Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 31e13d5df0697336…

MALICIOUS

Office (OOXML)

74.5 KB Created: 2017-08-14 22:09:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2018-02-07
MD5: 9de7fa8ae2f2814137dec6660b8e68eb SHA-1: a872137df5e626ec35555f06157dfaff7136d420 SHA-256: 31e13d5df0697336986457176df758c47cd455de2c68adcf1a841cae1977556e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The sample is a malicious Office document containing an embedded OLE object. This object is identified as a package that drops an auto-executable payload, indicated by the 'jse' extension. The heuristic 'OOXML_EMBEDDED_OBJECT_URL' specifically recovered the URL 'http://ornekka', which is likely the source or destination for the dropped payload. This suggests the document is designed to trick the user into opening it, leading to the execution of a secondary malicious file.

Heuristics 5

  • 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 medium 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.
  • Payload URL recovered from embedded OLE object (1 URL) info OOXML_EMBEDDED_OBJECT_URL
    An embedded OLE object (xl/word/ppt embeddings) carries a next-stage download URL in its Ole10Native/Package stream — stored literally (incl. UTF-16) or base64-encoded — which the package-level URL sweep does not see. Surfaced as an IOC; self-validating (only real payload hosts).
  • 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://ornekka In 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.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/2006/wordmlIn document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://www.iec.chIn document text (OOXML body / shared strings)

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 9216 bytes
SHA-256: 4b86888c6ecdaafbbc056727087011821fd871dfb87c9a27be951e9b594fae67
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s).
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 5794 bytes
SHA-256: 7d8fcea8cd161fce94a1d74bf99980dffd78003da3d55210ed10fd0987dba837
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s).
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject2.bin 9216 bytes
SHA-256: 068c50cb8eb040478c07a007c307d2344be6ac27a4b67af91ccd5bac78813bd9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s).
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5196 bytes
SHA-256: b7e3640d6ee9df006c42b20011f3453d3017a29bdac7ceae57b3064e9af7a449
emf_01.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5196 bytes
SHA-256: 4872fc5531508883b894254b2970250c723c740a5a1bdef4892892c42a24e324

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