Valyria — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 5f5c2ede26d2d354…

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-20
MD5: ae5a7b57c75f211fdccffc36998cd600 SHA-1: 3d26fc60bca3f9bc4b9d52ca5ddffb77edb14bfb SHA-256: 5f5c2ede26d2d354f2f3edeb1c814bccd78ec6dd2bc74cca672a4b5b83069703
240 Risk Score

Malware Insights

Valyria · confidence 95%

MITRE ATT&CK
T1059.003 Windows Command Shell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The Workbook_Open macro executes a command that leverages cmd.exe to download a file from the URL 'https://transfer.sh/get/YTYTYSYp0DR/abxc.customercampaign' and save it as 'C:\Users\Public\ozrd2.exe'. This downloaded executable is then immediately executed. The ClamAV detection name 'Xls.Downloader.Valyria-10008445-0' strongly suggests the Valyria family.

Heuristics 6

  • ClamAV: Xls.Downloader.Valyria-10008445-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Valyria-10008445-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
64f8eea7595af451adea143aba575e0e40f60b3aabdf25ea66b4ea7846848bf2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1325 bytes

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