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

Static analysis result for SHA-256 4eb4905c3dcc9655…

MALICIOUS

Office (OLE) / .XLS

64.6 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: e4dce6f474e7a5a6e3c86eebe6a835b8 SHA-1: ef5f1151c621223ed7f5bce0ea24d4e2df183579 SHA-256: 4eb4905c3dcc9655e0618f8cc1defc43bfe3e375e497a18dbe724518f0b1f6c5
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 sheet (XLM) that uses an Auto_Open function to execute a command. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', a common lure to bypass security measures. The extracted macro code reveals a command that attempts to download a payload from the URL "http://0xc12a24f5/cc.html". This indicates the file's purpose is to download and execute a second-stage payload.

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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