Malicious RTF — malware analysis report

Static analysis result for SHA-256 124860a0bd6f552b…

MALICIOUS

RTF

2.97 MB Created: 2024-04-03 08:46:00 First seen: 2025-01-29
MD5: a968cbe5109f74df8e13efd3fb8c9d0b SHA-1: 5237dc0b3c87aad57cedb9f573f243c62d8bd684 SHA-256: 124860a0bd6f552b7d10182e6c8c7265b7843b59387a7157abb82a004bd985a7
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 for CVE-2017-11882, including OLE objects and a specific Equation Editor ProgID. The presence of PE headers within hex data strongly suggests the embedded OLE object is a loader for a secondary executable payload. The document body content is irrelevant and appears to be font metadata.

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
219358200cc975875e7facbe2c2d44167d8468e5427052e1b85dd532b155b604		 rtf-objdata-decoded RTF \objdata at offset 0x3A12 491506 bytes
objdata_01_off000ff228.bin
9b8097da313e3b118489e69dd26bc290089e5005fe766c169f4f63429fd2a50a		 rtf-objdata-decoded RTF \objdata at offset 0xFF228 362691 bytes

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