Xls.Trojan.Laroux-32 — Office (OOXML) malware analysis

Static analysis result for SHA-256 5bb6339518ba4477…

MALICIOUS

Office (OOXML)

201.1 KB Created: 2013-08-12 07:01:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-01-11
MD5: a1a23db0cbba4cb8f9eaa059a1332b67 SHA-1: b75d1ae1c2a5a730d06ed1102060ca530f98472e SHA-256: 5bb6339518ba4477ad3bef1d89fbf9e97c67ef5c1104e7418c35503f6ac8ef51
222 Risk Score

Malware Insights

Xls.Trojan.Laroux-32 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Trojan.Laroux-32. Static analysis revealed an embedded OLE object containing a VBA macro, which is a common technique for delivering malicious payloads. The document body content appears to be a legitimate internal company notice, but the embedded macro is the primary indicator of malicious intent.

Heuristics 5

  • ClamAV: Xls.Trojan.Laroux-32 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Laroux-32
  • Embedded Office object carries macros critical OFFICE_EMBEDDED_MACRO_OBJECT
    This document embeds a second Office file that itself contains a VBA macro project or an Excel 4.0 (XLM) macro sheet. Hiding a macro-bearing workbook or document inside another document — frequently under an obfuscated, non-standard part name — is a macro-smuggling technique that defeats scanners which only inspect the outer document's macro storage. No benign authoring workflow stages a hidden macro project this way.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in word/_rels/settings.xml.rels: Normal
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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://schemas.openxmlformats.org/markup-compatibility/2006 OOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/mathOOXML external relationship
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainOOXML external relationship
    • http://schemas.microsoft.com/office/word/2006/wordmlOOXML external relationship

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 542208 bytes
SHA-256: 3a15f35b1bcd3e81b09b353b7e5de68e3143f1e6e1f1c8d1d5d59ace22544b59
Detection
ClamAV: Xls.Trojan.Laroux-32
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5444 bytes
SHA-256: 8d40ccc7468a13086d23a95ecb15bda38a579e0e608616e760446c8cb7770cc9

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