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

Static analysis result for SHA-256 42f5f5474431738f…

MALICIOUS

Office (OLE) / .DOCX

7.56 MB Created: 2021-03-28 14:37:00 Authoring application: Microsoft Office Word
MD5: fe185f106730583156f39233f77f8019 SHA-1: e8378aede9f26f09b7d503d79a05d67612be15f6 SHA-256: 42f5f5474431738f91f612d9765b3fc9b85a547274ea64aa034298ad97ad28f4
248 Risk Score

Malware Insights

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

The document contains a VBA macro that automatically executes upon opening, indicated by the 'Document_Open' macro and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. This macro utilizes a 'Shell()' call, suggesting it is designed to download and execute a second-stage payload. The presence of a large VBA macro file ('macros.bas') further supports this analysis.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
    URL http://schemas.openxmlformats.org/drawingml/2006/main
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
    URL http://schemas.openxmlformats.org/drawingml/2006/main
  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a70560c6879d6611f744227097c6f77af64db72e2bee658dd1321f8a2f563104		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 147915 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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