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

Static analysis result for SHA-256 ff2c8cadaa0fd8da…

MALICIOUS

Office (OLE) / .DOCX

195.0 KB Created: 2016-11-25 19:04:00 Authoring application: Microsoft Office Word
MD5: 49b367ac261a722a7c2bbbc328c32545 SHA-1: 5bd2e2b8ddc65931704c8c3ea57adc2bb778f66a SHA-256: ff2c8cadaa0fd8da6138cce6fce37e001f53a5d9ceccd67945b15ae273f4d751
448 Risk Score

Malware Insights

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

The sample contains VBA macros, including AutoOpen and Auto_Close, which are designed to execute automatically. Critical heuristics indicate the use of WScript.Shell and a Shell() call, strongly suggesting the execution of arbitrary commands. This points to a macro-based dropper designed to download and execute a secondary payload. The presence of 'macros.bas' and 'ole10native_00.bin' further supports this analysis.

Heuristics 12

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Dropper.Agent-6338838-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6338838-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6ddcc9087fef33207f37f6a0bde3138f82e2e20e32d1162f83deb4484bc5913a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3062 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.
ole10native_00.bin
7c132424d9d0d39087125236e7065c974d288d29739f4bcd481c92d7252e6315		 ole-package OLE Ole10Native stream: ObjectPool/_1541577328/Ole10Native 20301 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.54, consistent with packed or encrypted content.

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