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

Static analysis result for SHA-256 aafd753b84e1eef7…

MALICIOUS

Office (OLE) / .DOC

147.0 KB Created: 2021-03-28 21:26:00 Authoring application: Microsoft Office Word
MD5: dd32ca38fe227bb728c1ef2a5be30a50 SHA-1: 3d72dea849268a249cec1a0821158d7b2f33ec1c SHA-256: aafd753b84e1eef76d8925ca0e9e5ed551a4a3f955176af6c1b4051b9fb4a957
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains a Document_Open VBA macro that utilizes WScript.Shell and CreateObject to execute obfuscated commands. These commands appear to download and execute a second-stage payload from the provided URL. The presence of critical heuristics for Shell() calls, WScript.Shell usage, and obfuscated shell commands with URLs strongly indicates a downloader or droppper functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • 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.
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://auko.freetzi.com/WD/wordpress/wp-content/uploads/2021/03/jan11.ex
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b39c9226113a0e7207690769a6a7d3837c6d255ae6b660ad1bc78b080c616c1c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 844 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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