Emotet Office (OLE) / .XLS malware analysis — malicious · ade5c2c45c5bbae9

MALICIOUS

Office (OLE) / .XLS

70.6 KB Created: 2022-01-20 19:00:43 Authoring application: Microsoft Excel

MD5: 3f7f1f6050609317474b8f48efa00e88 SHA-1: c95bfbc3794a4371d3b5a6702052d662dee19a15 SHA-256: ade5c2c45c5bbae939364326ae43a74c8b0c93307b7c653b12b80cbe8e891b70

140 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic T1204.002 Malicious File Execution: User Execution: Malicious File

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, and ClamAV specifically identifies it as 'Doc.Downloader.EmotetExcel01220-9937164-0'. This strongly suggests the file's purpose is to act as a downloader for the Emotet banking trojan. The XLM macros are likely responsible for initiating the download and execution of the next stage.

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.EmotetExcel01220-9937164-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel01220-9937164-0
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` `7f1f89a8b36a750dced08313a4e4f056192a6eac7194357c673dbbd2670a1a18`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	4219 bytes

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