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

Static analysis result for SHA-256 279bec9f22d9bbfe…

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a3514b1b03ff9a31d6a0a74632bdbb6f SHA-1: e4b0736237e406f65a5756ea0acd013c2b8fde32 SHA-256: 279bec9f22d9bbfe1d16d96e306adc6aa94b57fa24a65badcf7ccfca65a25dc1
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The sample contains a Workbook_Open VBA macro that leverages Wscript.Shell to execute obfuscated commands. The script attempts to create and execute a batch file ('c:\programdata\jledshf.bat') and a VBScript ('c:\programdata\sduoixo.vbs'). The obfuscated command string within the DOC BODY contains multiple URLs, suggesting a downloader or initial access mechanism. The presence of 'CreateObject' and 'Wscript.Shell' firings strongly indicates the execution of malicious scripts.

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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