Emotet Office (OLE) / .XLS malware analysis — malicious · f77c3ea716a4328b

MALICIOUS

Office (OLE) / .XLS

95.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-07-13

MD5: 0cc7c9d7567aba0c1480e192bb1f542b SHA-1: 641b751f2324e2d350384cba326c36407e6e495c SHA-256: f77c3ea716a4328b6936b3f31faad5595fd6e19f2dc8e27bbab8965fa2cdcc68

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled spreadsheet detected as Emotet by ClamAV. It contains an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro uses dangerous formula APIs, indicating an intent to download and execute a secondary payload.

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` `85773188e79d904ef8ecf815a27f3a8200cc87e1822ab4901cc9bed29c53e636`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8156 bytes

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