Office (OOXML) malware analysis — malicious · 2482849a4f34f8a3

MALICIOUS

Office (OOXML)

75.4 KB Created: 2021-03-18 08:21:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-04-01

MD5: 1695ea8fe0fed1faa36a709d54cb2694 SHA-1: 4764057749b25109864cd9161fc716d76a860a24 SHA-256: 2482849a4f34f8a3588ead9c569dbe50388621826046e9dfa7e4ede4ac6f6bc2

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1137.001 Office Application Build T1027 Obfuscated Files or Information

The sample is a malicious Office document containing an embedded OLE object. This object, named '6666fud1.exe', is identified by ClamAV as 'Img.Dropper.PhishingLure-6329861-0' and also detected as 'Win.Packed.njRAT-10019521-0'. The presence of an embedded executable payload strongly suggests this document was intended as a spearphishing attachment to deliver malware.

Heuristics 5

ClamAV: Img.Dropper.PhishingLure-6329861-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Img.Dropper.PhishingLure-6329861-0
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Suspicious extracted artifact info 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.
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 In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	84992 bytes
SHA-256: `2e0a6cef3a2dd89163a7a9cb4a2e193602a9ce198064f07f9a5ea4b23fd5d459`
Detection ClamAV: Win.Packed.njRAT-10019521-0 Obfuscation or payload: unlikely
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	81819 bytes
SHA-256: `a5ff95e4aa46051595abc71e48db52a67083b4b21c39af22b9f36c54e324e174`
Detection ClamAV: Win.Packed.njRAT-10019521-0 Obfuscation or payload: likely Carved artifact entropy is 7.40, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00_6666fud1.exe`	ole-package-payload	OOXML word/embeddings/oleObject1.bin Ole10Native payload: display_name=6666fud1.exe; full_path=C:\Users\LORD\AppData\Local\Temp\6666fud1.exe; temp_path=; def_file=	81408 bytes
SHA-256: `95156983d6c23103451e560866c7811fceddd355e1c9c14699527d92b5b49322`
Detection ClamAV: Win.Packed.njRAT-10019521-0 Obfuscation or payload: likely Carved artifact entropy is 7.41, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5108 bytes
SHA-256: `5ce6382af0834c9bbc552f101615c794bc577fa7f001a7ed2b0f39bf74e0255c`
Detection ClamAV: Img.Dropper.PhishingLure-6329861-0 Obfuscation or payload: unlikely

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