Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 3d7dae39c614549e…

MALICIOUS

Office (OLE) / .XLS

47.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-04-22
MD5: 007a0b580a37ea63301802fda0892664 SHA-1: 8aca1bd1719e8792f451399270d0348a2cf9eb5b SHA-256: 3d7dae39c614549ee1d8f8e6907316cdf8bb2b7af9993aa23fe2582b68522833
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File Execution: Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that leverages the Auto_Open function to execute dangerous formula APIs. The embedded XLM macro sheet contains references to multiple URLs, indicating a downloader functionality. ClamAV detection as 'Doc.Downloader.Emotet04222-9946520-0' strongly suggests Emotet family involvement. The primary intent appears to be downloading and executing a second-stage payload from one of the listed URLs.

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.Emotet04222-9946520-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet04222-9946520-0
  • 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://eleselektromekanik.com/69Iq5Pwbd0/s/
    • http://demo34.ckg.hk/service/Atk7RQfUV673M/
    • http://dupot.cz/tvhost/DUnMUvwZOhQs/
    • https://demo.icn.com.np/stories/Qk/
    • https://bitmovil.mx/css/TrgyPiTXy3/
    • http://focanainternet.com.br/erros/DepAK3p1Y/�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
2670f09984c9f89e0c31dbfd71e019d5945a5ba86b2e4e522615b22d445dd7f0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8122 bytes

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