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

Static analysis result for SHA-256 fa68e63e126eb0d2…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: b2c1f91f12009f55300d141903c7a5ea SHA-1: dba3a11fdb41ffdb9836f1e8f7dc815304fec02a SHA-256: fa68e63e126eb0d27aaef2aaeda6b81f29c7072788f6c282e852948f87691809
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common technique for initial execution. The script attempts to download and execute a second-stage payload using a reconstructed URL: "http://santoetortilala.com/_baks/tUX9/http://donbaham.com/Home_files/YS0PAaPyeraes/,http://barnhart-studies.com/eln-images/vggh1nb/ ,http://blute.com/3dtech/jLu8IAnnj3gK9WC/,http://zenzebra.net/plath/9Q0DBle/,http://reacorp.net/PhotoGallery/UwRHcSeGbaCeGF/,http://miniflam.com/eln-images/fSwbQjU M AfGxdw/,http://marezdecor.com/MarezGallery/sEQxWtpMJ7A8rAtY/". This indicates an Ingress Tool Transfer attack pattern. The presence of Wscript.Shell and CreateObject calls further supports the execution of external commands or scripts.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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