Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9cb8b4cf14224c41…

MALICIOUS

Office (OOXML)

25.0 KB Created: 2018-01-19 18:41:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-09-30
MD5: 6570ab8599bc6c876976fd680cb51c51 SHA-1: 23ba12747ddcf265f84b82384f44a86d86b27c01 SHA-256: 9cb8b4cf14224c41cde1ff0264b4e69d9530d0837c66f52b0df5b11c037139cb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains a critical DDE heuristic firing indicating a malicious command. This command is further detailed in the document body, revealing a PowerShell command that downloads a file from 'https://dl.dropboxusercontent.com/s/4va1sylr5ru0w6/init.txt?dl=0' and saves it as 'init.ps1' in the temporary directory, which is then executed. This indicates the document is a malicious attachment designed to download and execute a second-stage payload.

Heuristics 5

  • Malicious DDE command critical OOXML_DDE_MALICIOUS
    DDE field in word/document.xml launches a dangerous executable: powershell
  • 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.
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://ckattrans.spb.ru/
  • 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 In 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)
    • http://ckattrans.spb.ru/Document hyperlink
    • https://spb.hh.ru/employer/600756Document hyperlink
    • https://spb.hh.ru/employer/995956Document hyperlink

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