Xls.Dropper.Agent-9157742-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 c2cdef7c7ca6c449…

MALICIOUS

Office (OLE)

351.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: fd43a994cba26ec427b9e1b19be8b7e5 SHA-1: 1b20ae3026c47321e4a2eaa7c0f9ee087fd24d4b SHA-256: c2cdef7c7ca6c449b0dce22296f2c66b3a791f626770ce2527954210c803cb77
120 Risk Score

Malware Insights

Xls.Dropper.Agent-9157742-0 · confidence 95%

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

The critical ClamAV heuristic and the presence of encrypted Excel 4.0 macros indicate a malicious dropper. The macro sheet BOF marker suggests the presence of executable code within the macro sheet, likely responsible for downloading and executing a secondary payload. The file is identified as Xls.Dropper.Agent-9157742-0.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9157742-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9157742-0
  • 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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