Win.Packed.Loki Office (OOXML) malware analysis — malicious · 828803e774a6a8a4

MALICIOUS

Office (OOXML)

440.4 KB Created: 2021-10-21 05:57:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-10-23

MD5: 978891042c401f4f06a7575d86c62533 SHA-1: 1e51fadad4f54b068a3693aec6693c78feba3ee0 SHA-256: 828803e774a6a8a421b89862344bcce0445e8f38664baa1ceea169633fb3a73a

244 Risk Score

Malware Insights

Win.Packed.Loki · confidence 95%

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a Microsoft Office document containing an embedded OLE object that is flagged as containing an executable payload. ClamAV detections indicate the packed payload is likely Win.Packed.Loki. This suggests the document is designed to exploit a vulnerability, likely CVE-2026-21514, to execute the embedded malware upon opening.

Heuristics 6

OOXML Ole10Native with payload/link indicators — possible CVE-2026-21514 high CVE likely CVE_2026_21514

Office document contains embedded OLE (word/embeddings/oleObject1.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
ClamAV: Win.Packed.Loki-10037570-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packed.Loki-10037570-0
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.openxmlformats.org/markup-compatibility/2006 In 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)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	503296 bytes
SHA-256: `d4fdc394a9b5c81e03cd42f403c2f06d7a1ec2ed6913fac509bc6adc0a7f1e91`
Detection ClamAV: Win.Packed.Loki-10037570-0 Obfuscation or payload: likely Carved artifact entropy is 7.75, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	496949 bytes
SHA-256: `aec37f7a958e41a30f7621bc767815c9d3e9090b11a0adfa66ef20c19e7c01d2`
Detection ClamAV: Win.Packed.Loki-10037570-0 Obfuscation or payload: likely Carved artifact entropy is 7.78, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5576 bytes
SHA-256: `409275941c0f1ca14b3b4d3987f57961957196185d4f61e36bff4c93d4742d3a`

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