Malicious RTF — malware analysis report

Static analysis result for SHA-256 5bbf2643a601e632…

MALICIOUS

RTF

216.8 KB Created: 2019-12-24 10:28:00 First seen: 2020-05-25
MD5: 95bec02acfdf30a308fb1aa9492f885a SHA-1: 51025bca7dc14abe519591b435f4bf9170470826 SHA-256: 5bbf2643a601e632a49406483c8fc5262a76e206bd969f2ba3f4f2e238768ab9
144 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects, with a critical heuristic indicating exploitation of CVE-2017-8759. This vulnerability allows for the activation of OLE objects, likely to execute a malicious payload. The presence of an embedded URL suggests a potential download or redirection to a malicious site. The document body appears to be a lure related to a conference, which is a common tactic for spearphishing attachments.

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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact info 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.
  • 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 https://expomap.ru/conference/aerospace-defense-supplier-summit-seattle-2020/ In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000e970.bin rtf-objdata-decoded RTF \objdata at offset 0xE970 73968 bytes
SHA-256: d52c04b7202dea3ddc48846f692adb5c2c5f11c0a3970209fbd5789c575ace4e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
objdata_01_off00032b76.bin rtf-objdata-decoded RTF \objdata at offset 0x32B76 6847 bytes
SHA-256: e41db3b920b97d35fee7cad90d8e442e95f33a22b8414d5819876e58889c49d7
objdata_02_off00032b90.bin rtf-objdata-decoded RTF \objdata at offset 0x32B90 6843 bytes
SHA-256: cbf708629437999ba26cf021c20424245fb880bd6c399adc3aa83dd2b149b130

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