Emotet Office (OLE) / .XLSX malware analysis — malicious · bb8d542272de5948

MALICIOUS

Office (OLE) / .XLSX

101.7 KB Created: 2022-01-21 14:27:47 Authoring application: Microsoft Excel

MD5: 81ba1d94c31dd24ab1909f218bb14306 SHA-1: a17aa67a0ed8e476d72900a375007f61ee612cf1 SHA-256: bb8d542272de59481c158a4dc124df60711bb06fd260c972a2c64f0acecf6705

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical indicator. The macro executes a command to download a payload from the URL 'http://0xb907d607/fer/fe3.html'. ClamAV also identified the file as Emotet, a known downloader family. The macro's intent is to download and execute a second-stage payload, consistent with Emotet's behavior.

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: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-bd646319c2d29cd6-9951195-0
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` `cd5d6e3253e3a898dc9d63d15113da3fd9fff8e87bda9543bb3d23d907be4b46`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2903 bytes

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