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

Static analysis result for SHA-256 ce909bb48dbe83d2…

MALICIOUS

Office (OLE) / .XLS

90.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-07-29
MD5: e3ea01a33cf29518d76aa4ee7dee0b65 SHA-1: d96ae0210b3954d0f06be009235aeda1c72a6daa SHA-256: ce909bb48dbe83d2c138881743977bc1541b06e424ea88b9d811c3fe52dce5f0
362 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical heuristic OLE_VBA_HTTP_DROP_EXEC indicates that the VBA macros within this XLS file are designed to download a file from the internet and save it to disk. The presence of OLE_VBA_WSCRIPT and OLE_VBA_SHELL heuristics, along with OLE_VBA_PCODE_AUTOEXEC_EXEC, confirms that the Workbook_Open macro uses WScript.Shell to execute the downloaded payload. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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
0073487d75a3b23860cf3e1e5d3db96d26ac81661c651256529ed51fdce2c5a6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 25560 bytes

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