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

Static analysis result for SHA-256 fd026921becc891d…

MALICIOUS

Office (OLE) / .XLSX

81.5 KB Created: 2020-05-20 08:20:55 Authoring application: Microsoft Excel
MD5: 78090b4fd8393d069883f1a9f837102c SHA-1: 5c0024403e1a95feda90d252e330b49149e8a596 SHA-256: fd026921becc891d242457b17c385aea5c9ed2509e25f0714abbb00a64f40946
200 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macros utilize dangerous formula APIs, including RUN, indicating an attempt to execute external code. The presence of a URL within the macro sheet suggests it is designed to download and execute a second-stage payload, consistent with dropper malware. ClamAV also detected this file as Xls.Dropper.Agent-8001684-0.

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.Dropper.Agent-8001684-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8001684-0
  • 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
0a6b4709731946fbf0519f5dc942872f7893ae6d79bfd6623a05bf42300272c2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 53962 bytes

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