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

Static analysis result for SHA-256 ffec6e6d4e314f64…

MALICIOUS

Office (OLE) / .DOC

1.42 MB Created: 2021-03-29 07:22:00 Authoring application: Microsoft Office Word
MD5: f86fb4a63cdff302af2ccf2b2663d757 SHA-1: 3d57c7680f3f9351164f75a7d477a815e39b0389 SHA-256: ffec6e6d4e314f64f5d31c62024252abde7f77acdd63991cb16923ff17828885
560 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The sample is a malicious OLE document containing VBA macros. The macros utilize `Shell()`, `WScript.Shell`, `CreateObject`, `GetObject`, and `cmd.exe` to execute arbitrary code, likely downloading and running a second-stage payload. The `Document_Open` macro is automatically executed upon opening the document, indicating a dropper functionality. The ClamAV detection name 'Doc.Dropper.EmbeddedBase64Exe' further supports this assessment.

Heuristics 14

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • ClamAV: Doc.Dropper.EmbeddedBase64Exe-9865902-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmbeddedBase64Exe-9865902-1
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x41 bytes
  • 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
    • 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
e4fd19fa7fac4fee4d1cd81e216e1da27706bc84b7ba9768da7939348c9254eb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 242877 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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