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

Static analysis result for SHA-256 f31101d2e7ba0f20…

MALICIOUS

Office (OOXML) / .DOC

813.5 KB Created: 2021-05-13 12:16:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: a6fdcfdd4f752bddb54354262408bf82 SHA-1: 4d16b793e2b32c31691f200280ad6733325157d8 SHA-256: f31101d2e7ba0f2066102b7771d46eadbb479f267bea5495b5d2d68ed1022205
442 Risk Score

Malware Insights

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

The sample contains VBA macros with a Document_Open macro that utilizes Shell() and WScript.Shell to execute code. It also contains an embedded OLE object with indicators for CVE-2026-21514 exploitation. ClamAV detected the file and an extracted artifact as Win.Packed.Zusy-9861419-0, indicating a packed executable payload. The VBA script likely downloads and executes a second-stage payload.

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
f3605761129022a36ccc1caf14b95619a3fbd4ebea7e0719aa74e8e8b72f7e40		 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
e7b030bc2afa43227587aa5116494ca289985c88012f5df873ac0e3f53e1052c		 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
f6f1ea9c0603003d9db0232a988a3bb364fb63e3840f28a88d69f10ab766fc49		 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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