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

Static analysis result for SHA-256 174c621f41276dd1…

MALICIOUS

Office (OLE) / .XLS

103.0 KB Created: 2020-10-28 10:11:18
MD5: 3e6a8240eac4d40fa5fa1212743d7c50 SHA-1: 1c514bcd4a4285166ec7a8cf14d17939b3a0eb15 SHA-256: 174c621f41276dd1732bb57b4e44aa0c5476ee3bf890a3ba0e02f7565d283d9c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic 'OLE_VBA_ACTIVEX_XLM_STAGER' indicates that VBA macros are used to launch decoded Excel 4.0 macros. The VBA script contains obfuscated logic that appears to construct and execute commands, likely to download and execute a second-stage payload. The presence of 'seller' in the document body and as a control name suggests a potential lure related to online marketplaces.

Heuristics 3

  • VBA ActiveX event launches decoded Excel4 macro critical OLE_VBA_ACTIVEX_XLM_STAGER
    VBA code attached to an auto-firing ActiveX/UserForm control event (e.g. _Layout/_Change/_Painted) decodes a string with Replace/Split/Join/StrReverse/Chr and passes the recovered formula text to ExecuteExcel4Macro. This bridges VBA event activation into XLM formula execution to call Win32 APIs / drop payloads while evading AutoOpen and Shell keyword detection — a high-confidence macro stager, not a specific Office parser CVE.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • 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
5c4734a75372bd0c102f2ac5cd5923e4742d5a9370c49b3d6c2875a78d45aa54		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1571 bytes

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