Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61741b3b7c3ea966…

MALICIOUS

Office (OLE)

514.0 KB Created: 2020-07-14 08:40:55 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: c12b6b3320e173dc205e7f47d23307f7 SHA-1: d33ea64ead4e6b68760cd961d013e6a829381fbd SHA-256: 61741b3b7c3ea966b893de091e59f96510b855a024a371546845b5f4e51d6f3d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests an intent to execute code immediately upon opening the document. Without further deobfuscation or script content, the exact payload and delivery mechanism remain unclear.

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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