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

Static analysis result for SHA-256 75ddf363ff69cefa…

MALICIOUS

Office (OLE) / .XLS

58.5 KB Created: 2021-03-24 01:55:29 Authoring application: Microsoft Excel
MD5: e87abfa78f74c6808c1f73ea0479face SHA-1: d835576190152dc257bcd534272f32df446be011 SHA-256: 75ddf363ff69cefac0dfd6acc595b096e46e71a85500df8b49cb828e541c822d
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes WScript.Shell to download and execute a second-stage payload. The document body prompts the user to 'Enable content to resize below invoice', acting as a lure. The macro's obfuscated download and execution functionality is a strong indicator of a downloader malware.

Heuristics 10

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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
3b83a17e9438ab84ba3acb74d7aef42a06ba81128ffb712c1bc7cd55a94e7ae8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3722 bytes

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