Emotet Office (OLE) / .XLS malware analysis — malicious · 8ae43e539ff97133

MALICIOUS

Office (OLE) / .XLS

60.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-14

MD5: d9f99ba3f382630c76eca8ff1fb65518 SHA-1: 5300ffc98d7339179f7fe9c9a8a098003f78dbf4 SHA-256: 8ae43e539ff9713326277c5a0ddb7b1221a8a54db7cd87571373c3533a322c44

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 spreadsheet containing an Auto_Open macro, which is a known technique for executing malicious code. The macro uses the RUN function to download a payload from one of the provided URLs. ClamAV detection confirms this is Emotet malware. The reconstructed URLs are: http://airhobi.com/system/gbh/, http://yesdeko.com/stats/xdlT/, http://akdalarabic.com/cgi-bin/lmqmGv5s/, and https://www.zonetuner.com/licenses/QC4rII7/.

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` `d77c0e98c974009fe5584bce5e0ffd72a8b15ac4e83c1240090b3dfbcca2aa7b`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8320 bytes

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