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

Static analysis result for SHA-256 6e50e65114131d65…

MALICIOUS

Office (OLE) / .XLS

1.48 MB Created: 2019-11-20 15:27:56 Authoring application: Microsoft Excel First seen: 2022-03-15
MD5: bb9872bb18840b7e8a887b3be3b621c6 SHA-1: 4e68e6daf702c6f8f2a7aed3fb23169f331fd47c SHA-256: 6e50e65114131d6529e8a799ff660be0fc5e88ec882a116f5a60a2279883e9c4
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical ClamAV detection and high-severity heuristics for OLE_VBA_MACROS, OLE_VBA_WBOPEN, OLE_VBA_CREATEOBJ, and OLE_VBA_CALLBYNAME indicate the presence of malicious VBA code. The Workbook_Open macro is designed to execute obfuscated functions that likely download and run a secondary payload, as suggested by the CreateObject and CallByName calls. The VBA code appears to be a downloader, and the ClamAV signature points to a dropper family.

Heuristics 8

  • ClamAV: Xls.Dropper.Agent-7554673-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7554673-0
  • 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.
  • 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
b820717af92971721e084787962a22a4af067248f55580c614cdb492b9a05635		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4307 bytes

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