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

Static analysis result for SHA-256 338964c2adba45bc…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: d0e27645a7b6894fd6e215afb692d87f SHA-1: a4bd8a9c76f16f04dfd29712beb4dd4421f90aff SHA-256: 338964c2adba45bc44b22e257a19374b9626ba84a588763d2be0ed8939e5f6f4
280 Risk Score

Malware Insights

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

The sample contains a Workbook_Open VBA macro that utilizes Wscript.Shell to execute commands. The macro constructs and runs two commands: one to execute 'c:\programdata\yhjlswle.vbs' and another to execute 'c:\programdata\ughldskbhn.bat'. The DOC BODY also contains obfuscated commands and URLs, suggesting a downloader functionality. The presence of Wscript.Shell and the execution of external scripts indicate a malicious downloader attempting to fetch and run a second-stage payload.

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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