Xls.Trojan.Laroux-32 — Office (OLE) / .EXE malware analysis

Static analysis result for SHA-256 a3d55d66dd10fd9e…

MALICIOUS

Office (OLE) / .EXE

227.5 KB Created: 1980-01-04 00:34:10 Authoring application: Microsoft Excel
MD5: 9bdc7d6926c4d4e9874bb7bfd9c0cd07 SHA-1: dfa91606f47cb550f6bcc3d6bd581f6c09343852 SHA-256: a3d55d66dd10fd9e136801a8bc6b7b24c38aa845bd49bcde23963d53cc7e0bd1
180 Risk Score

Malware Insights

Xls.Trojan.Laroux-32 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Trojan.Laroux-32. Static analysis revealed the presence of a VBA macros, specifically an Auto_Open macro, which is a common technique for initial execution in macro-enabled documents. The macro is likely responsible for downloading and executing a secondary payload, although the specific actions are not detailed in the provided evidence.

Heuristics 4

  • ClamAV: Xls.Trojan.Laroux-32 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-32
  • 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
38e641c50c3f11d9e2ee66e168657fdae76a3d87773aa23d222b50ba91ddcf9d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1906 bytes
Detection
ClamAV: Xls.Trojan.Laroux-32
Obfuscation or payload: unlikely

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