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

Static analysis result for SHA-256 7857ac9680b0b78c…

MALICIOUS

Office (OLE) / .DOC

118.5 KB Created: 2020-11-06 17:02:00 Authoring application: Microsoft Office Word
MD5: 29d57ce826d3f5482558de3e74c4a086 SHA-1: 53d428b693a28db4cf37fe067651cc854768b189 SHA-256: 7857ac9680b0b78c7ba3b8d7ba106a5cbacded63654a6378415e06153e9f884a
362 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a Document_Open VBA macro that utilizes WScript.Shell to download and execute a second-stage payload. The macro's intent is to download and write a file to disk, likely for further execution. The presence of WScript.Shell and the HTTP download/save functionality strongly indicate a downloader or droppper malware.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e7a2cb86e5e0f17fec2a0cb971edcd4e2863302476e4fea7a97cd1fb276a36fb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 32486 bytes

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