Office (OLE) / .XLS malware analysis — malicious · 51fefd04464d9264

MALICIOUS

Office (OLE) / .XLS

64.8 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel

MD5: 34c2145669156bc92bd1e664a3c8d11e SHA-1: ecaeb40630551c7f27582a3dc7ff99829d194c87 SHA-256: 51fefd04464d9264f44f53be171537f480331a10c787944e6d2aee4efaf9caa2

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: Malicious Link

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that executes a command to download a payload from the reconstructed URL 'http://0xc12a24f5/cc.html'. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', indicating a social engineering lure to bypass macro security. The XLM macro directly constructs and executes the command, suggesting a downloader functionality.

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` `0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1073 bytes

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