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

Static analysis result for SHA-256 7a60f0565a5e3f43…

MALICIOUS

Office (OLE) / .XLS

54.5 KB Created: 2021-03-24 01:55:29 Authoring application: Microsoft Excel
MD5: 3013ce22608341008e95045ffe3c77e0 SHA-1: c9d7c2236018deec3a73a84c368714b0263c6a30 SHA-256: 7a60f0565a5e3f4310090a6519ff72571a32d30bd4f89b641ce3aaccaab30b45
382 Risk Score

Malware Insights

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

The Excel file contains VBA macros that utilize WScript.Shell and CreateObject to download and execute a second-stage payload. The Workbook_Open event is triggered upon opening, and the embedded document body instructs the user to 'Enable content to resize below invoice'. The script's obfuscation makes it difficult to determine the exact URL or final payload, but the intent is clearly to download and execute.

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
40ff229323eae7e7cb0253a91f01476f8c7fca32e029f1f9cf99e2f05daf97d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3723 bytes

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