Office (OLE) / .XLS malware analysis — malicious · c8a2dee9ba444fe1

MALICIOUS

Office (OLE) / .XLS

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

MD5: 9e1125540cbd16093e29e57111ec7e76 SHA-1: d9306ea52ef1e4d589ec15cf28fbfbcd698a3bae SHA-256: c8a2dee9ba444fe1324b7970268ac1e77b64f77e8947bd72177983e8c7982d7c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Service Execution

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open defined name to execute a command. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, which is a common lure for macro-based malware. The extracted macro script reveals a command that reconstructs to 'cmd /c mshat http://0xc12a24f5/cc.html', indicating the likely intent to download and execute a second-stage payload from the specified URL.

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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