Jrat — Office (OOXML) malware analysis

Static analysis result for SHA-256 41d5e00b7e41ad3f…

MALICIOUS

Office (OOXML)

399.5 KB Created: 2017-06-01 19:04:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2017-06-12
MD5: 0de07fa3e3fd23f460368753cc7b0042 SHA-1: e8921d0055ac86241c14d99b4108cb29bd369088 SHA-256: 41d5e00b7e41ad3f74319bc2e16be685e8702c27df246bf06abd4cf1126135ed
224 Risk Score

Malware Insights

Jrat · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This OOXML document contains an embedded OLE object that is flagged as a risky file type, capable of dropping an auto-executable payload. ClamAV detections confirm this, identifying it as 'Doc.Downloader.Jrat-6336393-1'. The embedded object likely facilitates the execution of a second-stage payload, indicated by the URL http://www.netmastersllc.com.

Heuristics 6

  • ClamAV: Doc.Downloader.Jrat-6336393-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Jrat-6336393-1
  • 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://www.netmastersllc.com In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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/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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 718336 bytes
SHA-256: a58a4e2873246de64241adb6424b7f43d7a9c25c01826b65994682f52455cf31
Detection
ClamAV: Doc.Downloader.Jrat-6336393-1
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_MSF_REVERSE, SC_STR_VIRTUALALLOC, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryExA, VirtualAlloc, GetProcAddress, ExitProcess, kernel32.dll, KERNEL32.DLL
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 710528 bytes
SHA-256: cff46abde7501a451fa9d81ad835c4baeea0174edd03df50679896dab4efe2db
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_MSF_REVERSE, SC_STR_VIRTUALALLOC, SC_STR_LOADLIBRARY Static shellcode analysis recovered API/import strings: LoadLibraryExA, VirtualAlloc, GetProcAddress, ExitProcess, kernel32.dll, KERNEL32.DLL
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5420 bytes
SHA-256: 8649855b8ec329bf288380bea12028d6e6b18bc51699d05560432940984818fa

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