Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 59f396526580f827…

MALICIOUS

Office (OOXML)

11.0 KB Created: 2017-11-17 10:35:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2017-11-20
MD5: e193adeac64fea237e0777f1188b01bc SHA-1: 630c334343363902fa16507b3b812d554b0e41a1 SHA-256: 59f396526580f8277ae79671bf7b70904a4a0e93012e9477f4eca217eacc7a37
142 Risk Score

Malware Insights

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

The sample leverages a malicious DDE command embedded within the document body to execute a command-line interpreter. This command then uses PowerShell to download a second-stage payload from 'http://b7center.com/bagratios.png' and save it as '%TMP%\jkh.exe', which is subsequently executed. The execution chain is further orchestrated via a batch file '%TMP%\rtu.bat'.

Heuristics 4

  • Malicious DDE command critical OOXML_DDE_MALICIOUS
    DDE field in word/document.xml launches a dangerous executable: \\system32\\cmd.exe
  • Word field-chain (SET/REF) co-located with DDE high OOXML_FIELD_SET_REF_CHAINING
    2 SET/REF variable pair(s) co-occur with DDE field(s) in word/document.xml
  • 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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