Office (OOXML) / .DOC malware analysis — malicious · 071207d36467fe34

MALICIOUS

Office (OOXML) / .DOC

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

MD5: be0efa4c2c6e815b49749a21186f6660 SHA-1: f821158b7b9ffe88e9c5e55c910b5bf45609093f SHA-256: 071207d36467fe346209d513ffa7366491479b6af4592d5ed43efdbf6007dbbe

442 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The sample is a malicious OOXML document containing VBA macros. The AutoOpen macro attempts to decode a base64 string from the document properties and execute it. For Windows, it writes the decoded content to a temporary executable file and runs it using WScript.Shell. For macOS, it pipes the decoded content to Python for execution. This indicates a downloader or dropper functionality.

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
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — 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://www.motobit.com
- http://Motobit.cz
- 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
`vbaProject_00.bin` `635a875e3ae07b99a521c0222d87b4cab342ce6b00fdce8cbae6e5f81dd4492f`	vba-project	OOXML VBA project: word/vbaProject.bin	15872 bytes
Detection ClamAV: Doc.Malware.Valyria-6728957-0 Obfuscation or payload: unlikely

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