Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f611ba47d87c22dd…

MALICIOUS

RTF / .DOC

1.01 MB
MD5: a88d7e7e4c06bf6929da0280b998f0b7 SHA-1: 829bab50ef5e7f18f5f0c9413863f3b1675ee1b1 SHA-256: f611ba47d87c22dda81b81909d4eab3a4c2cf51e495459c262dd3b51e42b11a2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code when the embedded object is activated. No further stages or specific IOCs were extracted from this sample.

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_off00000f58.bin
b71442315e0498e9d17869d2f1073788520d9ca99f6c7d9f4bb27f0e28cfb08e		 rtf-objdata-decoded RTF \objdata at offset 0xF58 49000 bytes
objdata_01_off0002a9d7.bin
faaa23976e44b1147dfaf4bfbddc4554674728770dee43f10bab0d524243535b		 rtf-objdata-decoded RTF \objdata at offset 0x2A9D7 217076 bytes

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