Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 a499336111b0f782…

MALICIOUS

Office (OOXML) / .XLSM

37.3 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-07
MD5: ac39492daaf956096c6829d3fb34b34b SHA-1: 32368e45cc73540de561f00aec8c7c2cb8c4c39a SHA-256: a499336111b0f782e34549af035eed2a138cd50dd123463aaf9dd3310f3e4f6d
110 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1218.010 System Binary Proxy Execution: Regsvr32 T1059.001 Command and Scripting Interpreter: PowerShell

The file is detected as Emotet by ClamAV. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the use of 'regsvr32.exe' to execute commands from embedded URLs. The document body explicitly shows 'regsvr32.exe /s SysWow64\' followed by multiple URLs, suggesting it's designed to download and execute a second-stage payload from one of these locations. The presence of hidden sheets also supports the concealment of malicious content.

Heuristics 4

  • ClamAV: Xls.Downloader.Emotet03220-9940731-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet03220-9940731-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 2 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://queaventurasathya.com/licenses/r903sDTMHYLyn8ykMU/
    • https://axial-ing.fr/old/98WgLPFy5u2Xf/
    • https://escuelageneraljosedesanmartin.com/tmp/5vJR7J/
    • https://luape.es/wp-admin/moJpURVz/
    • https://indianbusinessclub.org/wtzrlyx/Nfisb7Le5JH/
    • https://cartelac.pt/wp-includes/VJMcayYWquGgVAGa/
    • https://queaventurasathya.com/li

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