Office (OOXML) / .DOC malware analysis — malicious · 16f094c357add367

MALICIOUS

Office (OOXML) / .DOC

55.4 KB Created: 2020-06-16 23:43:00 UTC Authoring application: Microsoft Office Word 14.0000

MD5: f002fbc8ec72533c14c472759c62a49c SHA-1: fa3f5c6a4ad606b5b0beddaa43e8144b7dbcad8f SHA-256: 16f094c357add367d6209ccc5a28116c790baef3a97c50404a6fb1a619995658

324 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with a Document_Open auto-execution trigger. This macro decodes and executes a command that creates a VBScript file. This script then downloads a second-stage executable from 'http://fgs.elpadrino.xyz:2095/ench/2.exe' and saves it as 'C:\ProgramData\WxByN.exe'. The use of Shell() and CreateObject() calls within the VBA macro, along with the Base64-decoded command, strongly indicates a downloader pattern.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.
ClamAV: Doc.Dropper.Generic-9823774-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Generic-9823774-0
Document_Open macro high OLE_VBA_DOCOPEN

Document_Open 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
Suspicious extracted artifact info 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.
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://fgs.elpadrino.xyz:2095/ench/2.exe
- 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `e0e6ac6945a34676da5f282f7d00403571dccbd3a5bd2590cc67b873c500e95e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3221 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`vbaProject_00.bin` `b505dc6be6f142f5f0276076d1151e100df9b6556b7584f4f5c66831f34ce946`	vba-project	OOXML VBA project: word/vbaProject.bin	12288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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