Malicious RTF — malware analysis report

Static analysis result for SHA-256 a16cb18857bed36c…

MALICIOUS

RTF

15.9 KB First seen: 2019-12-09
MD5: c3a70d2bf53f2eb6d05cafbb5e640855 SHA-1: 957538ca1a87ce6cbf4f840777c032811d82bf55 SHA-256: a16cb18857bed36c0cdead4fcb8b9785aae626729a3b41b542afa15ae0fdda5f
222 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to facilitate arbitrary code execution. The embedded URL suggests a secondary payload download, a common technique for this type of exploit.

Heuristics 7

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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://91.243.80.200/P In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001db.bin rtf-objdata-decoded RTF \objdata at offset 0x1DB 7840 bytes
SHA-256: 71dbd995a5d0c93390ebfc0e4b15840756097b0aa86279d35dde922668bb0915

Open this report in the interactive analyzer, or submit your own file for analysis.