Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fcde890a1d7b929b…

MALICIOUS

Office (OOXML)

20.9 KB Created: 2021-07-11 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 077648a1c341c34e75e41b201a69badb SHA-1: 051661143be713a7deaf68ecb0d3b9a08c8d45f2 SHA-256: fcde890a1d7b929b33e99abd9763524810dc5373cf1c9608cbf3712cb2c2e245
182 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Doc.Malware.Valyria-10015188-0. It contains VBA macros, including an AutoOpen macro, which is a common technique for executing malicious code upon opening the document. The VBA code appears to use Windows API calls to create and manage processes, suggesting it's designed to download and execute a secondary payload.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-10015188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10015188-0
  • 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
972bf870ceb19959146783c3a7ed397bd19f4689b2aaa7796832626229e3ea0d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4584 bytes
vbaProject_00.bin
64ec60f3aae310a4ba960dbe2098f953fe3f3a8e5b116e5d5bcc60d3ff444f8d		 vba-project OOXML VBA project: word/vbaProject.bin 22528 bytes
Detection
ClamAV: Doc.Malware.Valyria-10015188-0
Obfuscation or payload: unlikely

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