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

Static analysis result for SHA-256 4c6d88c6009a919f…

MALICIOUS

Office (OOXML) / .XLSM

125.4 KB Created: 2013-10-09 08:17:12 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5ecfff852f2c726feb29f6c32a632219 SHA-1: 137550d0af5fd1baee64bf430e0153794751ae2d SHA-256: 4c6d88c6009a919fbce43826f933642c487898411aa6c81eac931340f711c5e2
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment

This XLSM file contains a Workbook_Open macro that utilizes Shell() and CreateObject() to execute cmd.exe. The ClamAV heuristic identifies it as Xls.Dropper.Agent-1404879, indicating a dropper functionality. The presence of embedded VBA macros, specifically 'macros.bas' and 'vbaProject_00.bin', further supports this. The macro likely downloads and executes a second-stage payload, though the exact mechanism is truncated.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-1404879 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-1404879
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Hidden worksheet (veryHidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 2 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.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
02df927e64c8ef7c020fb5f7aa40d1febc899678f94c12ff18dc5db84ca9455c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5581 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
78fbfa9aca7c478622dfa05e5f1109fd39c5fee0b82d61a776f44560a58016e8		 vba-project OOXML VBA project: xl/vbaProject.bin 39424 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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