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

Static analysis result for SHA-256 712fd163cc98f8fb…

MALICIOUS

Office (OOXML) / .DOCM

188.7 KB Created: 2021-09-19 15:22:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-27
MD5: 4e3fe2ad8dc94dbf82847aa9c18e7efd SHA-1: c6623f75c837d4579e3282bd5871516475d8af3a SHA-256: 712fd163cc98f8fb2055573336c606f17c66a22276dce9f6e9f909e3d6d23f16
124 Risk Score

Malware Insights

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

The file is a DOCM document containing VBA macros, as indicated by the OOXML_VBA heuristic. The script uses CreateObject, a common technique for executing malicious code. The VBA code appears to decode a string from concatenated parts, which is then likely used to download and execute a secondary payload. The ClamAV detection further confirms its malicious nature.

Heuristics 5

  • ClamAV: Win.Malware.Agent-9896056-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Malware.Agent-9896056-0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Suspicious extracted artifact info 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.
  • 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.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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/wordml
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash
    • 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
    • http://schemas.microsoft.com/office/2009/07/customui

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8627579ac64390c6c63a28292b2ba3b71b377752ffcdb810e0dafa2deb3a6743		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 37949 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 37 long base64-like blob(s).
vbaProject_00.bin
5db4497474066653bc0c25ac165b45a22857e3af76e716cf6d1f32b420649cf1		 vba-project OOXML VBA project: word/vbaProject.bin 74240 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 37 long base64-like blob(s).

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