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

Static analysis result for SHA-256 d154427a4f032854…

MALICIOUS

Office (OLE) / .XLS

64.9 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: b115aa8eb6b581f6b2ffb69b2a702acb SHA-1: b05f20e20554d6ef9b9b3de59d9f503a3463ed44 SHA-256: d154427a4f032854f4599a519ef1878b76434bd2452e0c608dd10951f5032f67
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet that employs a macro-enable lure. The embedded XLM macro defines a name 'lll' which executes a command to download a payload from the reconstructed URL http://0xc12a24f5/cc.html. This indicates the document's purpose is to act as a downloader for further malicious content.

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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