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

Static analysis result for SHA-256 5722e910e2051cdc…

MALICIOUS

Office (OLE) / .XLS

117.5 KB Created: 2020-10-06 03:02:09 Authoring application: Microsoft Excel
MD5: 2e9bd968946d127c9467c35329f994bc SHA-1: 4cd8cfedddcd335350ba376006de50f0871ae651 SHA-256: 5722e910e2051cdce18119ddd2ffed98c56d9c02349af190d37a5e18113bf895
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AutoOpen macro (OLE_XLM_AUTOOPEN) suggests that the malicious code executes automatically upon opening the file. The document body is unreadable due to encryption, preventing further analysis of the specific lure or payload. The primary attack vector is the execution of embedded XLM macros.

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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