Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 81e021e321a21d22…

MALICIOUS

Office (OLE)

337.5 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 72a4c834245ffea83790ac85957b55fe SHA-1: 04055ea36cd028266a06cab4727bf5d19d266bd8 SHA-256: 81e021e321a21d225152253468fdc8c7ed956d306d5e586a46dedbe4bbbd8ebd
120 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN' heuristics. ClamAV detection as 'Xls.Dropper.Agent-9074450-0' further confirms its malicious nature. The presence of XLM macros suggests an attempt to execute arbitrary code upon opening, commonly used for initial access through spearphishing attachments.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9074450-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9074450-0
  • 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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