Office (OOXML) / .DOC malware analysis — malicious · 558bb6eb15dcac4c

MALICIOUS

Office (OOXML) / .DOC

33.8 KB Created: 2017-05-25 19:12:00 UTC Authoring application: Microsoft Macintosh Word 14.0000

MD5: 7d96341d1d91464b990e998cb0703cb0 SHA-1: d118786757b20d954511cb75569148efbcad5688 SHA-256: 558bb6eb15dcac4cff35a953b35bd6b067df71db3d36c7b6f29f7f82fcd73fb8

440 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The AutoOpen macro and WScript.Shell usage indicate that the document attempts to execute arbitrary code. The document body explicitly prompts the user to enable macros, suggesting a social engineering lure to bypass security measures. The presence of 'macros.bas' and 'vbaProject_00.bin' further confirms the macro-based nature of the threat.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL

VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
ClamAV: Doc.Malware.Valyria-6728957-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-6728957-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
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
- http://schemas.microsoft.com/office/mac/office/2008/main
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/officeDocument/2006/math
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
- http://schemas.openxmlformats.org/wordprocessingml/2006/main
- http://schemas.microsoft.com/office/word/2010/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
- http://schemas.microsoft.com/office/word/2010/wordprocessingInk
- http://schemas.microsoft.com/office/word/2006/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `3fbc2ef94a618e17d5a6ba5af930717982f8239ff4eded5753681755be17f4ca`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `635a875e3ae07b99a521c0222d87b4cab342ce6b00fdce8cbae6e5f81dd4492f`	vba-project	OOXML VBA project: word/vbaProject.bin	15872 bytes
Detection ClamAV: Doc.Malware.Valyria-6728957-0 Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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