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

Static analysis result for SHA-256 746bd495f88dc532…

MALICIOUS

Office (OLE) / .XLS

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7ba41497a1faaa289543ca77b6c4aa12 SHA-1: 76f8df0e8fbb699f1352bbfd90b67743f660b016 SHA-256: 746bd495f88dc532f48b22577e8f279b1d471a3205d781f7456ed589269600a0
302 Risk Score

Malware Insights

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

The sample contains VBA macros that trigger on workbook open, indicative of malicious intent. The macros reconstruct and attempt to download payloads from multiple URLs, as evidenced by the OLE_VBA_CELL_DROPPER_URL heuristic and the embedded URLs. The presence of Wscript.Shell and CreateObject calls further suggests execution of downloaded content.

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.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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://sesco-ks.com/wp-content/DJkMVMU6cBr45/
    • https://sangwin.in/magnisapiente/UzYqb1lvgq/
    • http://actividades.laforetlanguages.com/wp-admin/OfFq/
    • http://sbcopylive.com.br/wp-admin/hvAXqZc4DyKBzDZO/
    • http://sep.dfwsolar.club/hzh3v/poAgyopszuh6a1EIG/
    • http://b-lubisi-motivational-speaker.com/wp-admin/Wf5rQabNRai/
    • http://mytelefonist.de/wp-content/bLm8fxV2M/
    • https://www.yeald.finance/wp-content/uploads/jqAorV83quhL23HMg/
    • http://tattooblog.cn/wp-includes/7AvyW/
    • http://docs-construction.com/wp-admin/jDDqg/
    • https://pmfstukm.com/wp-admin/SoenE35FXJBjVdnfME/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d6216b1540c6d866e0cdc66ed3bfa2b79b477655c56d42a698e7b407351a97e3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6560 bytes

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