Emotet Office (OLE) / .XLS malware analysis — malicious · adea96e307435ef9

MALICIOUS

Office (OLE) / .XLS

70.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-04-22

MD5: b444492928c79557b21700e2f8c70110 SHA-1: 1f4b0c0e4aba73e1202ab70416603d081c07fcae SHA-256: adea96e307435ef9c8447510b997d7974199e7ec8857dd5b94b2158d4d7f3955

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is an Excel 4.0 macro sheet containing an Auto_Open macro, which is a known technique for executing malicious code. The macro uses dangerous formula APIs, including RUN, to download and execute a payload from multiple URLs. The ClamAV detection explicitly names 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-b3c5cc3b13c03bcc-9950246-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-b3c5cc3b13c03bcc-9950246-0
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` `30ada183749f97ebaf18ae6bd28860c0d00794baffcbe6164f1acabbc23f484b`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6769 bytes

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