Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 23ade68c3bd6e2a1…

MALICIOUS

Office (OLE)

90.5 KB Created: 2020-07-13 15:38:54 Authoring application: Microsoft Excel
MD5: 9c3690174951e5671dfecd0cea0b0e8f SHA-1: e2b895c22b0f40bf45b6b97256d193f119660ebd SHA-256: 23ade68c3bd6e2a1be4b9cf48e5e9d08a1dd06219595087dc9607d1e20db8f40
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. The macro is designed to download a second-stage payload from the URL 'http://sorbeingduq.cmlBvkFxURMONdwAJCSE\QYGKyIfZVP'. ClamAV also identified this as a dropper agent.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-8867419-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8867419-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
79ebf0757562d1e83eb3472d300d129c116d934b1de308e1e2d28b8128a158ae		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 22745 bytes

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