Xls.Dropper.Agent-8933908-0 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 87fc4f4ae226d335…

MALICIOUS

Office (OOXML) / .XLSM

408.0 KB Authoring application: Microsoft Excel 16.0300
MD5: 09a8cbe6d4fdea66a35f58c30c61501f SHA-1: da2b66d7c1ef3e143b72d58f1bc9f462c6d787ac SHA-256: 87fc4f4ae226d335bf7a40c60b6c246f98b5aea94635b89d9b56edb50e981925
260 Risk Score

Malware Insights

Xls.Dropper.Agent-8933908-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is an XLSM document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. ClamAV signatures identify it as 'Xls.Dropper.Agent-8933908-0', a dropper agent. The presence of a VBA project and the Workbook_Open heuristic strongly indicate that the macro is intended to download and execute a secondary payload. No specific URLs or further script details were extracted to refine the analysis.

Heuristics 7

  • ClamAV: Xls.Dropper.Agent-8933908-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8933908-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • 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
b68211e4e166290585eee096df4216d1e2906cef324dd77ec6b003512227c13c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3757 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
087f3f6d0610f2b629ff3f69f5bcdf1321ebefa3999f06dbcea251098c1f8a0c		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.Agent-8933908-0
Obfuscation or payload: unlikely

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