Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 71bad675cea1ec9a…

MALICIOUS

Office (OOXML)

75.4 KB Created: 2021-03-18 08:15:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-04-01
MD5: c5d4df4e839ef662b24b18589a9fdd94 SHA-1: ec63b271ea8ff4922c1b1083b297acf33083c07d SHA-256: 71bad675cea1ec9a38300e0c7cc92689660e0bf7fb982110d53690c9e9a9b568
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.

FilenameKindSourceSize
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 5124 bytes
SHA-256: f89563ec2dfbd6d262026dc064ecb89784eb69b63c3c1c72050b33e9da342956
Detection
ClamAV: Img.Dropper.PhishingLure-6329861-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.