Office (OOXML) / .DOC malware analysis — malicious · 879fa802d7ee5491

MALICIOUS

Office (OOXML) / .DOC

247.6 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000

MD5: 9e67cc95d78ef5111adfe9b8f7af6616 SHA-1: 7fe54076d6b8f3ea03d6c988c85948857744b126 SHA-256: 879fa802d7ee5491287d0c7845cebf7d9dbf727b66b4267151f8cdffe422ba47

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is a malicious OOXML document containing VBA macros. The presence of an AutoOpen macro and a CreateObject call strongly suggests that the macros are designed to execute automatically upon opening the document. The ClamAV detection and heuristic firings indicate that this is a downloader, likely intended to fetch and run a secondary payload. No specific family could be identified, but the delivery mechanism is clear.

Heuristics 6

ClamAV: Doc.Downloader.BlueWord12213-9918951-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.BlueWord12213-9918951-0
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/drawing/2014/chartex
- 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/2012/wordml
- http://schemas.microsoft.com/office/word/2015/wordml/symex
- 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` `b1cec46e9a52c765ba03e2f8e4750462871c4dc690e02d00b4051e6043063923`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2359 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `ec1f29b9d5e80c279d85c41cbdebeebff26d965f23ab5a651d1fde1ac123bd57`	vba-project	OOXML VBA project: word/vbaProject.bin	97280 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.

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