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

Static analysis result for SHA-256 faa58bfb779ce23a…

MALICIOUS

Office (OLE) / .DOC

2.87 MB Created: 2023-04-10 21:00:00 Authoring application: Microsoft Office Word First seen: 2023-04-11
MD5: cfe361a242e37ab31265b55615dbad3c SHA-1: 209326c64c4073deacf5f9d934b997b7982be638 SHA-256: faa58bfb779ce23aee0e28d7bab18e5a35830377b85d6e091ec30fac0aad4096
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER heuristic, indicating an obfuscated auto-exec VBA loader. It utilizes Shell() and CreateObject calls, along with WScript.Shell, to likely download and execute a second-stage payload. The presence of a Document_Open macro further suggests immediate execution upon opening.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://siapinc4.cancer.gov.co/TMS.INTEROPDOC.SIAPINC/ServiceInterop.svc?wsdl
    • https://siapinc4.cancer.gov.co/TMS.INTEGRATOR.SIAPINC/WSGenerico/ServiceTMS.svc?wsdl
    • https://siapinc4.cancer.gov.co/SIAPINC/ModuloWebService/WSRadicacion/WSRadicacion.asmx?wsdl
    • https://siapinc4.cancer.gov.co/SIAPINC/moduloInterfaz/TWAIN/csRecibirArchivo.asp?IdDoc=@IdDoc@&Usuario=@IdUsuario@&Pagina=1&TipoDoc=@IdTipoDoc@&origen=TMSPDF&filename=@FileName@
    • https://siapinc4.cancer.gov.co/SIAPINC/CodeBar/CodeBarDin.asp?t=CODE128&al=36&ah=214&d=
    • http://tms.com.co/TMSAPP/moduloInterfaz/TWAIN/csRecibirArchivo.asp?IdDoc=@IdDoc@&Usuario=@IdUsuario@&Pagina=1&TipoDoc=@IdTipoDoc@&origen=TMSWORD&idanx=3465&filename=@FileName@
    • http://vserv002/MENGESDOC/CodeBar/CodeBarDin.asp?d=2015-EE-092945&t=CODE128&al=36&ah=214
    • http://tempuri.org/RadicarDocumento
    • http://tempuri.org/GuardarDocumentoExistente
    • http://tempuri.org/GuardarRadicarDocumentoExistente
    • http://tmsdev/tms.solution.tms2015/Usuario/ImagenFirma/admin
    • http://@tmsdev�
    • http://www.tms.com.co/IServiceEntidadesTMS/ObtenerEntidadParametrizada
    • http://www.tms.com.co/
    • http://certsigme.sertisoft.com.co/TMS.INTEGRATOR.SIGME/WSGenerico/ServiceTMS.svc?wsdl
    • http://localhost/TMS.Solution/EditorDocumentalRich/ImagenControlVersiones?idDocumento=72394
    • http://localhost/TMS.Solution/EditorDocumentalRich/ImagenControlVersiones?idDocumento=76477
    • http://s�chemas.�
    • http://tempuri.org/
    • http://s�chemas.@cAA
    • http://tempuri.org/getXMLDocumento
    • http://tempuri.org/getXMLDocumento�
    • http://www.tms.com.co/IServiceInterop/CicloAprobacionGestionar
    • http://181.143.164.212/SIAPINC/ModuloDocumental/VerAnexos.asp?valruta=1&mapnorm=1&idDocumento=
    • http://schemas.openxmlformats.org/drawingml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
    • http://schemas.xmlsoap.org/soap/envelope/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ddd8355839421f2ed10a6cbb494673698fcff9549c3dfe4cb996d2f045463c91		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3424136 bytes

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