Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2254889b715d3570…

MALICIOUS

Office (OLE)

180.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 6d40106f6254a4709fbc5ee82359a1b2 SHA-1: e1df7baf5d39a82ebb0fb0956d554ff4ea96a44a SHA-256: 2254889b715d357090efc3da8dfa5ed6407611605825038f9e1a9a3d949ae013
382 Risk Score

Malware Insights

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

This Excel document contains a Workbook_Open VBA macro that utilizes WScript.Shell to download and execute a second-stage payload. The macro's obfuscated nature and the critical heuristic firings for Shell() calls and HTTP download/execution strongly indicate a downloader or droppers functionality. The presence of a Workbook_Open macro and the instruction to enable macros are common lures for initial execution.

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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ac175cba9a968730d665bf0547f1371f66a973175faef79c7768a3d435163ecb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 19985 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.