Xls.Trojan.Clonar-1 — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 29bcc53f217b4679…

MALICIOUS

Office (OLE) / .XLSX

42.5 KB Authoring application: Microsoft Excel
MD5: 55d0561d0b9f1affb6f36163d179b643 SHA-1: bc187762ed16ea466f03b1d62b1845eeeb51666f SHA-256: 29bcc53f217b467995fe92cc9bd22ebddec172a8e496814376f81a119e13b5dd
180 Risk Score

Malware Insights

Xls.Trojan.Clonar-1 · confidence 95%

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate or Obfuscate Malicious Files or Information

The file is an Excel spreadsheet containing VBA macros, specifically an Auto_Open macro, which is a common technique for executing malicious code upon opening. ClamAV signatures identify it as Xls.Trojan.Clonar-1. The macro code itself is heavily obfuscated, preventing a detailed analysis of its specific actions, but the presence of an Auto_Open macro and the ClamAV detection strongly indicate it's designed to download and execute a second-stage payload.

Heuristics 4

  • ClamAV: Xls.Trojan.Clonar-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Clonar-1
  • 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
933e6f84e4a8fe4fb5e7ec4374f192fe0af798dd9c043ef542e22328b86ad62a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5605 bytes
Detection
ClamAV: Xls.Trojan.Clonar-1
Obfuscation or payload: unlikely

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