Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 736ee17f187c4f39…

MALICIOUS

Office (OLE) / .XLS

235.5 KB Created: 2020-06-29 02:06:46 Authoring application: Microsoft Excel
MD5: 2e2c9f07f99791d6482e4839b95ec1ef SHA-1: ebf4b8097462d1fdbfdc395a563aa45f9aa2644c SHA-256: 736ee17f187c4f39f8eb34f1f762ef0acb5a692cd9031cb5d8d6dc63edbf844f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical finding. Heuristics indicate the use of dangerous formula APIs and a lure to enable macros. The macro script attempts to download a payload from the URL 'http://gsag.ecuritydlnomxbw'. This indicates a dropper functionality, likely delivered via spearphishing.

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: Xls.Dropper.Agent-8801722-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8801722-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c70534430c1e98c289cd32b41ec8fcd664c6f674f22b4c86b9346d086ea424c1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 135799 bytes

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