Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 edbb25dfdfe594eb…

MALICIOUS

Office (OLE)

97.5 KB Created: 2020-07-14 10:27:36 Authoring application: Microsoft Excel
MD5: b1258a49ab3ff21f9c8587cf2a8d17ec SHA-1: 2674729e6eaef9dd92e3cbe3e92e2ed809c911bf SHA-256: edbb25dfdfe594eb597484e31968fafa0462e81b203497aff0f5a60879860e53
428 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The file is an Excel document containing VBA macros, including Workbook_Open and Auto_Open, which are designed to execute automatically. The document body explicitly instructs the user to 'enable content to display this transaction receipt (SWIFT)', acting as a lure. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs within the VBA code, suggesting the macro downloads and executes a second-stage payload. The presence of 'macros.bas' further supports this. The ClamAV detection as 'Xls.Dropper.Agent-8885865-0' confirms its malicious nature as a dropper.

Heuristics 12

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Xls.Dropper.Agent-8885865-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8885865-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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
e88676c3fe21a8b5f688784886c796737f3e05a26e2afcc9b92d2e255465d0bf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19351 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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