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

Static analysis result for SHA-256 0d7d8a701d257459…

MALICIOUS

Office (OLE) / .XLS

110.0 KB Created: 2011-08-19 09:05:59 Authoring application: Microsoft Excel
MD5: 7d0a07eec64fbe5ce99e4a232e7010ac SHA-1: b30af48f2ba1e07f1ea1e900c3a7a71e8e00f9bb SHA-256: 0d7d8a701d2574597c9e2ec0ef007054c57f84f32a552d601ce47801e85cd1d1
200 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous formula APIs, indicating an attempt to execute arbitrary code. The document body prompts the user to 'Enable Editing' and 'Enable Content', a common social engineering tactic to bypass security warnings and execute the malicious macro. The ClamAV detection name 'Xls.Dropper.Agent-8229616-0' further confirms its malicious nature as a dropper.

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-8229616-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8229616-0
  • 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
555cfe382a7d7a143b46c668a9b5ad5c179e13ee9cbd4c7138b5bbc68b1a14c5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 59436 bytes

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