Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 905ba0fec83a0c4e…

MALICIOUS

Office (OOXML)

627.0 KB Created: 2015-07-23 04:49:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2015-08-19
MD5: 2e96311206e5915b40ee55626c1eb344 SHA-1: da63ee5d305e1893c4e843571bcdf0d40a8608f6 SHA-256: 905ba0fec83a0c4e47819c4df6684b078337c5cd2468d5419244784e4e06fdcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains an embedded OLE object that functions as a script dropper. This script is designed to download and execute a payload, identified as AdobeReader.exe. The embedded URLs suggest a mechanism for fetching additional malicious components. The document body's instruction to save the file locally further supports a phishing or social engineering pretext.

Heuristics 6

  • Ole10Native package payload is a download-and-execute script critical OFFICE_PACKAGE_SCRIPT_DROPPER
    The OLE Package's embedded payload contains a script that hosts a shell (PowerShell/WScript/mshta), fetches a remote resource, and executes it — a download-and-run dropper. Embedding such a script inside an Office document via the Object Packager is a direct user-execution delivery technique (MITRE T1204.002), not a benign attachment.
  • 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 (5 URLs) 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://ocsp.thawte.com0 Embedded OLE package script
    • http://ts-ocsp.ws.symantec.com07Embedded OLE package script
    • 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)
    • http://crl.thawte.com/ThawteTimestampingCA.crl0Embedded OLE package script
    • http://ts-aia.ws.symantec.com/tss-ca-g2.cer0Embedded OLE package script
    • http://ts-crl.ws.symantec.com/tss-ca-g2.crl0Embedded OLE package script
    • http://ts-crl.ws.symantec.com/tss-ca-g2.crl0(In 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 901632 bytes
SHA-256: e529d88f956bd8e711dba924fef96e2d075d9596bd998eef99dfde872029605d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_STR_GETPROCADDRESS, SC_STR_SHELLEXEC, SC_GETPC_CALL Static shellcode analysis recovered API/import strings: kernel32.dll, advapi32.dll, shell32.dll, KERNEL32.DLL, ADVAPI32.DLL, GetProcAddress Carved artifact entropy is 7.99, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 892027 bytes
SHA-256: be32b6799aa4fb1da5bbbc7f32ac11e2487e7a97764a4bc6ca4dec480431b111
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_STR_GETPROCADDRESS, SC_STR_SHELLEXEC, SC_GETPC_CALL Static shellcode analysis recovered API/import strings: kernel32.dll, advapi32.dll, shell32.dll, KERNEL32.DLL, ADVAPI32.DLL, GetProcAddress Carved artifact entropy is 8.00, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5128 bytes
SHA-256: db1ecd11134a20ad67046ba8206dd7b6d266fbf950ff4bb4750ed1720f55bc67

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