Xls.Dropper.Agent-9107186-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 f80b4a3bdc4b3985…

MALICIOUS

Office (OLE)

414.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: ce7192bd65e6760f0a2cccdd9140e635 SHA-1: aa4ed8f97eac35a82a56bd8d19b771e616205dc6 SHA-256: f80b4a3bdc4b3985a752d80ef444e46307bb3744d19bd2a00a992908e3fa9e21
120 Risk Score

Malware Insights

Xls.Dropper.Agent-9107186-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV heuristic and high-severity heuristic for encrypted Excel 4.0 macros indicate malicious intent. The presence of an auto-open macro suggests the file is designed to execute automatically upon opening, likely to download and execute a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9107186-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9107186-0
  • 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.