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

Static analysis result for SHA-256 8b0e04de8f458483…

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: ce5ba78ce1525e59aec3f64a315ee426 SHA-1: 305e9a195f5e565b463c406c7795fbcdd7f44c7e SHA-256: 8b0e04de8f4584836a281601ea7e26e4f480be667cfa1f10f68ca847796b240e
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro that executes code. The script utilizes CreateObject to interact with Wscript.Shell and Scripting.FileSystemObject, indicating an intent to download and execute further payloads. Reconstructed URLs from the script suggest potential download locations for second-stage malware. The presence of Wscript.Shell and FileSystemObject calls, along with the execution of a batch file and VBScript from ProgramData, points to a downloader or droppper functionality.

Heuristics 7

  • 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.
  • 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
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7821 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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