Xls.Downloader.GreenEnable06210-9869360-0 — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 e38b65ee7924ff0b…

MALICIOUS

Office (OOXML) / .XLSX

430.3 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9ba2da0943a9460023eb9606e2eaf29e SHA-1: 884918794a57f3bf59ad1b0c31e000d7c5a5bec8 SHA-256: e38b65ee7924ff0bdda8f4e9b282c55c89de1435a36b653d7506818afcda8be0
410 Risk Score

Malware Insights

Xls.Downloader.GreenEnable06210-9869360-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

This Excel 4.0 macro-enabled document utilizes dangerous functions like EXEC and GOTO, indicative of a downloader. The presence of VirtualAlloc, VirtualProtect, LoadLibrary, and GetProcAddress API calls suggests the execution of shellcode or a dropped payload. The ClamAV signature 'Xls.Downloader.GreenEnable06210-9869360-0' further confirms its malicious nature as a downloader.

Heuristics 11

  • 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.
  • 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: GOTO, EXEC, HALT 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.
  • ClamAV: Xls.Downloader.GreenEnable06210-9869360-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.GreenEnable06210-9869360-0
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 4 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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    URL http://schemas.openxmlformats.org/spreadsheetml/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/excel/2006/main
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
3b0842c3feb9ed67b33a34a48dfc280d3096f5a2c314be3f5faf78e2baa667ed		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1648 bytes
xlm_sheet_01.xml
7d4a55654500227df147871fd9677ba5c24aa7c22083d410272b3fc52dfde2a3		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1804 bytes
xlm_sheet_02.xml
83e3d47a6c45235934593bf9c8e8c38200b3b0117516d839726b31aeac579c0f		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 2260 bytes

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