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

Static analysis result for SHA-256 3c8d49a046157a3e…

MALICIOUS

Office (OLE) / .XLSX

62.6 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 1a75d7b34fe91378306fe01fd0e6d538 SHA-1: 6cb137bd65824d89c948f7963746dbff9abf822b SHA-256: 3c8d49a046157a3efca16ecd5e1786f4e1a169c2937572c322165f0048c34ed8
100 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros. It uses a common lure to trick users into enabling macros. The Auto_Open macro executes a command to download a file from the URL http://87.251.86.178/pp/oo.html. The macro also defines a name 'SSDGO' which contains a similar command pointing to http://87.251.86.178/pp/aa.html, suggesting a secondary download or alternative payload delivery.

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
5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1514 bytes

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