Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 7981d1a76489f00f…

MALICIOUS

Office (OLE) / .XLS

48.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-04-22
MD5: 7a823f96901623ca0ce09aee770e8702 SHA-1: 88c369927707b381566ba736c462c07eec9fb6b2 SHA-256: 7981d1a76489f00f506d4730f780712b96cc51853bef0555706004aaf9682658
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro is designed to download and execute a second-stage payload from one of the provided URLs. ClamAV detection further supports the malicious nature, identifying it as Emotet. The presence of an Auto_Open macro and the download URLs strongly indicate a spearphishing attachment used to deliver malware.

Heuristics 5

  • 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: Doc.Downloader.Emotet04222-9946685-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet04222-9946685-0
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://famesa.com.ar/dos/gaa/
    • http://ecoarch.com.tw/cgi-bin/vWW/
    • http://dharmacomunicacao.com.br/OLD/PjBkVBhUH/
    • https://www.fantasyclub.com.br/imgs/rggmVTfvT/
    • https://dp-flex.co.jp/cgi-bin/Bt3Ycq5Tix/
    • http://expresocba.com.ar/snnyNkcVAE3Ztitw/TT0h7/�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e6c89927dc7168d93d49466610b3ac5d92738cbbc93741776e09e2158e88b9b5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8124 bytes

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