Office (OOXML) malware analysis — malicious · 0846910f2f2c0c68

MALICIOUS

Office (OOXML)

84.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: afdd3ac1e245c015cd6703ac38f6cc06 SHA-1: 6c5daf1541d2b05f5d6c99c2bc5a9bcff23688cf SHA-256: 0846910f2f2c0c686afab342cbb79965a115b35e41a0381819a0d10461d45c77

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample contains multiple Excel 4.0 macro sheets that utilize dangerous API calls like FORMULA to download and execute a DLL. Specifically, the macros attempt to download a file from 'http://162.248.225.89/m1.' and save it as '..\odndmfd.dll', which is then likely executed using 'regsvr32'. This indicates a downloader or droppper functionality.

Heuristics 5

Excel 4.0 macro sheet (6 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.
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://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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `52795b1cc75be876744588234808a1d91927c10145e153bd4f6945243f473e63`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	1645 bytes
`xlm_sheet_01.xml` `a83b22ff35bad4dc301cb7e72103b7d355b2c69141f09fbe6a8897a833702b4b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1431 bytes
`xlm_sheet_02.xml` `42c5f398c7afa7a09aba4313da99a81244208c8928de8f56669a07e0825dd31f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	1319 bytes
`xlm_sheet_03.xml` `a48e14b490a62788dd50d5a5d9dee0e5904de6f63e56d91e46c8043cfb642875`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1383 bytes
`xlm_sheet_04.xml` `7645c0c77e33a5b5d6d26f7019150357234094fec245de0440828342817acd06`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1606 bytes
`xlm_sheet_05.xml` `44174b0505e68836af700ee34080627ef7005b646a96c52fd238b5a795a93922`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml	1699 bytes

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