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

Static analysis result for SHA-256 66d9940e3da8e82c…

MALICIOUS

Office (OLE) / .XLS

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 437ae6a1f0e32f57c0816fd644938a00 SHA-1: c9a83e9b7716c1cd37542d7da8691f4e31ddc68f SHA-256: 66d9940e3da8e82ca21997cddcc300cdb7b6947a08c0506354ee7070202f673e
302 Risk Score

Malware Insights

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

The sample is an Excel file containing a Workbook_Open VBA macro that is configured to execute malicious code. The macro utilizes CreateObject to interact with the system and attempts to download and execute payloads from multiple URLs. Specifically, it reconstructs a command line that includes a base64 encoded string which decodes to a list of URLs, indicating an attempt to fetch and run a second-stage payload. The presence of Wscript.Shell and Scripting.FileSystemObject confirms the intent to execute scripts and manipulate files on the system.

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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