Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 28c455cafa16b359…

MALICIOUS

Office (OOXML)

16.6 KB Created: 2021-10-25 10:56:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: 59aaba4fd84770973d3773f03bb5f589 SHA-1: 7d93f100e7ab4e9bbb41926c03730973915887bb SHA-256: 28c455cafa16b3592e1e069f306704ff21393cb52e586de3708d26dca26e1010
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" to "c:/Users/USERNAME/AppData/Local/Temp/tt.file". The script then attempts to rename this file to "microsoft-service.exe" and execute it. This indicates a clear intent to download and run a second-stage payload, likely for further malicious activity.

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
    • https://unchildlike-interpr.000webhostapp.com/microsoft-service.file�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9be04fb86fd37bcd7ecacba4d52346038b6e08e1a00ae63518a067e146b5a992		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1701 bytes
vbaProject_00.bin
2d0f65181a83d86ea86908803af37480bffe6c9afae905ae78df99d7be4476cf		 vba-project OOXML VBA project: xl/vbaProject.bin 19968 bytes

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