Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 18b2d1c0dd5c58b2…

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a56d2187eb3eb09e06de6f5be91de721 SHA-1: 33c66c356f2338875d950613eec0d0815db5e0ed SHA-256: 18b2d1c0dd5c58b2305a9e990a9e6efec7cc25f916cda172acc8ccc286d213ab
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros that are triggered by the Workbook_Open event. These macros utilize CreateObject to interact with the system, specifically referencing Wscript.Shell and Scripting.FileSystemObject. The primary function of the macro appears to be downloading and executing a second-stage payload from a list of 11 embedded URLs, including 'http://goyaluat.vmesh.in/0v6kcny/CG/'. The macro also attempts to create a batch file 'c:\programdata\jledshf.bat' and a VBScript file 'c:\programdata\sduoixo.vbs', indicating a downloader or dropper functionality.

Heuristics 8

  • URL reconstructed from VBA cell-staged base64 dropper (11 URLs) critical OLE_VBA_CELL_DROPPER_URL
    VBA reads worksheet cells, strips junk substrings via Replace(), and base64/UTF-16 decodes the result into a PowerShell EncodedCommand payload. The download URL is never contiguous in the file bytes; it was recovered by removing the macro's Replace() junk tokens from the cell strings and decoding the staged base64.
  • ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • 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://goyaluat.vmesh.in/0v6kcny/CG/
    • https://mars.srl/wp-admin/7Ffk6LLN2Xs2W/
    • http://franmulero.es/mbx/8c5RBJx6/
    • http://varafood.com/Ajax/cnM91G/
    • https://7jcat.com/wp-content/t/
    • http://blog.centralhome.h
    • http://zimrights.co.zw/oldsite/k0EoCWycU9tNo1d/
    • https://mudhands.com/error/BfH/
    • http://albatrospatagonia.com/phkcvt/t53ceSMDqgPQlq/
    • http://mapcommunications.co.zw/wp-admin/mdRRbSdU3aB7Xpx6z/
    • http://dushkin.net/img/bhQSTNicEMtNQxP/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7821 bytes

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