Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 94de9339ec227a42…

MALICIOUS

Office (OLE)

697.0 KB Created: 2020-07-08 08:53:56 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: e24db78c4d4fda4b221a7d553c6f20e6 SHA-1: e41f581df80cf5ccdcd0c7019d0d03ab6e5c6bb3 SHA-256: 94de9339ec227a42e376a827db37564436f084e8efcca15530242d88c58e0c27
120 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-9020791-0. Static analysis reveals it is an encrypted Excel 4.0 macro sheet, indicating it was likely delivered as a spearphishing attachment. The presence of XLM macros suggests an attempt to execute arbitrary code, likely to download and run a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9020791-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9020791-0
  • 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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