Office (OOXML) / .XLSX malware analysis — malicious · 5838ab6eb18f97c3

MALICIOUS

Office (OOXML) / .XLSX

84.8 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: 19be87d6c31911e77d1e3b39d2a542c7 SHA-1: cf7a81250c8ff76704e46d68583c6245c9a48801 SHA-256: 5838ab6eb18f97c3b9a998476d74ede9a8e0afc790fd9243f7c8ac5b59493e43

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1082 System Information Discovery

This sample contains an embedded XLM macro that attempts to access a potentially harmful RTF document located at 'C:\ProgramData\fnsfunsgrgngkjfsgrnd@.rtf'. The use of this path suggests an attempt to leverage system information or manipulate it, aligning with techniques like Command and Scripting Interpreter and System Information Discovery. However, due to obfuscation in the extracted scripts, specific actions cannot be confidently determined beyond these general intentions.

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` `06b862fda0b62be5dd5c5e870691c29a1009634a0aac49569e3a495a8f94af80`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4714 bytes

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