Ursnif Office (OLE) / .DOCX malware analysis — malicious · b4a9250c39bf5f5b

MALICIOUS

Office (OLE) / .DOCX

70.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word

MD5: 497644181af1d32fb59192288d2a3e51 SHA-1: 7f887359da688a17e9eccb770bfe4e0706d41d29 SHA-256: b4a9250c39bf5f5b9f4c63bb25bae3d9b54c4e94e8797d40925cd422c8b5e946

200 Risk Score

Malware Insights

Ursnif · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature 'Doc.Dropper.Ursnif-6864686-0'. Static analysis detected VBA macros, specifically an AutoOpen macro that executes code using Shell. This indicates the document is designed to run malicious code upon opening, consistent with Ursnif's typical behavior of downloading and executing further stages. The embedded URLs are benign and likely part of the document's structure rather than malicious infrastructure.

Heuristics 6

ClamAV: Doc.Dropper.Ursnif-6864686-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Ursnif-6864686-0
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
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.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
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/drawingml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/bibliography
- http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c56f248e9f084a2061048038c6f1e98eb6bb5edd26999980950e05dcdf451eb6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	937 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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