Emotet Office (OLE) / .XLS malware analysis — malicious · 8ddb5e80d11c3bd9

MALICIOUS

Office (OLE) / .XLS

80.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-16

MD5: a65a6efa6d431fd742f5e3215953916c SHA-1: b8dc1666be34a266830cdc72c44b673c36096f99 SHA-256: 8ddb5e80d11c3bd9a56dbaa9e2bcd926a9793a55b3969a518d0f2e09cd57b404

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristic OLE_XLM_DANGEROUS_FN indicates the presence of Excel 4.0 macros with dangerous functions like RUN. The Auto_Open macro is configured to execute, and the embedded URLs are highly suspicious, suggesting a downloader functionality. ClamAV detection further confirms this as Emotet, a known downloader family.

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-ea81817e7f807ab1-9952142-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ea81817e7f807ab1-9952142-0
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` `7ab5ef6689937532951c996fe211a2ac046a3dbc546728bfe725212729605929`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6790 bytes

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