Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 89e62ec08b0b6065…

MALICIOUS

Office (OLE)

59.0 KB Created: 2020-04-27 23:19:44 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: f30c98244e46bd4dbf2cb9bff3266f32 SHA-1: 20eb2787bf949af40dd04ea00550aeefa99b5e70 SHA-256: 89e62ec08b0b6065134c67937bae76ccd70163770fd6992574e41b9c82c3cf1c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as an Excel 4.0 macro sheet that is encrypted. This strongly suggests an attempt to hide malicious functionality, likely involving the execution of commands or scripts when the sheet is opened. The presence of the 'AUTOOPEN' heuristic further supports this, indicating an automatic execution trigger. No specific family could be identified due to the encryption and lack of further script details.

Heuristics 2

  • 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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