Xls.Trojan.Kilo-1 — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 32d62f77884faffb…

MALICIOUS

Office (OLE) / .XLSX

25.0 KB Created: 2003-12-08 10:49:11 Authoring application: Microsoft Excel
MD5: 6d41dc1deca991ee33b060c2347e669d SHA-1: 434591a0e54189cdf5ca002fb93f56dd9302d926 SHA-256: 32d62f77884faffb4b8fe5e24202344821605fb820c475167f83642f203a32c5
180 Risk Score

Malware Insights

Xls.Trojan.Kilo-1 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV detection and the presence of a VBA macro with an Auto_Open subroutine strongly indicate malicious intent. The script attempts to copy itself into the user's PERSONAL.XLS file, which is a common technique for establishing persistence within Microsoft Excel. This allows the macro to be available for execution in any workbook opened by the user.

Heuristics 4

  • ClamAV: Xls.Trojan.Kilo-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Kilo-1
  • 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
b31c56370cdbeff759fae1b170ad9fb772c923a37b7acaaa861f7ebc03ef25ec		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7519 bytes
Detection
ClamAV: Xls.Trojan.Kilo-1
Obfuscation or payload: unlikely

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