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

Static analysis result for SHA-256 a8c8b8d78454167e…

MALICIOUS

Office (OLE) / .XLS

24.0 KB Created: 2010-05-20 00:46:23 Authoring application: Microsoft Excel
MD5: 05413b8590f23318a9002922ea267d10 SHA-1: 681c37163a7a264e2e3d3444cd5bd0b6aff1e78c SHA-256: a8c8b8d78454167e61979e9a9680bd22e8fc077a7a1fafa7a853f8dbddc20c9a
180 Risk Score

Malware Insights

Xls.Trojan.Laroux-32 · confidence 95%

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

This XLS file contains a critical Auto_Open VBA macro, identified by ClamAV as Xls.Trojan.Laroux-32. The macro is designed to execute automatically upon opening the document, serving as the initial vector for infection. The presence of the Auto_Open macro strongly suggests an attempt to gain initial access to the system by tricking the user into opening a malicious attachment.

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
b0c438f98b5585ec7a1ece9d2de9b4520c10f0781b2157b821ed8ddca2a21702		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2205 bytes
Detection
ClamAV: Xls.Trojan.Laroux-32
Obfuscation or payload: unlikely

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