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

Static analysis result for SHA-256 6f40028f8cc674a3…

MALICIOUS

Office (OLE) / .DOCX

140.0 KB Created: 2022-01-05 22:52:00 Authoring application: Microsoft Office Word
MD5: e2235a813cb871f2156148c7fc13489f SHA-1: 58f87762f55ee61d8ff601381840755da95d4311 SHA-256: 6f40028f8cc674a39ca5564371ec08400e09c0f04cb55dba2f2791292e80920c
492 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The sample contains a critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER heuristic, indicating an obfuscated auto-exec VBA loader. The VBA script uses WScript.Shell and CreateObject to download a file from the reconstructed URL 'fyf/nkhoygoh0wkihkdbkbcldckldklopjbgyghyggh{etgiwclw{tehgwtewt0npd/hojmsvi.tk/xxx' and save it to the AppData directory, likely to execute a second-stage payload. This behavior is consistent with a macro-based downloader.

Heuristics 13

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • 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.
  • 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)
  • Suspicious extracted artifact info 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e966dd643cfb7131e66de9aec455550324a60a5579c9c53652121d3244460a01		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 36677 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 141 long base64-like blob(s).

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