Rtf.Dropper.Agent-7122093-0 — RTF malware analysis

Static analysis result for SHA-256 9dd93389e2e1e877…

MALICIOUS

RTF

1.69 MB Created: 2018-07-31 23:59:00 Authoring application: Riched20 6.3.9600 First seen: 2019-09-30
MD5: 0d894ca1e7ba1d3858b4c088b15c0899 SHA-1: f2f9a9886aed909cd91f89b7328860777da2dbce SHA-256: 9dd93389e2e1e87718c1e51ff978b843cd6dff91899cd67a1c8eef82c5c27b2a
382 Risk Score

Malware Insights

Rtf.Dropper.Agent-7122093-0 · confidence 95%

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

The RTF file contains multiple OLE objects, including a package object and excessive hex data, indicative of a dropper. Critical heuristics identify the exploitation of CVE-2017-8759 via MSXML SAX OLE activation, a known vulnerability used to execute arbitrary code. The embedded URL suggests a potential download location for a secondary payload.

Heuristics 11

  • 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-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.
  • ClamAV: Rtf.Dropper.Agent-7121614-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7121614-0
  • \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 ~1669KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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
  • 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 medium 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://lis.ly.gov.tw In RTF body
    • https://lis.ly.gov.tw}{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_off0001448a.bin rtf-objdata-decoded RTF \objdata at offset 0x1448A 829755 bytes
SHA-256: f27900397698a469cdc01c0eeae62f347a753e9a90044a1ff43f7cb02b9dcc8b
objdata_01_off001a9a1c.bin rtf-objdata-decoded RTF \objdata at offset 0x1A9A1C 4141 bytes
SHA-256: 43293cfbc5a7e250316e7ed8fa3914519dff68e32237655197644bb7b8d33557
objdata_02_off001abd7b.bin rtf-objdata-decoded RTF \objdata at offset 0x1ABD7B 7154 bytes
SHA-256: b76f0fb379bb66926e2bf56673f236d810ca0b0674b094a8090ac4ede1605c3e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled

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