Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 df155b33faa28008…

MALICIOUS

Office (OOXML)

16.3 KB Created: 2021-10-25 10:56:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0285dc70b6a71ba340b6d6e279382471 SHA-1: 65fc4ebdc92a5745645ad153c626430b96aa27d4 SHA-256: df155b33faa2800845f0a46568abdeb2eb0d391867bd18f94702ed101895535b
302 Risk Score

Malware Insights

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

The VBA macro contains a Workbook_Open event that triggers the download of a file from "https://unchildlike-interpr.000webhostapp.com/microsoft-service.file". The downloaded content is saved as "c:/Users/<<USERNAME>>/AppData/Local/Temp/tt.file" and then renamed to "c:/Users/<<USERNAME>>/AppData/Local/Temp/microsoft-service.exe". The script also attempts to execute this renamed file using cmd.exe, indicating a downloader or dropper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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://unchildlike-interpr.000webhostapp.com/microsoft-service.file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a32c0ad2011f858e6ede59c3b9c7c57f5745416e70135451b339454eae789b7c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1702 bytes
vbaProject_00.bin
050d6d3acbfa1566e0b92e0aa3d58189d915c6685912ad62064c3c36b7c8deb7		 vba-project OOXML VBA project: xl/vbaProject.bin 19456 bytes

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