Office (OLE) / .XLSX malware analysis — malicious · 37029ffaf8784e69

MALICIOUS

Office (OLE) / .XLSX

61.1 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: f3914aeb06a7ed87af17099d8f6044ea SHA-1: dae15e26f754060361e3b66378169e76a2cc561d SHA-256: 37029ffaf8784e69ca60e4f34de09623001928c7a7c24e74abe50d5c173da19c

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is an Excel file containing Excel 4.0 (XLM) macros. It includes an Auto_Open defined name that executes a command to download a file from the reconstructed URL "http://87.251.86.178/pp/cc.html". The document body also contains a lure to enable editing and content, which is a common tactic for macro-enabled malware.

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` `1b5d2c0fd960b0ccb52c9814b8358c9c313741806cb2c5ef8340a3322e5a67a4`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1391 bytes

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