Win.Packed.Loki Office (OOXML) malware analysis — malicious · 3a5f106633c15941

MALICIOUS

Office (OOXML)

453.6 KB Created: 2020-05-06 01:53:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-08-25

MD5: 696f48da77cb1a2c340de5f8165a9790 SHA-1: e17d0032fb00134e50cd7b5b367f25369a5838b0 SHA-256: 3a5f106633c15941529f4e9ad15788a87df18ad6ecb1d04b46b2cb47d36538d8

222 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 5

ClamAV: Win.Dropper.Nanocore-10025433-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Dropper.Nanocore-10025433-0
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 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.
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	542720 bytes
SHA-256: `cbaa8e7ac4f8311af945a40353a7ff0565d9a816af3a83682545d42cb8b53dd2`
Detection ClamAV: Win.Dropper.Nanocore-10025433-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_VIRTUALPROTECT, heap spray 0x06 Static shellcode analysis recovered API/import strings: kernel32.dll, KERNEL32.DLL, VirtualProtect Carved artifact entropy is 7.74, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	536017 bytes
SHA-256: `6a47f192bfcb56bdcab28eca613db574bc0f1e95ce8569887969a66957322410`
Detection ClamAV: Win.Dropper.Nanocore-10025433-0 Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_VIRTUALPROTECT, heap spray 0x06 Static shellcode analysis recovered API/import strings: kernel32.dll, KERNEL32.DLL, VirtualProtect Carved artifact entropy is 7.73, consistent with packed or encrypted content.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5508 bytes
SHA-256: `8dea4e02aad091784435cb62bac317e3662eed30daf41f9fdb2ab595969f6576`

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