Malicious RTF — malware analysis report

Static analysis result for SHA-256 49c1c1e06b6b582a…

MALICIOUS

RTF

195.3 KB First seen: 2019-11-20
MD5: 734acebacf0dca494f209ed2f0431ce8 SHA-1: 0f8a440944ac76dd9e2b7bd65e571c484ebc5c66 SHA-256: 49c1c1e06b6b582a844c63f771c9dfc4e0bbb1d7789e695eb5e8cf1d761fb031
220 Risk Score

Malware Insights

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

The file is an RTF document containing OLE objects and specifically triggers heuristics related to Equation Editor vulnerabilities, including CVE_2018_0802. The presence of ".objupdate" and the "ENABLE EDITING TEXT" lure indicate an attempt to activate embedded exploits. This suggests the document is designed to exploit a client-side vulnerability for code execution, likely delivered via spearphishing.

Heuristics 6

  • 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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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 4 \objdata section(s) — embedded OLE objects
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000009c.bin rtf-objdata-decoded RTF \objdata at offset 0x9C 463 bytes
SHA-256: a606c0d9b603b5ac0cfbf10571374582ec4ed88a0bf53ed361588838b19a8f99
objdata_01_off0002e1f4.bin rtf-objdata-decoded RTF \objdata at offset 0x2E1F4 4679 bytes
SHA-256: f8bfb193f9f11cf441a5c8a68b651c15a4340c7d97594e6e042cd1be19f59f20

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