Office (OOXML) / .DOCX malware analysis — malicious · 2b6dc1a826a4d5d5

MALICIOUS

Office (OOXML) / .DOCX

775.2 KB Created: 2018-12-31 02:40:00 UTC Authoring application: Microsoft Office Word 14.0000

MD5: 1f1f44a01d5784028302d6ad5e7133aa SHA-1: cb1125d5a57a529bf88bf590c0cb675f37261839 SHA-256: 2b6dc1a826a4d5d5de5a30b458e6ed995a4cfb9cad8114d1197541a86905d60e

420 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros, specifically triggering AutoOpen and Document_Open, which are designed to execute shell commands. This behavior, combined with ClamAV detections of 'Doc.Dropper.Agent-6873191-0', strongly indicates the document is a dropper intended to download and execute a second-stage payload. The presence of CreateObject and LOLBin references further supports malicious intent.

Heuristics 10

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
LOLBin reference in VBA critical OLE_VBA_LOLBIN

LOLBin reference in VBA
ClamAV: Doc.Dropper.Agent-6873191-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6873191-0
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
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open 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.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
- http://schemas.openxmlformats.org/officeDocument/200

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `165603348cb5be02538eebb87c8e9c259d9170aaee925365d5bced6401bcda20`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3998 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` `6d065b14f2c9180cdfb606ddafca762fd1dc1423c360eee6d6583ac646a9ab66`	vba-project	OOXML VBA project: word/vbaProject.bin	26624 bytes
Detection ClamAV: Doc.Dropper.Agent-6873191-0 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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