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

Static analysis result for SHA-256 41a29bcf5c8ebf15…

MALICIOUS

Office (OLE) / .XLS

290.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 05c9fe9e38218eec179a19fdb2c97890 SHA-1: e077cee572aedc897f32f6a2fb21e5e6696053dc SHA-256: 41a29bcf5c8ebf152ed8938bd951030116ab9e0421c00bf483b2931b7e18f36e
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 auto-exec macro. This macro utilizes WScript.Shell and a Shell() call, indicating it is designed to execute arbitrary commands. The primary function appears to be downloading and executing a secondary payload, though the specific URL or command is not directly visible in the static analysis.

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
b0c855e5cfecc5be050f2a9e66ad1741cee886ec67048f5a5913da85ba19ddda		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12545 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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