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

Static analysis result for SHA-256 05454343e6452cbd…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:47:19 Authoring application: Microsoft Excel
MD5: 24ee4686c4b571e169c247dc366f34a1 SHA-1: 51390c2c358364e11a0c7198d6bea2999166269d SHA-256: 05454343e6452cbd4aa80cdd29dacb60b697f57f47a1c78cf120537a91bcdc44
140 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 finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload. No specific family could be identified from the available evidence.

Heuristics 3

  • 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.
  • 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
554eb06214c2b75a5019de523a2fb321f9634012429009788996db4c3a3284b5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6720 bytes

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