Office (OLE) / .XLSX malware analysis — malicious · 67f8780774c3fe29

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 4dbb9dd4fb0338231789ddb6f212db81 SHA-1: cbb6675fc4c22ec761113c031273bf8a4df857c7 SHA-256: 67f8780774c3fe29b299144f98bd737b6a1db59213a030cd1e1bc136f9914c3f

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating an attempt to automatically execute code upon opening. The presence of a 'Macro/content-enable lure' heuristic suggests the document prompts the user 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `e06e9fa526d89fdd0409d0c41bb984574fc832746d147eebbd3c5bf55a1e55d4`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4020 bytes

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