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

Static analysis result for SHA-256 99cf04b4681e23be…

MALICIOUS

Office (OLE) / .XLS

89.0 KB Created: 2020-12-03 14:07:41 Authoring application: Microsoft Excel
MD5: 5aefdf6afc1e5eb0d642ad7a0c245088 SHA-1: ad5a6f0bf5b0a8d4d5efcf33ea5d7ce588921a10 SHA-256: 99cf04b4681e23be9445dd54668231f52276645f4c263e4d2c1c730e7d264303
400 Risk Score

Malware Insights

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

This XLS file contains obfuscated VBA macros, including a Workbook_Open auto-execution routine. The macros utilize WScript.Shell and CreateObject to execute commands, strongly indicating a downloader or dropper functionality. The presence of `Shell()` and `WScript.Shell` calls suggests the script's intent is to download and execute a second-stage payload. No external URLs were found to be malicious, and the document body is minimal.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
58c070552620d800261909a47634f927e2ec3eeae95bd8c779bad3bd0c7689dc		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 37601 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 113 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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