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

Static analysis result for SHA-256 cd441f0c335ac8e9…

MALICIOUS

Office (OLE) / .XLSX

378.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13
MD5: 3fb15972369e026e954039c2e6e047ba SHA-1: ed29d15a479ccf88a3c3843aed1ffe0ff8ae8b2b SHA-256: cd441f0c335ac8e98f04e42555ad9f7979a34fa67eca50c45778546a9f788fab
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic, VBScript, JavaScript, and PowerShell T1204.002 Malicious File

The sample contains an Excel 4.0 macro sheet with an Auto_Open entry, indicating automatic execution upon opening. A heuristic firing for 'SE_ENABLE_LURE' confirms the document prompts the user to enable macros. The macro likely downloads a second-stage payload from the URL h ttp://rmdwk19obfzrq03ohby.xyz/apple.gif, as suggested by the embedded URL and the 'lRegis...nload To File' text.

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
855e443b676f37217d33677a9c6a10a49b0648d00e8aa00f6d93fbdd2229abce		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4016 bytes

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