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

Static analysis result for SHA-256 0c899fbd963450fd…

MALICIOUS

Office (OOXML) / .DOCX

66.8 KB Created: 2019-10-27 18:57:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 61b15153f8b5408cab55475f43c6786f SHA-1: 6a2d1fe4f9216c8c61d3e7341784975992693c07 SHA-256: 0c899fbd963450fdf0d3d487fd91c0ef00e8c4191115d99d58a6b75476b06254
270 Risk Score

Malware Insights

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

The sample is a malicious Office document containing an obfuscated VBA macro with a Document_Open auto-execution routine. The macro uses CreateObject to execute a command, likely to download and run a second-stage payload from a hardcoded URL. The VBA code attempts to construct a path for persistence, potentially writing to 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'. The ClamAV detection 'Doc.Dropper.Agent-7569506-0' further confirms its malicious nature as a dropper.

Heuristics 8

  • 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.Dropper.Agent-7569506-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7569506-0
  • 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://43.250.164.92/smartek/jEr584/
    • https://khanhbuiads.com/wp-includes/XVq/
    • http://jonesmemorialhomes.com/463cfd0d43fce8696f19b37cb78ea33c/HO178/
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3c623bfdfca5636d02b577f36fd367045c46d496b69e0208c542f2786ba54d23		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5200 bytes
vbaProject_00.bin
0a46cb04cb17cea514c38cb77933c4debb673fc12e8a2634aab838d09ec40388		 vba-project OOXML VBA project: word/vbaProject.bin 24576 bytes

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