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

Static analysis result for SHA-256 3b8b9b8459bda34f…

MALICIOUS

Office (OLE) / .XLS

60.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 93c5e2f68e1fedae58473906f595477e SHA-1: 3f4cf5aa1388e64fa05360fbb45fa0aac7a1787c SHA-256: 3b8b9b8459bda34fd11c872741cd3ff5cdfae7290360a4fd025d65f5ec19cbb8
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros. The Workbook_Open event is configured to execute a Shell() call via WScript.Shell, which is a common technique for downloading and executing a second-stage payload. The document body prompts the user to enable content, indicating a social engineering lure to trigger the macro execution.

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
ab3ae906ac62c0922b6caba437995ac3c873f54ef1b9dbaec038f1a03316b11a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12571 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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