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

Static analysis result for SHA-256 70dc850a193ca8be…

MALICIOUS

Office (OLE) / .XLS

52.5 KB Created: 2009-12-29 20:58:29 Authoring application: Microsoft Excel
MD5: 0aabdb34b7c20c7a8175b21b88a5b0f8 SHA-1: bdb358faa8f5897abcb3f7a8bb3f6c9f7256b61c SHA-256: 70dc850a193ca8be9625029f7328433ddbbb0ed9c8a4dcfe852ccb608b7039b6
242 Risk Score

Malware Insights

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

The file is an Excel XLS document containing VBA macros, specifically identified as the Laroux-CV macro-virus. The 'auto_open' subroutine triggers the 'check_files' function, which attempts to copy the macro to the startup directory as 'PLDT.XLS', indicating an attempt to establish persistence. The VBA script is heavily obfuscated but the core functionality of self-replication and persistence is discernible.

Heuristics 6

  • Excel 5 Laroux/Larou-CV macro-virus marker cluster critical OLE_XLS5_LAROUX_MACRO_VIRUS
    Legacy Excel workbook contains a Laroux/Larou-CV macro-virus marker cluster including auto_open execution and workbook/module replication strings. This is a narrow indicator for an infected legacy Excel macro workbook.
  • 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
1ab6eecef12ad4852e62fbd2aaaacd824258ad494f2943ad3bc657703635aee5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2028 bytes
Detection
ClamAV: Xls.Trojan.Laroux-28
Obfuscation or payload: unlikely

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