Xls.Downloader.Valyria-10008445-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 d77795d4563d03c0…

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-09-18
MD5: c678822324d3db11afb66ad4dc9a5bb8 SHA-1: db82a3d3de0b0d90cc302e903e18dd9d2fb684c4 SHA-256: d77795d4563d03c0ec79533ac468580fa94ae26a54b5e14e34c3d6bdf9ae51b0
240 Risk Score

Malware Insights

Xls.Downloader.Valyria-10008445-0 · confidence 95%

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute a command that downloads a file named 'happy.exe' from 'https://transfer.sh/get/SkazYLa2BT/happy.exe' to 'C:\Users\Public\pxpr0.exe' and then executes it. This indicates a downloader functionality, aiming to fetch and run a second-stage payload. The ClamAV detection name 'Xls.Downloader.Valyria-10008445-0' further supports this assessment.

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
56ea2dd4c5a94847ee6a2d30c78a0cf3a2e217051201d478c819bd928f680326		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1182 bytes

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