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

Static analysis result for SHA-256 d4b36731cb37ad05…

MALICIOUS

Office (OLE) / .XLS

1.20 MB Created: 2020-09-23 10:48:49 Authoring application: Microsoft Excel
MD5: da8215ba1d8140400a4556d4420b2b64 SHA-1: 83d796c789368672a4f0300c3be5b7c1e3e467bb SHA-256: d4b36731cb37ad05b0b9678b568c10a56f2e84967b393b626afb19d2df41c9b9
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute arbitrary code. This strongly suggests the macro is designed to download and execute a second-stage payload. The ClamAV detection 'Ole2.Macro.Agent-9858803-2' further supports its malicious nature. No specific family could be identified.

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: Ole2.Macro.Agent-9858803-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Macro.Agent-9858803-2
  • 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://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://www.iec.ch

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e4a6517be43b51b9553853e439e1876fb9283f0a755561197356110611f3bfae		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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