Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 277d042525c05436…

MALICIOUS

Office (OLE)

334.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 22a6aeda0dc21144a8fbe951b3867caf SHA-1: 830de311f28be27a6ee05022ad32a5d7ea407b4b SHA-256: 277d042525c05436f089a9d6ebbb0f9d865c07719f83015124b38e14917b701c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, which is a strong indicator of malicious intent. The presence of 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN' heuristics suggests that the macro sheet is designed to run automatically upon opening. While no specific URLs or scripts were extracted, the encrypted nature and macro sheet presence strongly suggest it's a downloader for a secondary payload.

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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