Office (OOXML) / .XLSX malware analysis — malicious · 439712110aaf2643

MALICIOUS

Office (OOXML) / .XLSX

78.8 KB Created: 2021-03-16 13:14:06 UTC Authoring application: Microsoft Excel 16.0300

MD5: ec3345208e73565e62a859f28f41d9b9 SHA-1: e49a80c369d0a5abf446c635ad4791ca5f4d6109 SHA-256: 439712110aaf264375b5e26584861c546094d64279757bce85b0a20e2cc2c500

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Service Execution: Service Execution T1204.002 Malicious File: Malicious File

The critical heuristic firing indicates the presence of Excel 4.0 macros. The macro code reconstructs a URL 'http://sported.xyz/camp/g/g.4gf.dll' and appears to be designed to download and execute a secondary payload. The macro commands 'open' and 'execute' further support this malicious intent.

Heuristics 1

Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET

Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `e80f0730e5b6f5cc43b8b09bc35236a910629807718515a5a342f9c4692b0dbc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	2544 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.