Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 560b7ae91643322f…

MALICIOUS

Office (OOXML)

7.5 KB
MD5: 307eba3b1070ce77322c38c0415a8ac9 SHA-1: 5ee0dbed76a996a8bcddd0b423aa7edbbadafe76 SHA-256: 560b7ae91643322f878ed0bd03d0fe75c7f0b803d4c7fa581edbba36b3a4eece
170 Risk Score

Malware Insights

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

The sample is an OOXML document containing a VBA macro with an Auto_open subroutine. This macro utilizes the URLDownloadToFileA function to download a file from 'http://updatewin32.xyz/3.txt' and save it as 'msi.ps1' in the Public user directory. The execution of this macro indicates an attempt to download and execute a second-stage payload, likely for further malicious activity.

Heuristics 6

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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)
  • 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 http://updatewin32.xyz/3.txt
    • http://updatewin32.xyz/3.txt�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2c84ba19b3afec4ffd6de7a1a88e04f6ee9e983c16a77e4873534639ca3b1e41		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 397 bytes
vbaProject_00.bin
b1d8a3536e65ac4b4a243de434c85b8116658ec74c60899ca5949827fe385345		 vba-project OOXML VBA project: ppt/vbaProject.bin 16384 bytes

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