Emotet Office (OLE) / .XLS malware analysis — malicious · 78a26f40d27e4775

MALICIOUS

Office (OLE) / .XLS

60.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-21

MD5: bb58d7ca49b20172117bd1385749096a SHA-1: c539677c1e63adf1be04c1ed145783fd227f7a4f SHA-256: 78a26f40d27e47759c1309178b4135a62bfe5c5d32abbebb568d59b676f06d06

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to execute automatically when the workbook is opened. The macros construct and attempt to download payloads from multiple URLs, indicating a downloader functionality. ClamAV detection further confirms its malicious nature, identifying it as Emotet.

Heuristics 4

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.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
ClamAV: Xls.Downloader.Emotet-ea85817e7e81383e-9951566-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ea85817e7e81383e-9951566-0
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` `a2d033763c15494b12e31c971331fca1f0f387966c5e482c3931d5611c30d5d1`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8260 bytes

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