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

Static analysis result for SHA-256 10842ffd55c76b4f…

MALICIOUS

Office (OLE) / .XLS

29.0 KB Created: 2010-05-21 06:21:27 Authoring application: Microsoft Excel
MD5: fb30771bfb5d716a8f776aa090a3a217 SHA-1: 62aa97a775150a503a09764a8d10645a2fc28bc6 SHA-256: 10842ffd55c76b4f1be9de59015e4000b2f7d7ecf7b26e0a78af92ed4871fcfc
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 VBA macros, specifically an Auto_Open macro. This macro attempts to copy itself to the Excel startup directory as 'StartUp.xls', thereby establishing persistence. The presence of Auto_Open and the copying behavior strongly suggest a malicious intent to maintain execution on the compromised system.

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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