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

Static analysis result for SHA-256 1dd03c4ea4d630a5…

MALICIOUS

Office (OLE) / .DOC

4.72 MB Created: 2021-02-05 16:34:00 Authoring application: Microsoft Office Word
MD5: c9a43fd6623bf0bc287012b6ee10a98e SHA-1: 71b4b9f105de94090fc36d9226faaa1db6d9f3d1 SHA-256: 1dd03c4ea4d630a59f73e053d705185e27e2e2545dd9caedb26a824ac5d11466
408 Risk Score

Malware Insights

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

The sample contains VBA macros, including an auto-executing Document_Open macro that uses CreateObject and references mshta.exe, indicating an attempt to download and execute a payload. The presence of a heap spray pattern and WinExec API reference further supports malicious intent. The ClamAV detection and heuristic firings strongly suggest this is a dropper.

Heuristics 12

  • ClamAV: Doc.Dropper.EmbeddedBase64Exe-9865902-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmbeddedBase64Exe-9865902-1
  • Heap-spray pattern detected high SC_HEAP_SPRAY
    Repeated 0x41 (A) bytes found
  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5cfba1a7865e812ebf8b596b84251424a33f0377abd54e9666314a2c4045120c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1331 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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