Xls.Dropper.Agent-8859627-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 de032555e5d7acef…

MALICIOUS

Office (OLE)

524.5 KB Created: 2020-07-14 08:40:55 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 8734774af3e2c5920e7a12ac8f5aac9e SHA-1: 10229a863500a9a5b34ce917bf34a334baac677c SHA-256: de032555e5d7aceffb24e42e90b928e6e36deab19d5d8096644ab51bcb31755c
120 Risk Score

Malware Insights

Xls.Dropper.Agent-8859627-0 · confidence 95%

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

The critical ClamAV heuristic and the presence of an encrypted Excel 4.0 macro sheet indicate this file is a dropper. The macro sheet likely contains code to download and execute a secondary payload, consistent with the identified family.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8859627-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8859627-0
  • 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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