Office (OLE) / .XLSX malware analysis — malicious · 52f569290a09a575

MALICIOUS

Office (OLE) / .XLSX

378.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: 6ec769eb9e7e8adb9ff9922d1a9f6722 SHA-1: dd3c12cce7dcb3658307031f5a0d9d346446bb43 SHA-256: 52f569290a09a5759d509d897d08b728def48a0679270890ee3f3555e5f0b6db

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, including an Auto_Open entry, which is a strong indicator of malicious intent. The presence of a 'Macro/content-enable lure' heuristic and the document body text instructing the user to enable macros further supports this. The macro sheet likely attempts to download a second-stage payload from the URL http://rmdwk19obfzrq03ohby.xyz/apple.gif.

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.

Filename	Kind	Source	Size
`xlm_macros.txt` `855e443b676f37217d33677a9c6a10a49b0648d00e8aa00f6d93fbdd2229abce`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4016 bytes

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