Office (OOXML) / .XLSM malware analysis — malicious · 34ba27e666b5a4f5

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: 2a3aed4aed788a1b1940529799e033aa SHA-1: c108d141858aa977fa5c59f30acfd4551c919fef SHA-256: 34ba27e666b5a4f5ec9cca1f65e24057822f9195503475e9dc0a9f4129674c37

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 Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like FORMULA and EXEC to download and execute a payload from the provided URLs. The presence of an Auto_Open macro indicates that the malicious code will execute automatically upon opening the document. The embedded URLs are highly suspicious and likely serve as the distribution points for the second-stage malware.

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://185.82.219.131/44313,6048108796.dat
- http://45.84.1.195/44313,6048108796.dat
- http://185.238.0.40/44313,6048108796.dat
- http://185.238.0.40/
- http://45.84.1.195/
- http://185.82.219.131/
- 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` `82f147ef4622124b990fa97fb82d52ce21a1a719f45158e458ccdd0608e1339c`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 bytes
`xlm_sheet_00.xml` `7bda064f9dd7461df3562edd896d831d9cbcce6b3896f4ceedf5c0e558bfe6d1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	3807 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

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