Office (OOXML) / .XLSX malware analysis — malicious · 24d0d19cfa859abb

MALICIOUS

Office (OOXML) / .XLSX

110.4 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: 0c69a7ab4a9263c4074bae95fecfea77 SHA-1: ed38d924f1db513b4d2dcc39e4214a9893846b40 SHA-256: 24d0d19cfa859abbd1403071aefcf581d104f575973a5a6dbb14123c8e2e453b

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.005 Visual Basic for Applications T1059.005 Visual Basic for Applications T1059.005 Visual Basic for Applications T1059.005 Visual Basic for Applications T1059.005 Visual Basic for Applications

This XLSX file contains Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like CALL and EXEC to download a payload from one of the provided URLs. The presence of an Auto_Open macro further indicates malicious intent, as it automatically executes upon opening the document. The hidden worksheets are likely used to conceal the macro code.

Heuristics 6

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.
Dangerous XLM formula APIs: HALT, GOTO, REGISTER, EXEC 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.
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 3 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 http://185.45.193.74/44313,6048108796.dat
- http://195.123.220.175/44313,6048108796.dat
- http://45.144.29.253/44313,6048108796.dat
- http://185.45.193.74/
- http://195.123.220.175/
- http://45.144.29.253/
- 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `75218b3f0bb17eeec5572784caf45beb820d0c1786c79b4827590e90358f3168`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	796 bytes
`vbaProject_00.bin` `f94c515c15a2369b46850e056a403c6ee0151dcf0eaaee0fd438d3a90bd5464f`	vba-project	OOXML VBA project: xl/vbaProject.bin	13824 bytes
`xlm_sheet_00.xml` `3b11ac276e03e0a75147eb42f7fa8acafe7bfdb28b0154bb5f4e04a17633ef7a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	4291 bytes
`xlm_sheet_01.xml` `a5fc80b1569128bd0323daacf4b0484b147d9d37755aacc26435ea011bd9f0cd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	2111 bytes
`xlm_sheet_02.xml` `a6c079d2a564b952bdc7f60d49402489a374e91f07f8b51ef328523d2a650900`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	1944 bytes

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