Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 57b99fc8a6b93bda…

MALICIOUS

Office (OLE) / .XLS

229.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: b5a6a69fff90a9cd84015cd16460f949 SHA-1: 5fe44fd619fb82fba6eb341de290063cfc7af788 SHA-256: 57b99fc8a6b93bda0bb101abef224504b26db8b2e4884aa7a83c94e2e1005755
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous formula APIs. The macros reconstruct and execute URLs to download a second-stage payload. ClamAV detection confirms this behavior, identifying it as Xls.Downloader.Emotet. The reconstructed URLs are: https://pvplglobal.com/G3Sc73WpcSo5/211021.gif, https://ivyfashion.in/9EzVsRwPKml/211021.gif, and https://m2autopartsindia.com/Ho2EjThhAmw/211021.gif.

Heuristics 6

  • 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.
  • URL reconstructed from XLM cell array (3 URLs) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • ClamAV: Xls.Downloader.Emotet-MSOLE2-af43432fbcb8603c-9980047-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-MSOLE2-af43432fbcb8603c-9980047-0
  • 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://pvplglobal.com/G3Sc73WpcSo5/211021.gif
    • https://ivyfashion.in/9EzVsRwPKml/211021.gif
    • https://m2autopartsindia.com/Ho2EjThhAmw/211021.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3da0d9813b47f00eb907c60ebde00ad0aa62499521c60e811eb27eb62be73fd0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 10823 bytes

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