Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c9017de9603614a9…

MALICIOUS

RTF / .DOC

860.6 KB First seen: 2022-09-22
MD5: f54832600794ef94d95ca97c7b1d79fa SHA-1: 5de033224da5966b82d9cfcbef7c2e4a7e9b5388 SHA-256: c9017de9603614a9e3a15baaf7f090c6cd83b18d5c31d8ce940d63c383e6861b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1559.001 Component Object Model Hijacking

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 via the Equation Editor. This vulnerability is known to be used for arbitrary code execution. The embedded object's ProgID is 'Equation.3', indicating a likely exploit attempt.

Heuristics 5

  • 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.
  • 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.
  • \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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001277.bin
64533e9663bcf5131c7834312590f98a4e11a7a8fdec7746b6e7a80c68a2ef6f		 rtf-objdata-decoded RTF \objdata at offset 0x1277 81382 bytes
objdata_01_off0002ef9a.bin
8241f500b6f66c0010a61e3e66b293b7e5e246b297d9c6a44403288dc5895294		 rtf-objdata-decoded RTF \objdata at offset 0x2EF9A 140710 bytes

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