Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3e9581e1caa57425…

MALICIOUS

Office (OOXML)

8.1 KB
MD5: 79db54ab4c5c185b1c660aecb658edd1 SHA-1: b0c70c2f1d0a50cf4a1f2e92c1bbe13021bddcba SHA-256: 3e9581e1caa5742548831f9e662acd0dc040090483126a8c0957624b1a0608c6
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The sample contains VBA macros with Auto_open and Auto_close functions. The Auto_open macro utilizes URLDownloadToFile to download two files: 'msi.ps1' from http://updatewin32.xyz/3.txt and 'ComeCome.vbs' from http://edc.com.ly/index/wp.txt. The Auto_close macro attempts to execute 'ComeCome.vbs' using WMI's Win32_Process.Create, indicating a multi-stage infection chain.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
  • 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://edc.com.ly/index/wp.txt
    • http://updatewin32.xyz/3.txt�
    • http://edc.com.ly/index/wp.txt�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
95f5d15ef6a8ceb79421af1002d32b76b913e8ee71dc9275f03d418fa2723c2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 823 bytes
vbaProject_00.bin
bed4e7e0d8df60558394ba300607cd4470825a08c27f401eeac33d56346991c4		 vba-project OOXML VBA project: ppt/vbaProject.bin 17920 bytes

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