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

Static analysis result for SHA-256 15d737e715abb994…

MALICIOUS

Office (OOXML) / .DOC

80.0 KB Created: 2021-04-01 07:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 0f8dcd896fde1b2e087c887e2c639165 SHA-1: 562e975b3840cc9133e7ef8dca3bbb8a13dce9d2 SHA-256: 15d737e715abb9947ccd9cfff25d5795fa583c97f573730fe350c62f2ee8bac8
302 Risk Score

Malware Insights

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

The sample contains VBA macros, including an AutoOpen subroutine, which is a common technique for malicious documents. The script utilizes WScript.Shell to execute a command, likely to download and run a secondary payload. The obfuscated string 'fTtlc29sYy5hdGFEd2VpdjspMiAsImdwai5iaUxyZWZmdWJcXGNpbGJ1cFxcc3Jlc3VcXDpjIihlbGlmb3RldmFzLmF0YUR3' is passed to the shell execution, suggesting it may be a base64 encoded command or URL.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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 project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.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.openxmlformats.org/markup-compatibility/2006
    • 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/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
50404992a18addc03be2c10582ade5bd59ed93bb6bab980357ed5911b9578ca5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9244 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
vbaProject_00.bin
4460c235618656a82b92cb654eb6ba2eb676894c57e2ebe032601a7fbd9aa8aa		 vba-project OOXML VBA project: word/vbaProject.bin 39936 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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