Office (OOXML) / .DOC malware analysis — malicious · 8e7d5ac402338bb1

MALICIOUS

Office (OOXML) / .DOC

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

MD5: 1a64434b1c585a5d2880173312487bbd SHA-1: 4c3b3df0e07838a3ab832c6c7c5abfc5109de6ad SHA-256: 8e7d5ac402338bb17b73292bed75101dfa06ca7fc75082de125fc02052693a89

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.BlueWord-9845926-0', indicating it functions as a downloader. Static analysis revealed the presence of VBA macros, specifically an 'AutoOpen' macro, which is designed to execute automatically. This macro likely uses the 'CreateObject' call to download and execute a second-stage payload, aligning with the downloader classification. No specific malware family could be confidently identified, but the technique suggests a common delivery mechanism for malware.

Heuristics 7

ClamAV: Doc.Downloader.BlueWord-9845926-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.BlueWord-9845926-0
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/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` `24d56e7cb6c0f43132ff8d4c249bac6c023e0af8cc1a8cc1c2805e211fc1445b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2193 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` `e953959e7df7a6755115a28358c03164c8846f2bba3f56098c6871dab2f57b02`	vba-project	OOXML VBA project: word/vbaProject.bin	99328 bytes
Detection ClamAV: Doc.Downloader.BlueWord-9845926-0 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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