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

Static analysis result for SHA-256 1443a7c909d15c0a…

MALICIOUS

Office (OLE) / .DOCX

167.0 KB Created: 2021-01-05 17:50:00 Authoring application: Microsoft Office Word
MD5: 0c0eec557a8c8c449f15615556e2f0c0 SHA-1: 28f78a5c0ff0d95502abc7c7493afe1437ce09d5 SHA-256: 1443a7c909d15c0a3c758084da3d2d857a651c23e4d2d26d19a32b4cdef1ea58
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains obfuscated VBA macros that execute upon opening the document. These macros utilize CreateObject to instantiate a FileSystemObject, which is then used to create and write to files named 'sBFJHmWJ.ByrvyNXI' and 'CbWlODM.ssogG' in specific directories. This behavior strongly suggests the macro is a downloader for a second-stage payload.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Doc.Downloader.EmotetRed02224-9938637-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02224-9938637-0
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4ad47f06387c2fe26b40af7c5c3febabd490580f16728c81acf291150b2fb0bb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10757 bytes

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