Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8524dbd847d9d4d2…

MALICIOUS

RTF / .DOC

1.96 MB
MD5: 26ebf7249be78396f39d2109f24a8ff4 SHA-1: 6ae509e9824ea44832dc1ed9d1c1c23579e3de37 SHA-256: 8524dbd847d9d4d2880c9a5a410b0f1b60ba12e0d8df70b5366c37fca5f2a0cb
180 Risk Score

Malware Insights

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

The file is an RTF document containing embedded OLE objects, specifically triggering critical heuristics related to Equation Editor and CVE-2017-11882. The ".objupdate" directive forces OLE activation, indicating an attempt to exploit this vulnerability. The embedded object's ProgID is 'Equation.3', which is a strong indicator of this exploit. The decoded object data appears to contain obfuscated script-like content, likely intended to download and execute a second-stage payload.

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_off00001116.bin
9719877e4bf6384d459e66f26214ecfbc27f20115f04184eeab0e7ab6e1cc5aa		 rtf-objdata-decoded RTF \objdata at offset 0x1116 25616 bytes
objdata_01_off000191fd.bin
ac9bfb081d4e3f91c1d530b09d33124ea631b81e03f3efc0b3eee9f29b094bb3		 rtf-objdata-decoded RTF \objdata at offset 0x191FD 463381 bytes

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