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

Static analysis result for SHA-256 5184caaa51f3f661…

MALICIOUS

Office (OLE) / .XLS

90.5 KB Created: 2021-03-18 07:16:28 Authoring application: Microsoft Excel
MD5: db196958b90a5716d64cf12e3ca92cc2 SHA-1: b51c1611a227de1fac3d020259306157e1dacc2f SHA-256: 5184caaa51f3f661060731ef43e83f7d1978779ef224a83e819558f925eee73e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The file is an XLS document containing a Workbook_Open VBA macro. This macro utilizes a CreateObject call, indicating it is designed to execute arbitrary code upon opening. The macro's auto-execution and the presence of a long encoded blob within the extracted VBA code suggest it likely downloads and executes a second-stage payload. No specific family could be identified, and the extracted URLs were confirmed benign.

Heuristics 6

  • 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://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
79c66c2899dd23cab8b8b22386cb303ab389d776a3073a2a501be5ab00471772		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8982 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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