Malicious RTF — malware analysis report

Static analysis result for SHA-256 7c66e3156bbe88ec…

MALICIOUS

RTF

2.96 MB Created: 2024-04-03 08:46:00 First seen: 2025-02-18
MD5: 19ac38b2e44d149859664387297f21c3 SHA-1: 4b8dd163f27e2e404009bcf7a286ca06c7b4fed7 SHA-256: 7c66e3156bbe88ec56294cd2ca15416dd2b18432deedc024116ea8fbb226d23b
282 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The RTF file contains multiple indicators of exploitation, specifically related to CVE-2017-11882 through the Equation Editor OLE object. The presence of PE headers within hex data and OLE object data strongly suggests the embedded object is a malicious executable. The file's structure and heuristic firings point towards a classic exploit delivery mechanism.

Heuristics 8

  • 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.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://ocsp.entrust.net00
    • http://ocsp.entrust.net05
    • http://ocsp.digicert.com0C
    • http://ocsp.digicert.com0A
    • http://ocsp.digicert.com0X
    • http://schemas.microsoft.com/office/word/2003/wordml
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://crl.entrust.net/g2ca.crl0
    • http://www.entrust.net/rpa0
    • http://aia.entrust.net/ovcs1-chain256.cer01
    • http://crl.entrust.net/ovcs1.crl0J
    • http://cacerts.digicert.com/DigiCertAssuredIDRootCA.crt0E
    • http://crl3.digicert.com/DigiCertAssuredIDRootCA.crl0
    • http://cacerts.digicert.com/DigiCertTrustedRootG4.crt0C
    • http://crl3.digicert.com/DigiCertTrustedRootG4.crl0
    • http://crl3.digicert.com/DigiCertTrustedG4RSA4096SHA256TimeStampingCA.crl0��
    • http://cacerts.digicert.com/DigiCertTrustedG4RSA4096SHA256TimeStampingCA.crt0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003a12.bin
cacb9a4f766164021b03503c328e8b1e0c6cf3cf6bd7f1aa1888d5088a3b09e6		 rtf-objdata-decoded RTF \objdata at offset 0x3A12 486898 bytes
objdata_01_off000fce28.bin
504c196a6b81b13ae02ea816040e5535599b2ea4ebd9c482620505d503be1699		 rtf-objdata-decoded RTF \objdata at offset 0xFCE28 361477 bytes

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