Emotet Office (OLE) / .XLSX malware analysis — malicious · bbb0d9096b57b510

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 20208c00318433edc5b96e23efbed34d SHA-1: d963982b1198e67ec5cc2c81b4d3b639cde697c0 SHA-256: bbb0d9096b57b510f84f8b3100abcfa22d6b39dbdd0d182d403e6b78db9b4cff

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File Execution: User Execution of 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 one of two hardcoded URLs. This behavior is consistent with Emotet's typical delivery mechanism, which often involves macro-enabled documents acting as downloaders for further stages.

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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