Xls.Dropper.Agent-9020528-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 8c03760da7e52aae…

MALICIOUS

Office (OLE)

334.0 KB Created: 2020-07-21 07:21:33 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 3180b47c4c8ecf1ab5a47bf6a92b8fc6 SHA-1: 05d8dcd538662959d53f5880b61045c9d5bad3e5 SHA-256: 8c03760da7e52aae5db56c75667b93285ee3ee7a89f35372564596d3fc42b2c2
120 Risk Score

Malware Insights

Xls.Dropper.Agent-9020528-0 · 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-9020528-0. Static analysis revealed an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to deliver a secondary payload upon opening, a common tactic for initial access through spearphishing attachments.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-9020528-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-9020528-0
  • 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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