Office (OOXML) malware analysis — malicious · 636848a11f9ce54a

MALICIOUS

Office (OOXML)

172.8 KB Created: 2020-11-17 23:53:00 UTC Authoring application: WPS Office_11.8.2.8372_F1E327BC-269C-435d-A152-05C5408002CA First seen: 2020-11-23

MD5: 6c7c99dc94bd25e8f0ee195fbd48aa22 SHA-1: 0ed770b866bd38bb4703415335e27d496acf070a SHA-256: 636848a11f9ce54abe6c80942f95e7496252697ae1cda2023f956ee04e25578e

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an OOXML document containing an embedded OLE object. This object, identified as 'Word ÏàÈÝÄ£Ê½.vbs', is a VBScript payload designed to execute. The script's purpose is to download and execute a second-stage payload, indicated by the 'OFFICE_PACKAGE_RISKY_FILE' heuristic firing. The document body contains obfuscated text and references to data manipulation, suggesting a lure for malicious activity.

Heuristics 4

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.
Suspicious extracted artifact high 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
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.microsoft.com/office/word/2010/wordprocessingCanvas In 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)
- http://www.wps.cn/officeDocument/2013/wpsCustomDataIn document text (OOXML body / shared strings)

Extracted artifacts 4

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	711680 bytes
SHA-256: `80bc5c52d40d132f0602a899be5c47a3d1e9c16835d4b85bc647c01eeb55914b`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell" ) Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	703505 bytes
SHA-256: `cadec225f4e507a69c3dd7363117d2224955b61b61c4098044f83a1e545fcc63`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell" ) Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00_ole10native_00_Word_IaEYAE12.vbs`	ole-package-payload	OOXML word/embeddings/oleObject1.bin Ole10Native payload: display_name=Word ÏàÈÝÄ£Ê½.vbs; full_path=C:\Users\lk513\AppData\Local\Temp\Word ÏàÈÝÄ£Ê½.vbs; temp_path=; def_file=	703172 bytes
SHA-256: `6ac5691aabfc14968ecc620637e6f5d2e5f1c125c48389240c4f37bb4dc86393`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). 1595 of 2904 identifiers look randomly generated (e.g. 'd5659712f356c574b762b5a5669722f6d4655712') — consistent with name-mangling obfuscation. Carved artifact contains 2309 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image3.emf	7412 bytes
SHA-256: `9efcbf30e668aa6cace5ea378ba10a6663f0b39e55310ae10cf8837f3be3a8f1`

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