Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c8c401c4954c2644…

MALICIOUS

Office (OOXML)

61.4 KB Created: 2020-11-04 16:37:57 UTC Authoring application: Microsoft Excel 16.0300
MD5: e9ee4395c676f3ed2a9416ee2e5b4e31 SHA-1: 43472cb68832aa88e53f223ed56ca766c74c2580 SHA-256: c8c401c4954c2644fd57ec14e496c0dce5d56b7b5091f7a82899a7bc1cf090dc
258 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that utilize WScript.Shell and CreateObject to download a file via HTTP and execute it. The presence of Shell() and HTTP download/save functionality strongly indicates a downloader pattern. While the URLs themselves are benign, the macro's intent is to fetch and run a secondary payload.

Heuristics 8

  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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 https://api.smartsheet.com/2.0/sheets/
    • https://api.smartsheet.com/2.0/search/sheets/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c04b72b6e3f92680d960ecc935538fb1addb7b5af847535f0185bdbc3ed9f1ef		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 23922 bytes
vbaProject_00.bin
11cb49ceeb3a696f708a395dda12a97da663a8686492a6091beda1e08e57d1bb		 vba-project OOXML VBA project: xl/vbaProject.bin 63488 bytes

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