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

Static analysis result for SHA-256 46107dcd8566a284…

MALICIOUS

Office (OLE) / .XLS

285.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 6bfc5113f3b09d7d3e7c04f4e92b73b8 SHA-1: 09b10f2fb26a59a32c5c1c4d45aaa04d61d67626 SHA-256: 46107dcd8566a2842905cf1e92d306b24c06f4645ad9cc39de4e12c602ac64a6
340 Risk Score

Malware Insights

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

The file contains VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell to execute commands. This strongly suggests the macro is designed to download and execute a secondary payload. The use of Shell() and WScript.Shell points to a common downloader pattern.

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
ff82114795fefe347894aa6bd66c1df0a598f916ffe6d9f8b5ae532b4f2363bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12556 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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