Malicious RTF — malware analysis report

Static analysis result for SHA-256 3439d290fc51aced…

MALICIOUS

RTF

778.0 KB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: fb7f94316be42ae786fd1c74946e6be2 SHA-1: b0227de561ff128c40d91fa006945089784a98b0 SHA-256: 3439d290fc51acedbad802bdd35ffd95acb2d9585541eb941ee195951ee31ec7
182 Risk Score

Malware Insights

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

The RTF document contains an OLE object that is activated via \objupdate, triggering the CVE-2017-8759 vulnerability. This exploit is commonly used to download and execute a second-stage payload. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the payload is likely an encrypted archive requiring a password, a common tactic to bypass security filters.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000b7ebe.bin rtf-objdata-decoded RTF \objdata at offset 0xB7EBE 1413 bytes
SHA-256: b72e3b290298037b977134e89fa8ab60591972691b06c2f245f313f8d1fa949c

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