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

Static analysis result for SHA-256 ec9d801b120855fe…

MALICIOUS

Office (OLE) / .DOC

60.5 KB Created: 2020-04-19 02:19:00 Authoring application: Microsoft Office Word
MD5: 8820d5920c860ab6a803bb8871e5d462 SHA-1: fa1a5428131733ca8f37a77a7ee768e0d47dc9db SHA-256: ec9d801b120855fe926902234e77c60d5a0c8a115a977fe49e6b6b1539e0db51
400 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 critical heuristics indicate the use of `Shell()` and `WScript.Shell` within a `Document_Open` auto-exec macro, which is a common pattern for executing arbitrary commands. The `macros.bas` artifact confirms the presence of VBA code. This macro likely downloads and executes a second-stage payload, as suggested by the `OLE_VBA_SHELL` and `OLE_VBA_PCODE_AUTOEXEC_EXEC` firings.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
028ba60b8246c7bf6d29e31c59726e29b2d6f1d0dbf3228b079850b1c701ce4e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14490 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 69 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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