Xls.Dropper.Agent-8803901-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 943ab02e1e696702…

MALICIOUS

Office (OLE)

695.0 KB Created: 2020-07-08 08:53:56 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: 75b5a1d2000cc0d59286988b5dbe90db SHA-1: 9b20d39a905bf51e479ee38808a1748f58f35199 SHA-256: 943ab02e1e6967020b8b9141318c86201c9d99d9f2ee7770485ffd2becd68557
120 Risk Score

Malware Insights

Xls.Dropper.Agent-8803901-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as malicious by ClamAV with the signature Xls.Dropper.Agent-8803901-0. Static analysis revealed encrypted Excel 4.0 macros, specifically an AutoOpen macro, indicating an attempt to execute arbitrary code upon opening. The presence of these macros suggests the file functions as a dropper for a secondary payload.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-8803901-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8803901-0
  • 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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