Office (OOXML) / .DOC malware analysis — malicious · bd9b8fe173935ad5

MALICIOUS

Office (OOXML) / .DOC

139.8 KB Created: 2021-11-15 15:39:00 UTC Authoring application: Microsoft Office Word 12.0000

MD5: 13b09350d8748cce048dfae731a2092f SHA-1: f9d299ce03804bb0d4065f49a07b31cdada55680 SHA-256: bd9b8fe173935ad51f14abc16ed6a5bf6ee92ec4f45fd2ae1154dd2f727fb245

382 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a VBA macro with a Document_Open subroutine, indicating automatic execution upon opening. The macro utilizes WScript.Shell and CreateObject to execute a command. The script attempts to download a payload from the URL "http://visteme.mxc/shop/wp-admin/PP/" using a reconstructed command string. This indicates a downloader or droppper functionality.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Doc.Malware.Valyria-10033907-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Malware.Valyria-10033907-0
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.
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.openxmlformats.org/markup-compatibility/2006
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/officeDocument/2006/math
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
- http://schemas.openxmlformats.org/wordprocessingml/2006/main
- http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d5a25b7bf0ccedb249c27ef36e62fa12ba8e2ff73f7114a3a1f9f528858c345b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3999 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` `363cc56518c1ab4e57c95cd5856bb1d8d92fb4edf17955eb624d6e0e018da662`	vba-project	OOXML VBA project: word/vbaProject.bin	16896 bytes
Detection ClamAV: Doc.Malware.Valyria-10033907-0 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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