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

Static analysis result for SHA-256 ef385ed64f795e10…

MALICIOUS

Office (OLE) / .XLSX

1.53 MB Created: 2019-11-20 15:27:56 Authoring application: Microsoft Excel First seen: 2022-03-15
MD5: 72e371542ad6fda96bb3fc3b1ee68d92 SHA-1: 3f37ca0db6442743e34768e44450752637930523 SHA-256: ef385ed64f795e106d17c0a53dfb398f774a555a9e287714d327bf3987364c1b
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro, which is designed to execute automatically. The script uses CreateObject and CallByName functions, indicating it attempts to interact with the system to download and execute a payload. The ClamAV detection of 'Xls.Dropper.Agent-7551477-0' strongly suggests its malicious nature as a dropper. The script also appears to access environment variables and potentially write to the registry, further supporting its role as a downloader.

Heuristics 9

  • ClamAV: Xls.Dropper.Agent-7551477-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7551477-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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
  • 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://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8cb9e807e3e63f0e6692840d7c837280bd9514e463d06cd76a8fa83331657c83		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4309 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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