Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 96dd5f0a583153be…

MALICIOUS

Office (OLE) / .XLS

277.0 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: 625e5226fed988549019c371eff40eb7 SHA-1: e28d08f46fc2e7a7e85acb7c8e43456b1049cc57 SHA-256: 96dd5f0a583153be89e7094a6c1b06b4f29c25dfd3fea204e3565a65502eec1d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) further suggests that malicious code is intended to execute automatically when the file is opened. No specific IOCs were extracted, and the document body was unreadable.

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.