Emotet Office (OLE) / .XLSX malware analysis — malicious · ec527c59ba416c8e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 840f25511cd2433b3d04ba4d5f35bba5 SHA-1: b5dff9d05f0bc10d6cdc5814660553929280b5bb SHA-256: ec527c59ba416c8eda361c7069ac38bf84ee678c4b0b0c60588711a172a8d8cc

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a strong indicator of malicious intent. The macro executes a command using `mshta` to download a payload from a hardcoded URL. The ClamAV detection name 'Doc.Downloader.EmotetExcel01220-9936774-0' further supports the Emotet family attribution and the downloader functionality.

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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