Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a2289a7fd0d7a824…

MALICIOUS

Office (OLE)

169.0 KB Created: 2020-04-08 14:30:53 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: ab58e24a2c682449ea1ebd95995b9221 SHA-1: 81235fccb5f465bdfeb1d1887c5aa27db62d80fa SHA-256: a2289a7fd0d7a824d9162e3eab6d510418442b25a28bffe2036dcd2057ceb27b
160 Risk Score

Malware Insights

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

The sample is an encrypted Excel 4.0 macro sheet, identified by ClamAV as Xls.Dropper.Agent-8803964-0. The presence of encrypted macros and the ClamAV detection strongly suggest it functions as a dropper, likely intended to download and execute a secondary malicious payload.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-8803964-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803964-0
  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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