Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 17c5e789d5bfb084…

MALICIOUS

Office (OLE) / .XLS

53.5 KB Created: 1997-01-14 01:50:29 Authoring application: Microsoft Excel
MD5: 6d48df762bb46886922192f09fe63427 SHA-1: c490f568a7007160abee1ebf6c80e0e4662f50b1 SHA-256: 17c5e789d5bfb0841204b3815dc3686900b00a1b9c63f38e6757c2b741c70f6f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file is an Excel spreadsheet containing a VBA macro with an Auto_Open subroutine. This macro attempts to copy itself to the Excel startup directory as 'StartUp.xls' to achieve persistence. It also sets up application event handlers to maintain its presence. The ClamAV detection and the presence of Auto_Open macro strongly indicate malicious intent.

Heuristics 4

  • ClamAV: Xls.Trojan.Escape-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Escape-2
  • 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.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df0db2b736b6c198afb0d1338be15f877e7b5ce9ad88e18698ac06d145dfcb65		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1988 bytes
Detection
ClamAV: Xls.Trojan.Escape-1
Obfuscation or payload: unlikely

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