Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5fe93eb8a1c1b6c8…

MALICIOUS

Office (OLE)

311.5 KB Created: 2020-07-06 20:19:05 Authoring application: Microsoft Excel
MD5: 94bd48fc272ad26dde868fd45ab8f4c3 SHA-1: 3529dc999777a424bb9c973006b3f05fc880a351 SHA-256: 5fe93eb8a1c1b6c8caf283ef2d1b1a86516b93703298df2e7ab022719385c86d
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious activity. The macros utilize dangerous formula APIs and include environment evasion techniques, suggesting an attempt to execute a payload. ClamAV also detected the file as 'Xls.Dropper.Agent-8844418-0', further confirming its malicious nature as a dropper.

Heuristics 6

  • 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.
  • XLM Auto_Open environment-evasion close gate critical OLE_XLM_ENVIRONMENT_EVASION_CLOSE
    Excel 4.0 macro sheet auto-executes environment checks with GET.WORKSPACE / GET.WINDOW, then shows a fake corruption/error message and closes the workbook when the host fails those checks. This is a malware sandbox-evasion pattern, even when the later payload stage is hidden behind obfuscated defined-name flow.
  • ClamAV: Xls.Dropper.Agent-8844418-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8844418-0
  • 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.
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
81d517ef3ed5a623a99944f8a4385865fadc442a161fdbb85b0f8079c3f35dd4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 254592 bytes

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