Malicious RTF — malware analysis report

Static analysis result for SHA-256 2ce818e435137213…

MALICIOUS

RTF

1.63 MB
MD5: be53833b7b9c8a16d5d90e25af26e0c5 SHA-1: 78e99a0ce9f45eb1edbace4d38ed43253df01e98 SHA-256: 2ce818e435137213162003e2aaa89a4bdbb67ba9416283c3646d84d5393d685b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample is an RTF document containing embedded OLE objects and the Equation.3 ProgID, which is specifically associated with CVE-2017-11882 and CVE-2018-0802. The presence of the \objupdate control word forces automatic activation of the exploit, bypassing user interaction. No scripts were extracted from this sample, but the binary OLE objects are designed to trigger the memory corruption vulnerability in the Equation Editor component.

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_off000011e1.bin
40262fe4f4943ece0d9bb6440c413bb38ae9a7e28bb1b41972d1d5b5218e3855		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 53907 bytes
objdata_01_off0002fa8d.bin
0a0103f81ecaf6eb904befe7f328952354a33a6d49f64b01ead02ee216cb69c4		 rtf-objdata-decoded RTF \objdata at offset 0x2FA8D 410074 bytes

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