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

Static analysis result for SHA-256 ba455d3c12df4bc5…

MALICIOUS

Office (OLE) / .XLS

75.5 KB Created: 2020-05-29 01:52:35 Authoring application: Microsoft Excel
MD5: df4687694775784227622db18749931f SHA-1: 25e617b1af3dc2cbe5454c1d681b742e202bcc75 SHA-256: ba455d3c12df4bc53246ae247a13a3bd4fa483261931d668511e139b26045a5f
388 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that references URLDownloadToFile. The document body prompts the user to 'enable content to display this transaction SWIFT', indicating a lure to bypass macro security. The macro likely downloads and executes a second-stage payload, as suggested by the critical heuristic firings for URLDownloadToFile in VBA and the presence of a macros.bas file.

Heuristics 11

  • 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-7982572-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7982572-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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
9651d83379609d8a3b14f19dfa1a3281fbf8efb8e3c53e9093b28f353b3d2048		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14274 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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