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

Static analysis result for SHA-256 b7021333121f95f2…

MALICIOUS

Office (OOXML) / .DOC

814.2 KB Created: 2021-05-13 12:20:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 581a98e731020cb378ebcd76a32188fa SHA-1: 2541b168975edd4106f4671b0036a32d25dd946a SHA-256: b7021333121f95f224878e169b04dde4aeea593469837f89c3dc723380a5ae25
442 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro that utilizes Shell() and WScript.Shell to execute arbitrary code. This strongly suggests an attempt to exploit a vulnerability, potentially CVE-2026-21514, to download and run a second-stage payload. ClamAV detections of 'Win.Packed.Zusy-9861419-0' on both the original file and an extracted artifact further confirm its malicious nature.

Heuristics 11

  • OOXML Ole10Native with payload/link indicators — possible CVE-2026-21514 high CVE likely CVE_2026_21514
    Office document contains embedded OLE (word/embeddings/oleObject1.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Win.Packed.Zusy-9861419-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Packed.Zusy-9861419-0
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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 OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
    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/2016/wordml/cid
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b82bc0b14885dd0d3e622af3ef0130a26bb8bda86710b1dad568b9cf5e3dc183		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5487 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
ooxml_oleobject_00.bin
5b66eb58cf340e97f6e9e9dea4e46f552fb6d9a7d53deb01055b9fd075b000c3		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 425472 bytes
Detection
ClamAV: Win.Packed.Zusy-9861419-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin
1f7dbe7c197573e34753136fe9ac3c66786b0f970cf1cd352cd196974300f3f0		 ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 413978 bytes
Detection
ClamAV: Win.Packed.Zusy-9861419-0
Obfuscation or payload: unlikely
vbaProject_00.bin
42d65dd8fc37b63e03d0fbde239cf0f3f2a849bc132b18e60aca22b4fd5cc1f8		 vba-project OOXML VBA project: word/vbaProject.bin 46080 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
emf_00.emf
42df48f6fe376328d3c0f28b0601a5994fb24f047ebf9416c0bbdf24bee486b4		 ooxml-emf OOXML EMF part: word/media/image2.emf 4964 bytes

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