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

Static analysis result for SHA-256 d971e612187b9d95…

MALICIOUS

Office (OLE) / .XLSX

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13
MD5: baba7d15105dd2e90f790420aa00c7b5 SHA-1: 009cfdbdabf7cc10e61a75f86739a7abdcf13e94 SHA-256: d971e612187b9d95472fc79a49131f03fcdab70492b075bd4af27e39146a8cff
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it's designed to execute automatically upon opening. The presence of a 'Macro/content-enable lure' heuristic and the document body text suggest the user is prompted to enable macros. The extracted URL 'http://wyhfi19vkwt03hcrle.xyz/apple.gif' is likely used to download a secondary 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
c2dc2d27a90e87fdcc044c59aed45fe776e1b180d63fa23ffc4ef09a815d1305		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4016 bytes

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