Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0073e2575ba9324d…

MALICIOUS

Office (OOXML)

10.8 KB Created: 2017-11-17 10:35:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2017-11-20
MD5: ba76e2181256bfbef9e57e6b9534e2a0 SHA-1: 0a58ed0bd88780e98aa65aa57b15c7009139f63f SHA-256: 0073e2575ba9324db103bf2aab839eb0823b179ebb634220a1e31a1c551539d3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample contains a critical DDE command that executes cmd.exe. This command uses PowerShell to download a file from 'http://b7center.com/bagratios.png' to '%TMP%\jkh.exe' and then executes it. The script also creates a batch file '%TMP%\rtu.bat' which is then executed, indicating a multi-stage infection process. The DDE execution and PowerShell usage are strong indicators of malicious intent.

Heuristics 4

  • ClamAV: Doc.Exploit.DDEautoexec-6361400-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.DDEautoexec-6361400-2
  • Malicious DDE command critical OOXML_DDE_MALICIOUS
    DDE field in word/document.xml launches a dangerous executable: \\system32\\cmd.exe
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://b7center.com/bagratios.png In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)

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