Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e5704da291c57b35…

MALICIOUS

RTF / .DOC

5.68 MB First seen: 2022-05-09
MD5: 4d0717055b3fc09fa51907612eafaa08 SHA-1: cd7fa4bb27c9c4f62ae41e31bb94a58768324fb3 SHA-256: e5704da291c57b35422e3b096323b84cc43f2ef4fc93c1db7bdb51e6eb29cbb5
220 Risk Score

Malware Insights

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

The RTF document contains critical heuristic firings indicating the exploitation of CVE-2017-11882 through embedded OLE object data, specifically related to the Equation Editor. The presence of large amounts of hex-encoded data within OLE object sections suggests a hidden payload. The attack pattern is consistent with exploiting this known vulnerability to execute arbitrary code, likely leading to the download and execution of further malicious content.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~5947KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001144.bin
b95773bae4327e38ef3e90798020848f250218f373b4cbb23ecbd9375dd3a4d6		 rtf-objdata-decoded RTF \objdata at offset 0x1144 2973969 bytes

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