Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8c95e7c821e82d89…

MALICIOUS

RTF / .DOC

20.2 KB
MD5: 6cd99fce540c9c71476b17cee7213f00 SHA-1: 52679566b6966c13df2dd3e892b3a40b9b77e12f SHA-256: 8c95e7c821e82d891eab0ec695482f64fdb5efba3582fcf9cc5e2e657f2ef5e5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF file contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics indicates the file is designed to exploit this known vulnerability. The RTF_OBJUPDATE heuristic suggests that the embedded object is forced to activate, leading to arbitrary code execution. The primary attack vector is likely spearphishing attachment, leveraging the embedded exploit.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001877.bin
0a22f0f7078be572228e1d2e47d136c601b8e284682740610d544c18d9db1d5d		 rtf-objdata-decoded RTF \objdata at offset 0x1877 1577 bytes

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