Office (OOXML) / .XLSM malware analysis — malicious · 533c8713c4e10c22

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: a8b4e37766d35b543884d8882147eaa2 SHA-1: 4356c14118ea9098dabb6d9af620003b7929058a SHA-256: 533c8713c4e10c223a9f8139f9d408ca326aee14a1d88382c91f2ff18cf0f93c

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

This Excel macro-enabled document (XLSM) contains critical Excel 4.0 macros that utilize dangerous functions like FORMULA, HALT, GOTO, REGISTER, and EXEC. These functions are capable of directly calling Win32 APIs, enabling the download and execution of a second-stage payload from the provided URLs. The presence of an Auto_Open macro further indicates that the malicious code is designed to execute automatically upon opening the document. The document body also contains references to URLs that are likely used for payload delivery.

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: FORMULA, 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://185.45.193.80/44313,6048108796.dat
- http://82.118.21.70/44313,6048108796.dat
- http://45.144.31.232/44313,6048108796.dat
- http://185.45.193.80/
- http://82.118.21.70/
- http://45.144.31.232/
- 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` `336c54ce55c4f97b2e578c36c24779a5cbf4053bf1babc3f97ec244f65df85ae`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1451 bytes
`vbaProject_00.bin` `fd66c192343c5417fd652cf06eb25c1c94f77422491ceeb13938b68483d9178d`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 bytes
`xlm_sheet_00.xml` `70da6d0347c5eb950708e32f28433a445cdbeb1ffd96ec2bad7f8e28050f1815`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	3816 bytes
`xlm_sheet_01.xml` `195a22194deb18d457e7a276044a8954c5a468f56b51b6a1ff34e52b2b6585ae`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	2129 bytes
`xlm_sheet_02.xml` `790f162dfe4d36146f6098416bb54d0d0a33d67d88c8fea35d57cce261bdd8f0`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	1943 bytes

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