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

Static analysis result for SHA-256 c66970bdd757e643…

MALICIOUS

Office (OLE) / .XLS

126.5 KB Created: 2020-12-26 12:17:15 Authoring application: Microsoft Excel
MD5: 35c9dbe44c092a5ebb101e1600736228 SHA-1: 21083aa36e32aea90469131690c3d93f0f7f6c85 SHA-256: c66970bdd757e643f76b613a6302a14c6ea6eb6032aebc6b4cfc84fc265c485f
340 Risk Score

Malware Insights

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

The sample is an XLS file containing VBA macros. The Workbook_Open macro is present and utilizes WScript.Shell and CreateObject to execute arbitrary commands, likely to download and run a second-stage payload. The presence of WScript.Shell and Shell() calls strongly indicates malicious intent.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8f26e5bd5f52a112ff1ac87723a57537275a5cf255c75437fd3d1a32ad658320		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 18551 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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