Rtf.Dropper.Agent-6898908-0 — RTF malware analysis

Static analysis result for SHA-256 69f44ca082ed90c9…

MALICIOUS

RTF

6.74 MB Created: 2019-02-27 23:03:00 First seen: 2019-11-20
MD5: ac0eac22ce12eac9ee15ca03646ed70c SHA-1: 6d9d9b869ad99c673a4661ff9b7318d0d68831ba SHA-256: 69f44ca082ed90c97d9c4ebaae589d7e41c69b02e582cc69886ebfd9cfb93951
404 Risk Score

Malware Insights

Rtf.Dropper.Agent-6898908-0 · confidence 95%

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

The RTF file contains multiple indicators of exploitation targeting Microsoft Equation Editor, specifically CVE-2017-11882 and CVE-2018-0798. The presence of OLE object data and excessive hex data suggests the embedding of a malicious payload. ClamAV detection as Rtf.Dropper.Agent-6898908-0 further confirms its malicious nature as a dropper.

Heuristics 12

  • 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
  • CVE-2018-0798 — Equation Editor Matrix record overflow critical CVE exact CVE_2018_0798
    RTF contains hex-encoded MTEF Matrix record exploit signature (NOP-sled 0x60 + padding 0x61 + return address 0x0BFB). CVE-2018-0798 exploits a stack buffer overflow in EQNEDT32.EXE's Matrix record parser and affected Equation Editor broadly, including builds patched for CVE-2017-11882. Widely used by APT groups (Conimes, KeyBoy, Emissary Panda, Rancor).
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • ClamAV: Rtf.Dropper.Agent-6898908-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6898908-0
  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~6503KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 4 \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.
  • 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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0063c11e.bin rtf-objdata-decoded RTF \objdata at offset 0x63C11E 87792 bytes
SHA-256: a767df27228b816f2668ee6febb786d5bc32068cae3813faa514caf6ec8ad892
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.
objdata_01_off00666f34.bin rtf-objdata-decoded RTF \objdata at offset 0x666F34 11845 bytes
SHA-256: 878601dd07ec74a303a47f3b83b936a80a010faab66529303fc4f54457e0fac1
objdata_02_off00666f63.bin rtf-objdata-decoded RTF \objdata at offset 0x666F63 35 bytes
SHA-256: d0771b17e6418e479f528fc4aa124822669975a78f8dc3e35cdc4b0f7c212c4e
objdata_03_off0066cd1a.bin rtf-objdata-decoded RTF \objdata at offset 0x66CD1A 167011 bytes
SHA-256: 46440b7979b22e1f7150802e7d3f6bbe10113c1dae213e566ba5e45d58e7da09
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.65, consistent with packed or encrypted content.

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