Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 2ad9a7b364109c68…

MALICIOUS

Office (OOXML) / .XLSM

92.0 KB Created: 2015-01-15 16:55:01 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-12-30
MD5: d04491647385cc373152651890cbc6e0 SHA-1: b288e5e87ce113af41881431c7004904f6d6ba89 SHA-256: 2ad9a7b364109c68f911729a3dcde001e6df45e80164f87b0054e8e78161fe99
338 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Workbook_Open macro automatically executes upon opening the document. It utilizes WScript.Shell and CreateObject to download a file from a URL and execute it. The macro also attempts to modify Excel security settings to allow VBA execution. The presence of a Workbook_Open macro, Shell() calls, and HTTP download functionality strongly indicates a downloader or initial access payload.

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.
  • 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 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 2 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://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1
    • https://www.dropbox.com/s/zhp1b06imehwylq/Synaptics.rar?dl=1�
    • https://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download
    • https://docs.google.com/uc?id=0BxsMXGfPIZfSVzUyaHFYVkQxeFk&export=download�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e641847ccb4454ae8aee6b764f337d2b79450fb4ece918c9383e8430c4552946		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6480 bytes
vbaProject_00.bin
d6f20828e80e5a418aa029b897015e02462aac7f44f3c6bdbb26d1ba9a909d9e		 vba-project OOXML VBA project: xl/vbaProject.bin 24576 bytes

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