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

Static analysis result for SHA-256 a93f870ec5baff88…

MALICIOUS

Office (OLE) / .XLS

69.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 9c500aed213cf9693c7e93a94e4c4b12 SHA-1: 955c61d7f667fcc01780be2124eace8988f423a4 SHA-256: a93f870ec5baff88edb4a49b7e1166c6b604c152ab6a49b232ddfa0eaa371886
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell

The sample is an XLS file containing VBA macros, with a Workbook_Open auto-exec macro. The critical heuristic OLE_VBA_SHELL indicates a Shell() call within the VBA, and OLE_VBA_WSCRIPT confirms WScript.Shell usage. The document body displays a message in Spanish prompting the user to 'Enable' the content, which is a common social engineering tactic to bypass macro security. The script likely downloads and executes a second-stage payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
d39c44b4b5158bf917757597e3082e8eb3ea0ad5680ea237669866fac1a6b814		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 24748 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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