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

Static analysis result for SHA-256 61c7eb8c33d7eb01…

MALICIOUS

Office (OLE) / .DOCX

39.5 KB Created: 2020-06-25 10:02:00 Authoring application: Microsoft Office Word
MD5: 205b4d4b93e744d9ae520b62e98c7619 SHA-1: 688752c9a25d28e3533cc98b37d98bc688614207 SHA-256: 61c7eb8c33d7eb01285c503fa72d249f470fe3606ff10e459cfdc2f9e3d59b35
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample contains a VBA macro that is automatically executed upon opening the document. This macro is obfuscated and uses the Shell() function to download a second-stage executable from 'http://entrega-vertices.com/10G1B.exe' and save it to the temporary directory as 'filename.exe'. The script then executes the downloaded file. The presence of a lure to enable macros and the obfuscated execution of a remote payload strongly indicate a malicious downloader.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://entrega-vertices.com/10G1B.bbc
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
768917182b4d60eb69f0e7b2f7f996bac69b2b9d7d9a26a671d2f8600385770d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1433 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.