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

Static analysis result for SHA-256 2666fa420afeb7e3…

MALICIOUS

Office (OLE) / .XLS

198.5 KB Created: 2010-08-02 07:01:17 Authoring application: Microsoft Excel
MD5: 627b34d4ed03be93668e175aee4bed64 SHA-1: 64449e2608474d25f57bfbccb7a3bc799adb2248 SHA-256: 2666fa420afeb7e3e87aa3ede24da1f6de677646cecbeeedf883add15dd895a2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing VBA macros, with a critical heuristic indicating the presence of an Auto_Open macro. ClamAV detections for 'Xls.Trojan.Escape-2' and 'Xls.Trojan.Escape-1' strongly suggest malicious intent. The Auto_Open macro is designed to execute automatically upon opening the document, likely to download and execute a second-stage payload.

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
b1dc6e799f600e1fe03c12ee5c927d9c20e72385747b65f9e697c96da1cbf849		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1767 bytes
Detection
ClamAV: Xls.Trojan.Escape-1
Obfuscation or payload: unlikely

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