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

Static analysis result for SHA-256 3b548a851fb889d3…

MALICIOUS

Office (OLE) / .DOC

4.65 MB Created: 2021-02-16 10:40:00 Authoring application: Microsoft Office Word
MD5: 49696043b51acca6ced2ab213bd4abef SHA-1: fc0b7ad2ae9347d6d2ababe2947ffb9f7cc73030 SHA-256: 3b548a851fb889d3cc84243eb8ce9cbf8a857c7d725a24408934c0d8342d5811
408 Risk Score

Malware Insights

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

The sample is a malicious OLE document containing VBA macros. The 'Document_Open' macro is configured to execute automatically, and it uses 'CreateObject' and references 'WinExec' and 'mshta.exe', indicating it's designed to run external code. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's content is a pretext to convince the user to open a password-protected archive, which likely contains the actual malware. No specific URLs or hashes were extracted, but the ClamAV detection 'Doc.Dropper.EmbeddedBase64Exe-9865902-1' confirms its dropper functionality.

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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