Xls.Dropper.Agent-9090983-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 be40263387f1cdc1…

MALICIOUS

Office (OLE)

334.0 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: cd5224ede92e12762df65407d7822073 SHA-1: a7dcf6e5ae6944173d1afffb774d0e6e8f97912f SHA-256: be40263387f1cdc1805496cfdd1e353dd442cadd574cf204e232abad74a983e7
120 Risk Score

Malware Insights

Xls.Dropper.Agent-9090983-0 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-9090983-0. Static analysis revealed the presence of encrypted Excel 4.0 macros, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristics. These macros are commonly used to download and execute further stages of malware.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9090983-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9090983-0
  • 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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