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

Static analysis result for SHA-256 b8ba93b3d0308e5a…

MALICIOUS

Office (OOXML) / .XLSM

112.1 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: d33f0a4d1eb9edfbeeae30288fb7d9ba SHA-1: 719352b8c28b7e6fe44a36d3c03315bf8c55492d SHA-256: b8ba93b3d0308e5ab136d3067d18affb40b9ea582aa753da3429677d45dd2d69
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1105 Ingress Tool Transfer

This Excel macro-enabled document (XLSM) contains critical Excel 4.0 macros that utilize dangerous functions like FORMULA and EXEC. These functions are capable of directly calling Win32 APIs to download and execute payloads. The embedded URLs point to suspicious IP addresses that likely host the second-stage payload. The presence of an Auto_Open macro further indicates malicious intent, as it automatically executes upon opening the document.

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://2.56.244.189/44313,6048108796.dat
    • http://51.254.164.244/44313,6048108796.dat
    • http://190.14.37.36/44313,6048108796.dat
    • http://2.56.244.189/
    • http://190.14.37.36/
    • http://51.254.164.244/
    • 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.

FilenameKindSourceSize
macros.bas
336c54ce55c4f97b2e578c36c24779a5cbf4053bf1babc3f97ec244f65df85ae		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1451 bytes
vbaProject_00.bin
55add589d911bf92678dc48c8e8c0be1cdadf2db4eeb434c96e8acd620b130ca		 vba-project OOXML VBA project: xl/vbaProject.bin 16384 bytes
xlm_sheet_00.xml
64e724613850f858063c18423d9e364ac4664c4d306d77d2b8755ced2240473a		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 3795 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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