Malicious RTF — malware analysis report

Static analysis result for SHA-256 5187c9a84f5e69ba…

MALICIOUS

RTF

470.1 KB Created: 2018-10-14 19:52:00 First seen: 2020-05-25
MD5: 23dad71a3a55208d944c822c627d1a56 SHA-1: ae042ec91ac661fdc0230bdddaafdc386fb442a3 SHA-256: 5187c9a84f5e69ba4b08538c3f5e7432e7b45ac84dec456ea07325ff5e94319a
442 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of exploitation, including RTF_EQUATION_EDITOR, CVE_2017_11882_ACTIVATION_RELATED, and RTF_MZ_HEX, indicating the presence of a PE executable within an OLE object. ClamAV detections confirm this, identifying the file as Win.Trojan.Panda-7679562-2. The embedded OLE object is likely a trojan designed to be executed by exploiting a vulnerability in the Equation Editor. The document body content appears to be unrelated political text, likely a lure.

Heuristics 10

  • 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
  • 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.
  • ClamAV: Win.Trojan.Panda-7679562-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Panda-7679562-2
  • 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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body
    • http://www.netscape.com/newsref/std/cookie_spec.htmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000150f3.bin rtf-objdata-decoded RTF \objdata at offset 0x150F3 163613 bytes
SHA-256: 3a51be8994c03f207e5d6b541b62ad95f0ca761e074815e19584b1461e80e88c
Detection
ClamAV: Win.Trojan.Panda-7679562-2
Obfuscation or payload: unlikely
objdata_01_off00070f78.bin rtf-objdata-decoded RTF \objdata at offset 0x70F78 8643 bytes
SHA-256: 67b71d85c907bade85c47b53c375a804398aae68b3508a4e0b9a102b2f326e65

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