Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8bbb9b3d34da4af2…

MALICIOUS

Office (OOXML)

21.5 KB Created: 2021-07-11 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 4b5fc0cf7c1ffb6f56fd75a766b97113 SHA-1: cda1e14770071c8c9c37db6d96f81f70f7730e34 SHA-256: 8bbb9b3d34da4af2b7f9e614dfa0a7ca5a90d12ad685b926f6975ee13517224a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an OOXML document containing VBA macros, specifically an AutoOpen macro, which is a common technique for executing malicious code upon opening. The presence of the 'macros.bas' file and the 'vbaProject_00.bin' artifact further confirms the macro-based nature of this threat. The VBA code appears to be designed to download and execute a second-stage payload, although the specific download URL is not directly visible in the provided script excerpt.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-10012625-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10012625-0
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.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
1c7b377b41b95e6af7115e3de3910a96b64e0fb31316b9935bac9a3d544b1789		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6212 bytes
vbaProject_00.bin
0c03d5526d8d23db8bc4d06b3673cd46e77161fdb2be1f34058d968e56c4a50e		 vba-project OOXML VBA project: word/vbaProject.bin 23040 bytes
Detection
ClamAV: Doc.Malware.Valyria-10012625-0
Obfuscation or payload: unlikely

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