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

Static analysis result for SHA-256 0f7e9d02ee54ec28…

MALICIOUS

Office (OLE) / .XLS

64.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: e8182e71016a93333f7e7cc1c026ddee SHA-1: 5733a0f32ffdaf140c5b8d76086b73a9d3b586b2 SHA-256: 0f7e9d02ee54ec28db36a83bba620cac28633707bd51431b297b4d0cd08f7d77
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate T1071.001 Web Protocols

The sample is an Excel file containing obfuscated VBA macros. The Workbook_Open macro is designed to execute a shell command, likely to download and execute a second-stage payload. The document body displays a lure to enable content, which is a common tactic for macro-based 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
c16cf56e6a38938c102cecd8d1180a4ca23f30c8ff7920d589ba0fd1e4f967b8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 26728 bytes

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