Ursnif — Office (OLE) / .DOCX malware analysis

Static analysis result for SHA-256 2979b5fbb454e2f1…

MALICIOUS

Office (OLE) / .DOCX

81.0 KB Created: 2018-04-19 18:59:00 Authoring application: Microsoft Office Word
MD5: 4443840f2870c2cd55062bdcab07e5fd SHA-1: 61911e604362338b0f9c91c4aa69696a88dad62f SHA-256: 2979b5fbb454e2f13d89e58177f8c1f881bd3f0a0bebb1d27da9e189ba9d284e
240 Risk Score

Malware Insights

Ursnif · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV with the signature Doc.Dropper.Ursnif-6864686-0. Static analysis revealed VBA macros, including an AutoOpen macro, that reference cmd.exe. This indicates the macro is designed to execute commands, likely for downloading and executing a secondary payload, a common behavior for Ursnif droppers.

Heuristics 7

  • 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
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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.

FilenameKindSourceSize
macros.bas
189a6749bc11698e046d68851c7e405b351110e2c48ff7057594a6b76d063ae7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5903 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 78 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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