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

Static analysis result for SHA-256 cd36747b600df9db…

MALICIOUS

Office (OLE) / .MUS

53.5 KB Created: 2010-01-20 16:15:22 Authoring application: Microsoft Excel
MD5: 8e08db3419ae5b4c18d99732068e6005 SHA-1: b5630d26bbca0309b62ed36ef4ca5a289e7a2df2 SHA-256: cd36747b600df9dbefa344a7d5d2ab53660eacff4c34d34a3c68de8dfc017092
180 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros, specifically an Auto_Open macro, which is a common technique for initiating malicious actions upon opening. ClamAV detection as 'Xls.Trojan.Laroux-28' strongly indicates malicious intent. The presence of an Auto_Open macro suggests the document is designed to execute code automatically, likely to download and execute a secondary payload. No specific family could be identified, but the macro-based execution is a clear indicator of a trojan downloader.

Heuristics 5

  • ClamAV: Xls.Trojan.Laroux-28 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-28
  • 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
  • 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://www.apple.com/DTDs/PropertyList-1.0.dtd

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d7bf2f91b353bf5927efeaa76fe4f5c61a829bc6c713bdb600e6d42600339b8f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2334 bytes
Detection
ClamAV: Xls.Trojan.Laroux-28
Obfuscation or payload: unlikely

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