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

Static analysis result for SHA-256 d75a1f7a80cae824…

MALICIOUS

Office (OOXML) / .DOCM

70.7 KB Created: 2021-01-21 21:18:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: bb7af1c19303a70bfe8802455973063d SHA-1: 9918d328b7ab2fd23a8b2cd31bcc95e9e72d8459 SHA-256: d75a1f7a80cae824d8f6446bfd07c1491c9455377d7877b7903cffd222ec9488
260 Risk Score

Malware Insights

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

This DOCM file contains VBA macros, indicated by the OOXML_VBA heuristic. The presence of CreateObject and CallByName calls suggests dynamic code execution. ClamAV detections (Doc.Malware.Valyria-10033904-0) on both the file and an extracted artifact confirm its malicious nature. The VBA macros are likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-10033904-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10033904-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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 vbaProject.bin — 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.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/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
1c8725c1b68aa7c07a48359ab5d91ec0ded54e52bc3decc82f1c4703bcc71a41		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9334 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
1d7f62e5b3f5d8204422c93373a9743a30ecbf21df1eb2fe151d544113e5377d		 vba-project OOXML VBA project: word/vbaProject.bin 44032 bytes
Detection
ClamAV: Doc.Malware.Valyria-10033904-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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