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

Static analysis result for SHA-256 b6a9df8e42e2342f…

MALICIOUS

Office (OLE) / .XLSX

145.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5c3f07aee353b1d76578dc5cea14c8ef SHA-1: 58e15a96fb0cb0a55ffd95628d0989ac11e5e1e1 SHA-256: b6a9df8e42e2342fa86d93e8123c3e9210aee1d294da891cdb00a60c4865f2a3
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1036.005 Match Legitimate Name or Location

The sample is a macro-enabled Excel file containing a Workbook_Open macro that executes a Windows script host command. This command appears to download and execute a second-stage payload from several URLs, including 'http://reumatisclinic.com/-/scCnm3mbJRpBsKBbrC/'. The script also attempts to create scheduled tasks or run entries, potentially for persistence. The presence of 'CreateObject' and 'Wscript.Shell' calls, along with the ClamAV detection, strongly indicates malicious intent.

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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