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

Static analysis result for SHA-256 a140a4e60c699dcf…

MALICIOUS

Office (OLE) / .DOC

596.5 KB Created: 2021-04-13 17:08:00 Authoring application: Microsoft Office Word
MD5: 35565823b582b224a7c8c30f45495924 SHA-1: 2951cb3a5274ed7229fe054b123c7184d0faae65 SHA-256: a140a4e60c699dcf110678fca8cfd259660d21c428256898a65f9d3f196b8c13
380 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 DOC file containing VBA macros. Critical heuristics indicate the use of WScript.Shell and a Shell() call within an AutoOpen macro, suggesting the script attempts to execute arbitrary commands. The presence of 'VBA p-code auto-exec with execution tokens' further supports that the macros are designed to run automatically and execute code. The primary intent appears to be downloading and executing a second-stage payload.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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
70d143fcb2424770a9400151562919696b8a3e29a46abf2493d78828f36a6305		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1949 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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