Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 bf6f906e69a4245f…

MALICIOUS

Office (OLE) / .XLS

101.5 KB Created: 2022-04-01 07:14:19 Authoring application: Microsoft Excel First seen: 2022-04-04
MD5: 63afa97abf8c429c99a5720fe3877012 SHA-1: feda3bf501d3cce7a512cdde05a99ec938db1c38 SHA-256: bf6f906e69a4245fa12be92220db6bb8a9c5aa34026a8920aa5e29ce3d6adc60
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled spreadsheet detected as Emotet. The XLM macros contain concatenated strings that reconstruct the URL 'http://facts-jo.com/init/jLQY2FpesnIGi0qHqz/' and the executable 'regsvr32.exe'. The Auto_Open macro is configured to download and execute a payload from this URL, which is characteristic of Emotet's downloader functionality.

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-b2cbc93e36c0c13e-9950560-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-b2cbc93e36c0c13e-9950560-0
  • 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.

FilenameKindSourceSize
xlm_macros.txt
8a188f103ec2ad9c430bbffc369798c3a872a3049e785c27c270542470084682		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7321 bytes

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